Chicxulub crater

The Chicxulub crater (IPA: [tʃikʃuˈlub] ⓘ) is an impact crater buried underneath the Yucatán Peninsula in Mexico. Its center is offshore, but the crater is named after the onshore community of Chicxulub Pueblo.[3] It was formed slightly over 66 million years ago when a large asteroid, about ten kilometers (six miles) in diameter, struck Earth. The crater is estimated to be 180 kilometers (110 miles) in diameter and 20 kilometers (12 miles) in depth. It is the second largest confirmed impact structure on Earth, and the only one whose peak ring is intact and directly accessible for scientific research.[4]

"Chicxulub" redirects here. For other uses, see Chicxulub (disambiguation).

Chicxulub crater
Chicxulub impact structure
Imaging from NASA's Shuttle Radar Topography Mission STS-99 reveals part of the diameter ring of the crater in the form of a shallow circular trough. Numerous cenotes (sinkholes) cluster around the trough marking the inner crater rim.[1]
Impact crater/structure
ConfidenceConfirmed
Diameter180 km (110 mi)
Depth20 km (12 mi)
Impactor diameter10 km (6.2 mi)
Age66.043 ± 0.043 Ma
Cretaceous–Paleogene boundary[2]
ExposedNo
DrilledYes
Bolide typeCM or CR type carbonaceous chondrite
Location
Coordinates21°24′0″N 89°31′0″W
CountryMexico
StateYucatán
Chicxulub crater is located in North America
Chicxulub crater
Chicxulub crater
Location of Chicxulub crater
Chicxulub crater is located in Mexico
Chicxulub crater
Chicxulub crater
Chicxulub crater (Mexico)

The crater was discovered by Antonio Camargo and Glen Penfield, geophysicists who had been looking for petroleum in the Yucatán Peninsula during the late 1970s. Penfield was initially unable to obtain evidence that the geological feature was a crater and gave up his search. Later, through contact with Alan R. Hildebrand in 1990, Penfield obtained samples that suggested it was an impact feature. Evidence for the crater's impact origin includes shocked quartz, a gravity anomaly, and tektites in surrounding areas.[3]

The date of the impact coincides with the Cretaceous–Paleogene boundary (commonly known as the K–Pg or K–T boundary). It is now widely accepted that the resulting devastation and climate disruption was the cause of the Cretaceous–Paleogene extinction event, a mass extinction of 75% of plant and animal species on Earth, including all non-avian dinosaurs.[4]

Discovery

In the late 1970s, geologist Walter Alvarez and his father, Nobel Prize-winning scientist Luis Walter Alvarez, put forth their theory that the Cretaceous–Paleogene extinction was caused by an impact event.[5][6] The main evidence of such an impact was contained in a thin layer of clay present in the Cretaceous–Paleogene boundary (K–Pg boundary) in Gubbio, Italy. The Alvarezes and colleagues reported that it contained an abnormally high concentration of iridium, a chemical element rare on Earth but common in asteroids.[5][7] Iridium levels in this layer were as much as 160 times above the background level.[8] It was hypothesized that the iridium was spread into the atmosphere when the impactor was vaporized and settled across Earth's surface among other material thrown up by the impact, producing the layer of iridium-enriched clay.[9] At the time, there was no consensus on what caused the Cretaceous–Paleogene extinction and the boundary layer, with theories including a nearby supernova, climate change, or a geomagnetic reversal.[8]: 1095  The Alvarezes' impact hypothesis was rejected by many paleontologists, who believed that the lack of fossils found close to the K–Pg boundary—the "three-meter problem"—suggested a more gradual die-off of fossil species.[6][10]

The Alvarezes, joined by Frank Asaro and Helen Michel from University of California, Berkeley, published their paper on the iridium anomaly in Science in June 1980.[8] Their paper was followed by other reports of similar iridium spikes at the K–Pg boundary across the globe, and sparked wide interest in the cause of the K–Pg extinction; over 2,000 papers were published in the 1980s on the topic.[10]: 82 [11] There were no known impact craters that were the right age and size, spurring a search for a suitable candidate.[6] Recognizing the scope of the work, Lee Hunt and Lee Silver organized a cross-discipline meeting in Snowbird, Utah, in 1981. Unknown to them, evidence of the crater they were looking for was being presented the same week, and would be largely missed by the scientific community.[10]: 83–84 [11]

A painting depicting the asteroid impacting Earth, creating the Chicxulub crater
Artistic impression of the asteroid slamming into tropical, shallow seas of the sulfur-rich Yucatán Peninsula in what is today Southeast Mexico.[12] The aftermath of this immense asteroid collision, which occurred approximately 66 million years ago, is believed to have caused the mass extinction of non-avian dinosaurs and many other species on Earth.[12] The impact spewed hundreds of billions of tons of sulfur into the atmosphere, producing a worldwide blackout and freezing temperatures which persisted for at least a decade.[12]

In 1978, geophysicists Glen Penfield and Antonio Camargo were working for the Mexican state-owned oil company Petróleos Mexicanos (Pemex) as part of an airborne magnetic survey of the Gulf of Mexico north of the Yucatán Peninsula.[13]: 20–1  Penfield's job was to use geophysical data to scout possible locations for oil drilling.[5] In the offshore magnetic data, Penfield noted anomalies whose depth he estimated and mapped. He then obtained onshore gravity data from the 1940s. When the gravity maps and magnetic anomalies were compared, Penfield described a shallow "bullseye", 180 km (110 mi) in diameter, appearing on the otherwise non-magnetic and uniform surroundings—clear evidence to him of an impact feature.[5][3] A decade earlier, the same map had suggested a crater to contractor Robert Baltosser, but Pemex corporate policy prevented him from publicizing his conclusion.[13]: 20 

Penfield presented his findings to Pemex, who rejected the crater theory, instead deferring to findings that ascribed the feature to volcanic activity.[3] Pemex disallowed release of specific data, but let Penfield and Camargo present the results at the 1981 Society of Exploration Geophysicists conference.[11] That year's conference was under-attended and their report attracted scant attention, with many experts on impact craters and the K–Pg boundary attending the Snowbird conference instead. Carlos Byars, a Houston Chronicle journalist who was familiar with Penfield and had seen the gravitational and magnetic data himself, wrote a story on Penfield and Camargo's claim, but the news did not disseminate widely.[13]: 23 

Although Penfield had plenty of geophysical data sets, he had no rock cores or other physical evidence of an impact.[5] He knew Pemex had drilled exploratory wells in the region. In 1951, one bored into what was described as a thick layer of andesite about 1.3 kilometers (4,300 ft) down. This layer could have resulted from the intense heat and pressure of an Earth impact, but at the time of the borings it was dismissed as a lava dome—a feature uncharacteristic of the region's geology.[5] Penfield was encouraged by William C. Phinney, curator of the lunar rocks at the Johnson Space Center, to find these samples to support his hypothesis.[3] Penfield tried to secure site samples, but was told they had been lost or destroyed. When attempts to return to the drill sites to look for corroborating rocks proved fruitless, Penfield abandoned his search, published his findings and returned to his Pemex work.[5] Seeing the 1980 Science paper, Penfield wrote to Walter Alvarez about the Yucatán structure, but received no response.[11]

Alvarez and other scientists continued their search for the crater, although they were searching in oceans based on incorrect analysis of glassy spherules from the K–Pg boundary that suggested the impactor had landed in open water.[10] Unaware of Penfield's discovery, University of Arizona graduate student Alan R. Hildebrand and faculty adviser William V. Boynton looked for a crater near the Brazos River in Texas.[10] Their evidence included greenish-brown clay with surplus iridium, containing shocked quartz grains and small weathered glass beads that looked to be tektites.[14] Thick, jumbled deposits of coarse rock fragments were also present, thought to have been scoured from one place and deposited elsewhere by an impact event. Such deposits occur in many locations but seemed concentrated in the Caribbean Basin at the K–Pg boundary. When Haitian professor Florentine Morás discovered what he thought to be evidence of an ancient volcano on Haiti, Hildebrand suggested it could be a telltale feature of a nearby impact. Tests on samples retrieved from the K–Pg boundary revealed more tektite glass, formed only in the heat of asteroid impacts and high-yield nuclear detonations.[5]

In 1990, Carlos Byars told Hildebrand of Penfield's earlier discovery of a possible impact crater.[15]: 50  Hildebrand contacted Penfield and the pair soon secured two drill samples from the Pemex wells, which had been stored in New Orleans for decades.[3] Hildebrand's team tested the samples, which clearly showed shock-metamorphic materials.[5] A team of California researchers surveying satellite images found a cenote (sinkhole) ring centered on the town of Chicxulub Pueblo that matched the one Penfield saw earlier; the cenotes were thought to be caused by subsidence of bolide-weakened lithostratigraphy around the impact crater wall.[16] More recent evidence suggests the crater is 300 km (190 mi) wide, and the 180 km (110 mi) ring is an inner wall of it.[17] Hildebrand, Penfield, Boynton, Camargo, and others published their paper identifying the crater in 1991.[10][14] The crater was named for the nearby town of Chicxulub. Penfield also recalled that part of the motivation for the name was "to give the academics and NASA naysayers a challenging time pronouncing it" after years of dismissing its existence.[3]

In March 2010, forty-one experts from many countries reviewed the available evidence: twenty years' worth of data spanning a variety of fields. They concluded that the impact at Chicxulub triggered the mass extinctions at the K–Pg boundary.[6][4] Dissenters, notably Gerta Keller of Princeton University, have proposed an alternate culprit: the eruption of the Deccan Traps in what is now the Indian subcontinent. This period of intense volcanism occurred before and after the Chicxulub impact;[6][18] dissenting studies argue that the worst of the volcanic activity occurred before the impact, and the role of the Deccan Traps was instead shaping the evolution of surviving species post-impact.[19] A 2013 study compared isotopes in impact glass from the Chicxulub impact with isotopes in ash from the K–Pg boundary, concluding that they were dated almost exactly the same within experimental error.[2]

Impact specifics

A 2013 study published in Science estimated the age of the impact as 66,043,000 ± 11,000 years ago (± 43,000 years ago considering systematic error), based on multiple lines of evidence, including argon–argon dating of tektites from Haiti and bentonite horizons overlying the impact horizon in northeastern Montana, United States.[2] This date was supported by a 2015 study based on argon–argon dating of tephra found in lignite beds in the Hell Creek and overlying Fort Union formations in northeastern Montana.[20] A 2018 study based on argon–argon dating of spherules from Gorgonilla Island, Colombia, obtained a slightly different result of 66,051,000 ± 31,000 years ago.[21] The impact has been interpreted to have occurred in Northern Hemisphere spring based on annual isotope curves in sturgeon and paddlefish bones found in an ejecta-bearing sedimentary unit at the Tanis site in southwestern North Dakota. This sedimentary unit is thought to have formed within hours of impact.[22] A 2020 study concluded that the Chicxulub crater was formed by an inclined (45–60° to horizontal) impact from the northeast.[23] The site of the crater at the time of impact was a marine carbonate platform.[24] The water depth at the impact site varied from 100 meters (330 ft) on the western edge of the crater to over 1,200 meters (3,900 ft) on the northeastern edge, with an estimated depth at the centre of the impact of approximately 650 meters (2,130 ft).[25] The seafloor rocks consisted of a sequence of Jurassic–Cretaceous marine sediments, 3 kilometers (1.9 mi) thick. They were predominantly carbonate rock, including dolomite (35–40% of total sequence) and limestone (25–30%), along with evaporites (anhydrite 25–30%), and minor amounts of shale and sandstone (3–4%) underlain by approximately 35 kilometers (22 mi) of continental crust, composed of igneous crystalline basement including granite.[26]

There is broad consensus that the Chicxulub impactor was a C-type asteroid with a carbonaceous chondrite-like composition, rather than a comet.[27] In 1998, a meteorite, approximately 2.5 millimeters (1⁄8 in) across, was described from a deep sea sediment core from the North Pacific, from a sediment sequence spanning the Cretaceous–Paleogene boundary (when the site was located in the central Pacific), with the meteorite being found at the base of the K-Pg boundary iridium anomaly within the sediment core. The meteorite was suggested to represent a fragment of the Chicxulub impactor. Analysis suggested that it best fitted the criteria of the CV, CO and CR groups of carbonaceous chondrites.[28] A 2021 paper suggested, based on geochemical evidence including the excess of chromium isotope 54Cr and the ratios of platinum group metals found in marine impact layers, that the impactor matched the characteristics of CM or CR carbonaceous chondrites.[27] The impactor was around 10 kilometers (6.2 miles) in diameter[27]—large enough that, if set at sea level, it would have reached taller than Mount Everest.[10]: 9 

Effects
see caption
An animation showing the Chicxulub impact and subsequent crater formation

The impactor's velocity was estimated at 20 kilometers per second (12 mi/s).[29] The kinetic energy of the impact was estimated at 72 teratonnes of TNT (300 ZJ).[30] The impact generated winds in excess of 1,000 kilometers per hour (620 mph) near the blast's center,[31] and produced a transient cavity 100 kilometers (62 mi) wide and 30 kilometers (19 mi) deep that later collapsed. This formed a crater mainly under the sea and covered by 600 meters (2,000 ft) of sediment by the 21st century.[32] The impact, expansion of water after filling the crater, and related seismic activity spawned megatsunamis over 100 meters (330 ft) tall, with one simulation suggesting the immediate waves from the impact may have reached up to 1.5 kilometers (0.93 mi) high.[33][34] The waves scoured the sea floor, leaving ripples underneath what is now Louisiana with average wavelengths of 600 meters (2,000 ft) and average wave heights of 16 meters (52 ft), the largest ripples documented.[35][36] Material shifted by subsequent earthquakes and the waves reached to what are now Texas and Florida, and may have disturbed sediments as far as 6,000 kilometers (3,700 mi) from the impact site.[37][33][38] The impact triggered a seismic event with an estimated magnitude of 9–11 Mw  at the impact site.[39]

A cloud of hot dust, ash and steam would have spread from the crater, with as much as 25 trillion metric tons of excavated material being ejected into the atmosphere by the blast. Some of this material escaped orbit, dispersing throughout the Solar System,[6] while some of it fell back to Earth, heated to incandescence upon re-entry. The rock heated Earth's surface and ignited wildfires, estimated to have enveloped nearly 70% of the planet's forests. The devastation to living creatures even hundreds of kilometers away was immense, and much of present-day Mexico and the United States would have been devastated.[5][10]: 10–13 [6] Fossil evidence for an instantaneous extinction of diverse animals was found in a soil layer only 10 centimeters (3.9 in) thick in New Jersey, 2,500 kilometers (1,600 mi) away from the impact site, indicating that death and burial under debris occurred suddenly and quickly over wide distances on land.[32] Field research from the Hell Creek Formation in North Dakota published in 2019 shows the simultaneous mass extinction of myriad species combined with geological and atmospheric features consistent with the impact event.[6]

Due to the relatively shallow water, the rock that was vaporized included sulfur-rich gypsum from the lower part of the Cretaceous sequence, and this was injected into the atmosphere.[32] This global dispersal of dust and sulfates would have led to a sudden and catastrophic effect on the climate worldwide, instigating large temperature drops and devastating the food chain. The researchers stated that the impact generated an environmental calamity that extinguished life, but it also induced a vast subsurface hydrothermal system that became an oasis for the recovery of life.[40][41] Researchers using seismic images of the crater in 2008 determined that the impactor landed in deeper water than previously assumed, which may have resulted in increased sulfate aerosols in the atmosphere, due to more water vapor being available to react with the vaporized anhydrite. This could have made the impact even deadlier by cooling the climate and generating acid rain.[42]

The emission of dust and particles could have covered the entire surface of Earth for several years, possibly up to a decade, creating a harsh environment for living things. Production of carbon dioxide caused by the destruction of carbonate rocks would have led to a sudden greenhouse effect.[14]: 5  For over a decade or longer, sunlight would have been blocked from reaching the surface of Earth by the dust particles in the atmosphere, cooling the surface dramatically. Photosynthesis by plants would also have been interrupted, affecting the entire food chain.[43][44] A model of the event developed by Lomax et al (2001) suggests that net primary productivity rates may have increased to higher than pre-impact levels over the long term because of the high carbon dioxide concentrations.[45]

A long-term local effect of the impact was the creation of the Yucatán sedimentary basin which "ultimately produced favorable conditions for human settlement in a region where surface water is scarce".[46]

Post-discovery investigations
see caption
Location of seismic surveys and boreholes

Geophysical data

Two seismic reflection datasets have been acquired over the offshore parts of the crater since its discovery. Older 2D seismic datasets have also been used that were originally acquired for hydrocarbon exploration. A set of three long-record 2D lines was acquired in October 1996, with a total length of 650 kilometers (400 mi), by the BIRPS group. The longest of the lines, Chicx-A, was shot parallel to the coast, while Chicx-B and Chicx-C were shot NW–SE and SSW–NNE respectively. In addition to the conventional seismic reflection imaging, data was recorded onshore to allow wide-angle refraction imaging.[47][48]

In 2005, another set of profiles was acquired, bringing the total length of 2D deep-penetration seismic data up to 2,470 kilometers (1,530 mi). This survey also used ocean bottom seismometers and land stations to allow 3D travel time inversion to improve the understanding of the velocity structure of the crater. The data was concentrated around the interpreted offshore peak ring to help identify possible drilling locations. At the same time, gravity data were acquired along 7,638 kilometers (4,746 mi) of profiles. The acquisition was funded by the National Science Foundation (NSF), Natural Environment Research Council (NERC) with logistical assistance from the National Autonomous University of Mexico (UNAM) and the Centro de Investigación Científica de Yucatán (CICY – Yucatán Center for Scientific Investigation).[24][49]

Borehole drilling

Intermittent core samples from hydrocarbon exploration boreholes drilled by Pemex on the Yucatán peninsula have provided some useful data. UNAM drilled a series of eight fully-cored boreholes in 1995, three of which penetrated deeply enough to reach the ejecta deposits outside the main crater rim, UNAM-5, 6 and 7. In 2001–2002, a scientific borehole was drilled near the Hacienda Yaxcopoil, known as Yaxcopoil-1 (or more commonly Yax-1), to a depth of 1,511 meters (4,957 ft) below the surface, as part of the International Continental Scientific Drilling Program. The borehole was cored continuously, passing through 100 meters (330 ft) of impactites. Three fully-cored boreholes were also drilled by the Comisión Federal de Electricidad (Federal Electricity Commission) with UNAM. One of them, (BEV-4), was deep enough to reach the ejecta deposits.[50]

In 2016, a joint United Kingdom–United States team obtained the first offshore core samples, from the peak ring in the central zone of the crater with the drilling of the borehole known as M0077A, part of Expedition 364 of the International Ocean Discovery Program. The borehole reached 1,335 meters (4,380 ft) below the seafloor.[51]

Morphology
see caption
Schematic cross-section over the Chicxulub impact structure

The form and structure (morphology) of the Chicxulub crater is known mainly from geophysical data. It has a well-defined concentric multi-ring structure. The outermost ring was identified using seismic reflection data. It is up to 130 kilometers (81 mi) from the crater center, and is a ring of normal faults, throwing down towards the crater center, marking the outer limit of significant crustal deformation. This makes it one of the three largest impact structures on Earth.[52][53] Moving into the center, the next ring is the main crater rim, also known as the "inner rim" which correlates with a ring of cenotes onshore and a major circular Bouguer gravity gradient anomaly.[25][54] This has a radius that varies between 70 and 85 kilometers (43 and 53 mi).[24] The next ring structure, moving inwards, is the peak ring. The area between the inner rim and peak ring is described as the "terrace zone", characterized by a series of fault blocks defined by normal faults dipping towards the crater center, sometimes referred to as "slump blocks". The peak ring is about 80 km in diameter and of variable height, from 400 to 600 meters (1,300 to 2,000 ft) above the base of the crater in the west and northwest and 200 to 300 meters (660 to 980 ft) in the north, northeast and east.[24] The central part of the crater lies above a zone where the mantle was uplifted such that the Moho is shallower by about 1–2 kilometers (0.62–1.24 mi) compared to regional values.[24][53]

The ring structures are best developed to the south, west and northwest, becoming more indistinct towards the north and northeast of the structure. This is interpreted to be a result of variable water depth at the time of impact, with less well-defined rings resulting from the areas with water depths significantly deeper than 100 meters (330 ft).[25]

Geology

Pre-impact geology
An image of a boardwalk over a body of water. A sign says "Chicxulub Puerto Mexico"
The center of the crater is near Chicxulub Puerto.
Stela in the main square of Chicxulub Puerto commemorating the impact

Before the impact, the geology of the Yucatán area, sometimes referred to as the "target rocks", consisted of a sequence of mainly Cretaceous limestones, overlying red beds of uncertain age above an unconformity with the dominantly granitic basement. The basement forms part of the Maya Block and information about its makeup and age in the Yucatán area has come only from drilling results around the Chicxulub crater and the analysis of basement material found as part of the ejecta at more distant K–Pg boundary sites. The Maya block is one of a group of crustal blocks found at the edge of the Gondwana continent. Zircon ages are consistent with the presence of an underlying Grenville age crust, with large amounts of late Ediacaran arc-related igneous rocks, interpreted to have formed in the Pan-African orogeny. Late Paleozoic granitoids (the distinctive "pink granite") were found in the peak ring borehole M0077A, with an estimated age of 326 ± 5 million years ago (Carboniferous). These have an adakitic composition and are interpreted to represent the effects of slab detachment during the Marathon-Ouachita orogeny, part of the collision between Laurentia and Gondwana that created the Pangaea supercontinent.[55]

Red beds of variable thickness, up to 115 meters (377 ft), overlay the granitic basement, particularly in the southern part of the area. These continental clastic rocks are thought to be of Triassic-to-Jurassic age, although they may extend into the Lower Cretaceous. The lower part of the Lower Cretaceous sequence consists of dolomite with interbedded anhydrite and gypsum, with the upper part being limestone, with dolomite and anhydrite in part. The thickness of the Lower Cretaceous varies from 750 meters (2,460 ft) up to 1,675 meters (5,495 ft) in the boreholes. The Upper Cretaceous sequence is mainly platform limestone, with marl and interbedded anhydrite. It varies in thickness from 600 meters (2,000 ft) up to 1,200 meters (3,900 ft). There is evidence for a Cretaceous basin within the Yucatán area that has been named the Yucatán Trough, running approximately south–north, widening northwards, explaining the observed thickness variations.[56]

Impact rocks

The most common observed impact rocks are suevites, found in many of the boreholes drilled around the Chicxulub crater. Most of the suevites were resedimented soon after the impact by the resurgence of oceanic water into the crater. This gave rise to a layer of suevite extending from the inner part of the crater out as far as the outer rim.[57]

Impact melt rocks are thought to fill the central part of the crater, with a maximum thickness of 3 kilometers (1.9 mi). The samples of melt rock that have been studied have overall compositions similar to that of the basement rocks, with some indications of mixing with carbonate source, presumed to be derived from the Cretaceous carbonates. An analysis of melt rocks sampled by the M0077A borehole indicates two types of melt rock, an upper impact melt (UIM), which has a clear carbonate component as shown by its overall chemistry and the presence of rare limestone clasts and a lower impact melt-bearing unit (LIMB) that lacks any carbonate component. The difference between the two impact melts is interpreted to be a result of the upper part of the initial impact melt, represented by the LIMB in the borehole, becoming mixed with materials from the shallow part of the crust either falling back into the crater or being brought back by the resurgence forming the UIM.[58]

The "pink granite", a granitoid rich in alkali feldspar found in the peak ring borehole shows many deformation features that record the extreme strains associated with the formation of the crater and the subsequent development of the peak ring.[40][59] The granitoid has an unusually low density and P-wave velocity compared to typical granitic basement rocks. Study of the core from M0077A shows the following deformation features in apparent order of development: pervasive fracturing along and through grain boundaries, a high density of shear faults, bands of cataclasite and ultra-cataclasite and some ductile shear structures. This deformation sequence is interpreted to result from initial crater formation involving acoustic fluidization followed by shear faulting with the development of cataclasites with fault zones containing impact melts.[60]

The peak ring drilling below the sea floor also discovered evidence of a massive hydrothermal system, which modified approximately 1.4 × 105 km3 of Earth's crust and lasted for hundreds of thousands of years. These hydrothermal systems may provide support for the impact origin of life hypothesis for the Hadean eon,[61] when the entire surface of Earth was affected by impactors much larger than the Chicxulub impactor.[62]

Post-impact geology

After the immediate effects of the impact had stopped, sedimentation in the Chicxulub area returned to the shallow water platform carbonate depositional environment that characterised it before the impact. The sequence, which dates back as far as the Paleocene, consists of marl and limestone, reaching a thickness of about 1,000 m (3,300 ft).[14]: 3  The K–Pg boundary inside the crater is significantly deeper than in the surrounding area.[14]: 4 

On the Yucatán peninsula, the inner rim of the crater is marked by clusters of cenotes,[63] which are the surface expression of a zone of preferential groundwater flow, moving water from a recharge zone in the south to the coast through a karstic aquifer system.[14]: 4 [64] From the cenote locations, the karstic aquifer is clearly related to the underlying crater rim,[65] possibly through higher levels of fracturing, caused by differential compaction.[66]

Astronomical origin of impactor

In September 2007, a report published in Nature proposed an origin for the asteroid that created the Chicxulub crater.[43] The authors, William F. Bottke, David Vokrouhlický, and David Nesvorný, argued that a collision in the asteroid belt 160 million years ago between a 170 km (106 mi) diameter parent body and another 60 km (37 mi) diameter body, resulted in the Baptistina family of asteroids, the largest surviving member of which is 298 Baptistina. They proposed that the "Chicxulub asteroid" was also a member of this group.[67]

The Baptistina family was subsequently considered an unlikely source of the Chicxulub asteroid because a spectrographic analysis published in 2009 revealed that 298 Baptistina has a different composition more typical of an S-type asteroid than the presumed carbonaceous chondrite composition of the Chicxulub impactor.[68] In 2011, data from the Wide-field Infrared Survey Explorer revised the date of the collision which created the Baptistina family to about 80 million years ago. This made an asteroid from this family highly improbable to be the asteroid that created the Chicxulub crater, as typically the process of resonance and collision of an asteroid takes many tens of millions of years.[69] In 2010, another hypothesis implicated the newly discovered asteroid 354P/LINEAR, a member of the Flora family of asteroids, as a possible remnant cohort of the K–Pg impactor.[70] In July 2021, a study reported that the impactor likely originated in the outer main part of the asteroid belt, based on numerical simulations.[71]

The original 1980 paper describing the crater suggested that it was created by an asteroid around 6.6 kilometers (4.1 mi) in diameter. Two papers published in 1984 proposed the impactor to be a comet originating from the Oort cloud, and it was proposed in 1992 that tidal disruption of comets could potentially increase impact rates.[27] In February 2021, four independent laboratories reported elevated concentrations of iridium in the crater's peak ring, further corroborating the asteroid impact hypothesis.[72] In the same month, Avi Loeb and a colleague published a study in Scientific Reports suggesting the impactor was a fragment from a disrupted comet, rather than an asteroid—the long-standing leading candidate among scientists.[73] This was followed by a rebuttal published in Astronomy & Geophysics that June, which charged that the paper ignored the fact that the mass of iridium deposited across the globe by the impact (estimated to be approximately 2.0–2.8 × 1011 grams), was too large to be created by a comet impactor the size required to create the crater, and that Loeb et al. had overestimated likely comet impact rates. They found that an asteroid impactor was strongly favored by all available evidence, and that a comet impactor could be effectively ruled out.[27]

See also

References
  1. "PIA03379: Shaded Relief with Height as Color, Yucatan Peninsula, Mexico". Shuttle Radar Topography Mission. NASA. Archived from the original on March 13, 2017. Retrieved October 28, 2010.
  2. Renne, P. R.; Deino, A. L.; Hilgen, F. J.; et al. (2013). "Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary" (PDF). Science. 339 (6120): 684–687. Bibcode:2013Sci...339..684R. doi:10.1126/science.1230492. ISSN 0036-8075. PMID 23393261. S2CID 6112274. Archived (PDF) from the original on April 3, 2018. Retrieved July 28, 2017.
  3. Penfield, Glen (2019). "Unlikely Impact". AAPG Explorer. 40 (12): 20–23. Archived from the original on January 16, 2021. Retrieved December 12, 2019.
  4. Schulte, P.; Alegret, L.; Arenillas, I.; et al. (2010). "The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary" (PDF). Science. 327 (5970): 1214–1218. Bibcode:2010Sci...327.1214S. doi:10.1126/science.1177265. ISSN 0036-8075. PMID 20203042. S2CID 2659741. Archived from the original (PDF) on December 9, 2011. Retrieved December 9, 2016.; Rincon, Paul (March 4, 2010). "Dinosaur extinction link to crater confirmed". BBC. Archived from the original on October 31, 2019. Retrieved March 5, 2010.
  5. Bates, Robin (series producer); Chesmar, Terri and Baniewicz, Rich (associate producers); Bakker, Robert T.; Hildebrand, Alan; Melosh, Gene; Moras, Florentine; Penfield, Glen (interviewees) (1992). The Dinosaurs! Episode 4: "Death of the Dinosaur" (TV-series). PBS Video, WHYY-TV.
  6. Preston, Douglas (March 29, 2019). "The Day The Dinosaurs Died". The New Yorker. Archived from the original on May 18, 2019. Retrieved May 13, 2019.
  7. Alvarez, W.; Alvarez, L.W.; Asaro, F.; Michel, H.V. (1979). "Anomalous iridium levels at the Cretaceous/Tertiary boundary at Gubbio, Italy: Negative results of tests for a supernova origin". In Christensen, W.K.; Birkelund, T. (eds.). Cretaceous/Tertiary Boundary Events Symposium. Vol. 2. University of Copenhagen, Copenhagen, Denmark. p. 69.; Becker, Luann (2002). "Repeated Blows" (PDF). Scientific American. 286 (3): 76–83. Bibcode:2002SciAm.286c..76B. doi:10.1038/scientificamerican0302-76. PMID 11857903. Archived (PDF) from the original on December 8, 2003. Retrieved January 28, 2016.
  8. Alvarez, Luis; Alvarez, Walter; Asaro, Frank; Michel, Helen (June 6, 1980). "Extraterrestrial Cause for the Cretaceous-Tertiary Extinction". Science. 208 (4408): 1095–1108. Bibcode:1980Sci...208.1095A. doi:10.1126/science.208.4448.1095. ISSN 0036-8075. PMID 17783054. S2CID 16017767.
  9. Mayell, Hillary (May 15, 2005). "Asteroid Rained Glass Over Entire Earth, Scientists Say". National Geographic News. Archived from the original on September 18, 2016. Retrieved October 1, 2007.
  10. Alvarez, Walter (2008). T. Rex and the Crater of Doom. Princeton University Press. ISBN 978-0-691-13103-0.
  11. Weinreb, David B. (March 2002). "Catastrophic Events in the History of Life: Toward a New Understanding of Mass Extinctions in the Fossil Record – Part I". jyi.org. Archived from the original on October 18, 2007. Retrieved October 3, 2007.
  12. Osterloff, Emily (2018). "How an asteroid ended the age of the dinosaurs". London, England: Natural History Museum. Archived from the original on April 26, 2022. Retrieved May 18, 2022.
  13. Verschuur, Gerrit L. (1996). Impact!: The Threat of Comets and Asteroids. Oxford University Press (U.S.). ISBN 978-0-19-511919-0.
  14. Hildebrand, Alan R.; Penfield, Glen T.; Kring, David A.; et al. (September 1991). "Chicxulub Crater; a possible Cretaceous/Tertiary boundary impact crater on the Yucatan Peninsula, Mexico". Geology. 19 (9): 867–871. Bibcode:1991Geo....19..867H. doi:10.1130/0091-7613(1991)019<0867:CCAPCT>2.3.CO;2.
  15. Frankel, Charles (1999). The End of the Dinosaurs: Chicxulub Crater and Mass Extinctions. Cambridge, England: Cambridge University Press. p. 236. ISBN 978-0-521-47447-4.
  16. Pope KO; Baines KH; Ocampo AC; Ivanov BA (1997). "Energy, volatile production, and climatic effects of the Chicxulub Cretaceous/Tertiary impact". Journal of Geophysical Research. Washington, D.C.: American Geophysical Union. 102 (E9): 245–264. Bibcode:1997JGR...10221645P. doi:10.1029/97JE01743. PMID 11541145.
  17. Sharpton, Vernon L.; Marin, Luis E. (May 1997). "The Cretaceous–Tertiary impact crater and the cosmic projectile that produced it". Annals of the New York Academy of Sciences. New York City: Wiley-Blackwell. 822 (1): 353–380. Bibcode:1997NYASA.822..353S. doi:10.1111/j.1749-6632.1997.tb48351.x. PMID 11543120. S2CID 11962090.
  18. Keller, Gerta; Mateo, Paula; Monkenbusch, Johannes; et al. (November 2020). "Mercury linked to Deccan Traps volcanism, climate change and the end-Cretaceous mass extinction". Global and Planetary Change. 194: 103312. Bibcode:2020GPC...19403312K. doi:10.1016/j.gloplacha.2020.103312. S2CID 225275560.
  19. Hull, Pincelli M.; Bornemann, André; Penman, Donald E.; et al. (January 17, 2020). "On impact and volcanism across the Cretaceous-Paleogene boundary". Science. 367 (6475): 266–272. Bibcode:2020Sci...367..266H. doi:10.1126/science.aay5055. ISSN 0036-8075. PMID 31949074. S2CID 210698721.
  20. Sprain, C. J.; Renne, P. R.; Wilson, G. P.; Clemens, W. A. (March 1, 2015). "High-resolution chronostratigraphy of the terrestrial Cretaceous-Paleogene transition and recovery interval in the Hell Creek region, Montana". Geological Society of America Bulletin. 127 (3–4): 393–409. Bibcode:2015GSAB..127..393S. doi:10.1130/B31076.1. ISSN 0016-7606. S2CID 129291530.
  21. Renne, Paul R.; Arenillas, Ignacio; Arz, José A.; et al. (June 1, 2018). "Multi-proxy record of the Chicxulub impact at the Cretaceous-Paleogene boundary from Gorgonilla Island, Colombia". Geology. 46 (6): 547–550. Bibcode:2018Geo....46..547R. doi:10.1130/G40224.1. ISSN 0091-7613. S2CID 135274460.
  22. During, Melanie A. D.; Smit, Jan; Voeten, Dennis F. A. E.; et al. (February 23, 2022). "The Mesozoic terminated in boreal spring". Nature. 603 (7899): 91–94. Bibcode:2022Natur.603...91D. doi:10.1038/s41586-022-04446-1. PMC 8891016. PMID 35197634.
  23. Collins, G. S.; Patel, N.; Davison, T. M.; et al. (2020). "A steeply-inclined trajectory for the Chicxulub impact". Nature Communications. Vol. 11, no. 1480. doi:10.1038/s41467-020-15269-x. S2CID 218898524.
  24. Gulick, S.P.S.; Christeson, G.L.; Barton, P.J.; et al. (January 2013). "Geophysical characterization of the Chicxulub impact crater". Reviews of Geophysics. 51 (1): 31–52. Bibcode:2013RvGeo..51...31G. doi:10.1002/rog.20007. ISSN 8755-1209. S2CID 55502139.
  25. Gulick, Sean P. S.; Barton, Penny J.; Christeson, Gail L.; et al. (February 2008). "Importance of pre-impact crustal structure for the asymmetry of the Chicxulub impact crater". Nature Geoscience. 1 (2): 131–135. Bibcode:2008NatGe...1..131G. doi:10.1038/ngeo103. ISSN 1752-0894. S2CID 128949260.
  26. Navarro, Karina F.; Urrutia-Fucugauchi, Jaime; Villagran-Muniz, Mayo; et al. (August 2020). "Emission spectra of a simulated Chicxulub impact-vapor plume at the Cretaceous–Paleogene boundary". Icarus. 346: 113813. Bibcode:2020Icar..34613813N. doi:10.1016/j.icarus.2020.113813. S2CID 218965047.
  27. Desch, Steve; Jackson, Alan; Noviello, Jessica; Anbar, Ariel (June 1, 2021). "The Chicxulub impactor: comet or asteroid?". Astronomy & Geophysics. 62 (3): 3.34–3.37. arXiv:2105.08768. doi:10.1093/astrogeo/atab069. ISSN 1366-8781. S2CID 234777761.
  28. Kyte, Frank T. (November 1998). "A meteorite from the Cretaceous/Tertiary boundary". Nature. 396 (6708): 237–239. Bibcode:1998Natur.396..237K. doi:10.1038/24322. ISSN 0028-0836. S2CID 4381596. Archived from the original on May 20, 2021. Retrieved June 7, 2021.
  29. Collins, G. S.; Patel, N.; Davison, T. M.; Rae, A. S. P.; Morgan, J. V.; Gulick, S. P. S. (May 26, 2020). "A steeply-inclined trajectory for the Chicxulub impact". Nature Communications. 11 (1): 1480. Bibcode:2020NatCo..11.1480C. doi:10.1038/s41467-020-15269-x. ISSN 2041-1723. PMC 7251121. PMID 32457325.
  30. Richards, Mark A.; Alvarez, Walter; Self, Stephen; Karlstrom, Leif; Renne, Paul R.; Manga, Michael; Sprain, Courtney J.; Smit, Jan; Vanderkluysen, Loÿc; Gibson, Sally A. (November 1, 2015). "Triggering of the largest Deccan eruptions by the Chicxulub impact". Geological Society of America Bulletin. 127 (11–12): 1507–1520. Bibcode:2015GSAB..127.1507R. doi:10.1130/B31167.1. ISSN 0016-7606. S2CID 3463018.
  31. "Chicxulub Impact Event: Regional Effects". Lunar and Planetary Institute. Archived from the original on July 26, 2019. Retrieved June 1, 2020.
  32. Amos, Jonathan (May 15, 2017). "Dinosaur asteroid hit 'worst possible place'". Science and Environment. BBC News. Archived from the original on March 18, 2018. Retrieved August 19, 2017.
  33. "Huge Global Tsunami Followed Dinosaur-Killing Asteroid Impact". December 20, 2018. Archived from the original on July 11, 2020. Retrieved July 11, 2020.
  34. Bryant, Edward (June 2014). Tsunami: The underrated hazard. Springer. p. 178. ISBN 978-3-319-06133-7.
  35. Koumoundouros, Tessa (July 14, 2021). "Fossilized Tsunami 'Megaripples' Reveal The Devastation From The Chicxulub Asteroid". ScienceAlert. Retrieved January 1, 2022.
  36. Kinsland, Gary L.; Egedahl, Kaare; Strong, Martell Albert; Ivy, Robert (September 15, 2021). "Chicxulub impact tsunami megaripples in the subsurface of Louisiana: Imaged in petroleum industry seismic data". Earth and Planetary Science Letters. 570: 117063. Bibcode:2021E&PSL.57017063K. doi:10.1016/j.epsl.2021.117063. ISSN 0012-821X. S2CID 237653482.
  37. Palmer, Jane (February 25, 2016). "We Finally Know How Much the Dino-Killing Asteroid Reshaped Earth". Smithsonian.com. Smithsonian Institution. Archived from the original on February 28, 2016. Retrieved February 26, 2016.
  38. Goto, Kazuhisa; Tada, Ryuji; Tajika, Eiichi; et al. (2004). "Evidence for ocean water invasion into the Chicxulub crater at the Cretaceous/Tertiary boundary". Meteoritics & Planetary Science. 39 (8): 1233–1247. Bibcode:2004M&PS...39.1233G. doi:10.1111/j.1945-5100.2004.tb00943.x. ISSN 1945-5100. S2CID 55674339., Range, Molly M.; Arbic, SAND-Brian K.; Johnson, Brandon C.; et al. (December 14, 2018). "The Chicxulub Impact Produced a Powerful Global Tsunami". AGU Fall Meeting Abstracts. AGU. 2018. Bibcode:2018AGUFMPP53B..07R. Archived from the original on July 15, 2020. Retrieved July 11, 2020 – via agu.confex.com., Matsui, T.; Imamura, F.; Tajika, E.; Nakano, Y.; Fujisawa, Y. (2002). "Generation and propagation of a tsunami from the Cretaceous-Tertiary impact event". Research Gate. Special Paper of the Geological Society of America 356. pp. 69–77. Archived from the original on October 20, 2021. Retrieved March 29, 2021.
  39. Richards, Mark A.; Alvarez, Walter; Self, Stephen; et al. (November 1, 2015). "Triggering of the largest Deccan eruptions by the Chicxulub impact". GSA Bulletin. 127 (11–12): 1507–1520. Bibcode:2015GSAB..127.1507R. doi:10.1130/B31167.1. ISSN 0016-7606. S2CID 3463018. Archived from the original on October 20, 2021. Retrieved October 9, 2021.
  40. Kring, David A; Claeys, Philippe; Gulick, Sean P.S.; Morgan, Joanna V.; Collins, Gareth S. (October 10, 2017). "Chicxulub and the Exploration of Large Peak-Ring Impact Craters through Scientific Drilling" (PDF). GSA Today. The Geological Society of America. ISSN 1052-5173. Archived from the original (PDF) on October 10, 2017. Retrieved February 1, 2022.
  41. Shaulis, Barry J.; Riller, Ulrich; Cockell, Charles; Coolen, Marco J. L. (2017). "Probing the impact-generated hydrothermal system in the peak ring of the Chicxulub crater and its potential as a habitat" (PDF). Lunar and Planetary Science. XLVIII (1964): 1212. Bibcode:2017LPI....48.1212K. Archived from the original (PDF) on October 26, 2020.
  42. Airhart, Marc (January 1, 2008). "Seismic Images Show Dinosaur-Killing Meteor Made Bigger Splash". Archived from the original on December 20, 2014. Retrieved November 29, 2011.
  43. Perlman, David (September 6, 2007). "Scientists say they know where dinosaur-killing asteroid came from". San Francisco Chronicle. Archived from the original on April 4, 2012. Retrieved October 3, 2007.
  44. Pope KO; Ocampo AC; Kinsland GL; Smith R (1996). "Surface expression of the Chicxulub crater". Geology. 24 (6): 527–530. Bibcode:1996Geo....24..527P. doi:10.1130/0091-7613(1996)024<0527:SEOTCC>2.3.CO;2. PMID 11539331.
  45. Lomax, B.; Beerling, D.; Upchurch, G. Jr.; Otto-Bliesner, B. (2001). "Rapid (10-yr) recovery of terrestrial productivity in a simulation study of the terminal Cretaceous impact event". Earth and Planetary Science Letters. 192 (2): 137–144. Bibcode:2001E&PSL.192..137L. doi:10.1016/S0012-821X(01)00447-2. S2CID 140196018.
  46. Winemiller, Terance L. (2007). The Chicxulub meteor impact and ancient locational decisions on the Yucatán Peninsula, Mexico: The application of remote sensing, GIS, and GPS in settlement pattern Studies (PDF). ASPRS 2007 Annual Conference. Tampa, Florida: American Society for Photogrammetry and Remote Sensing. Archived (PDF) from the original on August 10, 2017. Retrieved October 2, 2012.
  47. Morgan, J.; Warner, M.; Brittan, J.; et al. (1997). "Size and morphology of the Chicxulub impact crater". Nature. 390 (6659): 472–476. Bibcode:1997Natur.390..472M. doi:10.1038/37291. S2CID 4398542.
  48. Snyder D.B.; Hobbs R.W. (1999). "Deep seismic reflection profiles across the Chicxulub crater". In Dressler B.O.; Sharpton V.L. (eds.). Large Meteorite Impacts and Planetary Evolution II. Special Publication. Vol. 339. Geological Society of America. ISBN 978-0-8137-2339-6.
  49. Morgan, J.; Urrutia-Fucugauchi, J.; Gulick, S.; et al. (2005). "Chicxulub Crater Seismic Survey prepares way for future drilling". Eos. 86 (36): 325–328. Bibcode:2005EOSTr..86..325M. doi:10.1029/2005EO360001.
  50. Center for Lunar Science and Exploration (2019). "Classroom Illustrations: Chicxulub Crater". Retrieved March 24, 2022.; Urrutia-Fucugauchi, J.; Chavez-Aguirre, J.M.; Pérez-Cruz, L.; De la Rosa, J.L. (2008). "Impact ejecta and carbonate sequence in the eastern sector of the Chicxulub crater". Comptes Rendus Geoscience. 340 (12): 801–810. Bibcode:2008CRGeo.340..801U. doi:10.1016/j.crte.2008.09.001. S2CID 129121808.
  51. Amos, Jonathan (April 5, 2016). "Project to drill into 'dinosaur crater' gets under way". BBC News. Archived from the original on April 6, 2016. Retrieved April 5, 2016.; Amos, Jonathan (May 25, 2016). "Chicxulub 'dinosaur' crater drill project declared a success". BBC News. Archived from the original on May 28, 2016. Retrieved May 25, 2016.
  52. Morgan, J.; Warner, M.; the Chicxulub Working Group; et al. (1997). "Size and morphology of the Chicxulub impact crater". Nature. 390 (6659): 472–476. Bibcode:1997Natur.390..472M. doi:10.1038/37291. S2CID 4398542.
  53. Melosh, J. (2001). "Deep down at Chicxulub". Nature. 414 (6866): 861–862. doi:10.1038/414861a. PMID 11780048. S2CID 33062203.
  54. Hildebrand, A.; Pilkington, M.; Conors, M.; Ortiz-Aleman, C.; Chavez, R.E. (1995). "Size and structure of the Chicxulub crater revealed by horizontal gravity gradients and cenotes". Nature. 376 (6539): 415–417. Bibcode:1995Natur.376..415H. doi:10.1038/376415a0. S2CID 4250257.
  55. Zhao, J.; Xiao, L.; Gulick, S.P.S.; et al. (2020). "Geochemistry, geochronology and petrogenesis of Maya Block granitoids and dykes from the Chicxulub Impact Crater, Gulf of México: Implications for the assembly of Pangea" (PDF). Gondwana Research. 82: 128–150. Bibcode:2020GondR..82..128Z. doi:10.1016/j.gr.2019.12.003. S2CID 214359672.
  56. Guzmán-Hidalgo, E.; Grajales-Nishimura, J.M.; Eberli, G.P.; et al. (2021). "Seismic stratigraphic evidence of a pre-impact basin in the Yucatán Platform: morphology of the Chicxulub crater and K/Pg boundary deposits". Marine Geology. 441: 106594. Bibcode:2021MGeol.441j6594G. doi:10.1016/j.margeo.2021.106594. S2CID 238783773.
  57. Kaskes, P.; de Graaf, S.J.; Feignon, J.-G.; et al. (2022). "Formation of the crater suevite sequence from the Chicxulub peak ring: A petrographic, geochemical, and sedimentological characterization" (PDF). GSA Bulletin. 134 (3–4): 895–927. Bibcode:2022GSAB..134..895K. doi:10.1130/B36020.1. S2CID 237762081.
  58. de Graaf, S.J.; Kaskes, P.; Déhais, T.; et al. (2022). "New insights into the formation and emplacement of impact melt rocks within the Chicxulub impact structure, following the 2016 IODP-ICDP Expedition 364" (PDF). GSA Bulletin. 134 (1–2): 293–315. Bibcode:2022GSAB..134..293D. doi:10.1130/B35795.1. S2CID 236541913.
  59. St. Fleur, Nicholas (November 17, 2016). "Drilling into the Chicxulub Crater, Ground Zero of the Dinosaur Extinction". The New York Times. Archived from the original on November 19, 2016. Retrieved March 1, 2017.
  60. Riller, U.; Poelchau, M.H.; Rae, A.S.P.; et al. (2018). "Rock fluidization during peak-ring formation of large impact structures" (PDF). Nature. 562 (7728): 511–518. Bibcode:2018Natur.562..511R. doi:10.1038/s41586-018-0607-z. PMID 30356184. S2CID 53026325.
  61. Kring, David; Tikoo, Sonia M.; Schmieder, Martin; et al. (2020). "Probing the hydrothermal system of the Chicxulub impact crater". Science Advances. 6 (22). doi:10.1126/sciadv.aaz3053. S2CID 219244669.
  62. Marchi, S.; Bottke, W. F.; Elkins-Tanton, L. T.; et al. (2014). "Widespread mixing and burial of Earth's Hadean crust by asteroid impacts". Nature. 511 (7511): 578–582. Bibcode:2014Natur.511..578M. doi:10.1038/nature13539. PMID 25079556. S2CID 205239647.
  63. "Meteor impact site". National Geographic (video). Earth: The biography. July 11, 2008. Archived from the original on October 17, 2015. Retrieved August 19, 2015.
  64. Pérez-Ceballos, R.; Canul-Macario, C.; Pacheco-Castro, R.; et al. (2021). "Regional Hydrogeochemical Evolution of Groundwater in the Ring of Cenotes, Yucatán (Mexico): An Inverse Modelling Approach". Water. 13 (5): 614. doi:10.3390/w13050614.
  65. Kring, David A. "Discovering the Crater". lpl.arizona.edu. Archived from the original on October 10, 2007. Retrieved October 12, 2007.
  66. Hildebrand, A.R.; Pilkington, M.; Ortiz-Aleman, C.; et al. (1998). "Mapping Chicxulub crater structure with gravity and seismic reflection data". In Grady, M.M.; Hutchinson, R.; McCall, G.J.H.; Rothery, D.A. (eds.). Meteorites: Flux with Time and Impact Effects. Special Publications. Vol. 140. London: Geological Society. p. 160. doi:10.1144/GSL.SP.1998.140.01.12. ISBN 9781862390171. S2CID 130177601.
  67. Bottke, W.F.; Vokrouhlicky, D.; Nesvorny, D. (September 2007). "An asteroid breakup 160 Myr ago as the probable source of the K/T impactor" (PDF). Nature. 449 (7158): 23–25. Bibcode:2007Natur.449...48B. doi:10.1038/nature06070. PMID 17805288. S2CID 4322622. Archived (PDF) from the original on April 24, 2020. Retrieved October 3, 2007.; Ingham, Richard (September 5, 2007). "Traced: The asteroid breakup that wiped out the dinosaurs". Agence France-Presse. Archived from the original on November 14, 2007. Retrieved September 27, 2007.
  68. Reddy, Vishnu; Emery, Joshua P.; Gaffey, Michael J.; et al. (December 2009). "Composition of 298 Baptistina: Implications for the K/T impactor link". Meteoritics & Planetary Science. 44 (12): 1917–1927. Bibcode:2009M&PS...44.1917R. doi:10.1111/j.1945-5100.2009.tb02001.x. S2CID 39644763.
  69. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; et al. (November 10, 2011). "Main belt asteroids with WISE / NEOWISE. I. Preliminary albedos and diameters". The Astrophysical Journal. 741 (2): 68. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. ISSN 0004-637X. S2CID 118745497.
  70. "Smashed asteroids may be related to dinosaur killer". Reuters. February 2, 2010. Archived from the original on October 4, 2019. Retrieved July 5, 2021.
  71. Nesvorný, David; Bottke, William F.; Marchi, Simone (November 1, 2021). "Dark primitive asteroids account for a large share of K/Pg-scale impacts on the Earth". Icarus. 368: 114621. arXiv:2107.03458. Bibcode:2021Icar..36814621N. doi:10.1016/j.icarus.2021.114621. ISSN 0019-1035. S2CID 235765478.
  72. Goderis, Stephen; Sato, Honami; Ferrière, Ludovic; et al. (February 24, 2021). "Globally distributed iridium layer preserved within the Chicxulub impact structure". Science Advances. 7 (9): eabe3647. Bibcode:2021SciA....7.3647G. doi:10.1126/sciadv.abe3647. hdl:10044/1/86827. PMC 7904271. PMID 33627429.
  73. Ferreira, Becky (February 15, 2021). "Where Did the Dinosaur-Killing Impactor Come From? – A new study blames a comet fragment for the death of the dinosaurs 66 million years ago. But most experts maintain that an asteroid caused this cataclysmic event". The New York Times. Archived from the original on February 15, 2021. Retrieved February 15, 2021.; Siraj, Amir (February 15, 2021). "Breakup of a long-period comet as the origin of the dinosaur extinction". Scientific Reports. 11 (3803): 3803. arXiv:2102.06785. Bibcode:2021NatSR..11.3803S. doi:10.1038/s41598-021-82320-2. PMC 7884440. PMID 33589634.
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