North Atlantic Igneous Province

The North Atlantic Igneous Province (NAIP) is a large igneous province in the North Atlantic, centered on Iceland. In the Paleogene, the province formed the Thulean Plateau, a large basaltic lava plain,[1] which extended over at least 1.3 million km2 (500 thousand sq mi) in area and 6.6 million km3 (1.6 million cu mi) in volume.[2] The plateau was broken up during the opening of the North Atlantic Ocean leaving remnants preserved in north Ireland, west Scotland, the Faroe Islands, northwest Iceland, east Greenland, western Norway and many of the islands located in the north eastern portion of the North Atlantic Ocean.[3][4] The igneous province is the origin of the Giant's Causeway and Fingal's Cave. The province is also known as Brito–Arctic province (also known as the North Atlantic Tertiary Volcanic Province) and the portion of the province in the British Isles is also called the British Tertiary Volcanic Province or British Tertiary Igneous Province.

The British Tertiary Volcanic Province (based on Emeleus & Gyopari 1992[5] and Mussett et al. 1988[6]) with UK map shown in context of the world map

Formation

Isotopic dating indicates the most active magmatic phase of the NAIP was between c. 60.5[7] and c. 54.5 Ma (million years ago)[8] (mid-Paleocene to early Eocene) – further divided into Phase 1 (pre-break-up phase) dated to c. 62-58 Ma and Phase 2 (syn-break-up phase) dated to c. 56-54 Ma.[9]

Continuing research also indicates that tectonic plate movement (of the Eurasian, Greenland, and North American plates), regional rifting events, and seafloor spreading between Labrador and Greenland may have begun as early as c. 95-80 Ma,[10] c. 81 Ma,[11] and c. 63–61 Ma[12][13] respectively (late Cretaceous to early Paleocene).

Studies have suggested that the modern day Iceland hotspot corresponds to the earlier 'North Atlantic mantle plume' that would have created the NAIP.[14] Through both geochemical observations and reconstructions of paleogeography, it is speculated that the present day Iceland hotspot originated as a mantle plume on the Alpha Ridge (Arctic Ocean) c. 130–120 Ma,[15] migrated down Ellesmere Island, through Baffin Island, onto the west coast of Greenland, and finally arrived on the east coast of Greenland by c. 60 Ma.[16]

Extensive outpourings of lava occurred, particularly in East Greenland,[17] which during the Paleogene was then adjacent to Britain. Little is known of the geodynamics of the opening of the North Atlantic between Greenland and Europe.[18]

As the Earth's crust was stretched above the mantle hotspot under stress from plate rifting,[19] fissures opened up along a line from Ireland to the Hebrides and plutonic complexes were formed.[20] Hot magma over 1000 °C surfaced as multiple, successive and extensive lava flows covered over the original landscape, burning forests, filling river valleys, burying hills, to eventually form the Thulean Plateau, which contained various volcanic landforms such as lava fields and volcanoes.[5] There was more than one period of volcanic activity during the NAIP, in between which sea levels rose and fell and erosion took place.[21]

Volcanic activity would have started with volcaniclastic accumulations, like volcanic ash, quickly followed by vast outpourings of highly fluid basaltic lava during successive eruptions through multiple volcanic vents or in linear fissures. As mafic low viscosity lava reached the surface it rapidly cooled and solidified, successive flows built up layer upon layer, each time filling and covering existing landscapes. Hyaloclastites and pillow lavas were formed when the lava flowed into lakes, rivers and seas. Magma that did not make it to the surface as flows froze in conduits as dikes and volcanic plugs and large amounts spread laterally to form sills. Dike swarms extended across the British Isles throughout the Cenozoic. Individual central complexes developed with arcuate intrusions (cone sheets, ring dikes and stocks), the intrusions of one centre cut through earlier centres recording magmatic activity with time. During intermittent periods of erosion and change in sea levels, heated waters circulated through the flows altering the basalts and deposited distinctive suites of zeolite minerals.[6]

Activity of the NAIP 55 million years ago may have caused the Paleocene–Eocene Thermal Maximum, where a large amount of carbon was released into the atmosphere and the Earth substantially warmed.[22][23] One hypothesis is that the uplift caused by the NAIP hotspot caused methane clathrates to dissociate and dump 2000 gigatons of carbon into the atmosphere.[24]

Igneous landforms
Satellite photo of Ardnamurchan – with clearly visible circular shape, which is the 'plumbings of an ancient volcano'[25]
An Sgurr, Eigg – largest exposed piece of pitchstone in the UK[26]
Basalt columns inside Fingal's Cave
Giant's Causeway – polygonal basalt pavement

The NAIP is made up of both onshore and offshore basalt floods, sills, dykes, and plateaus. Dependent upon various regional locations, the NAIP is made up of MORB (Mid Ocean Ridge Basalt), alkali basalt,[27][28] tholeiitic basalt, and picrite basalt.[29]

Basaltic volcanic rocks up to 2.5 kilometres (1.6 mi) thick cover 65,000 square kilometres (25,000 sq mi) in east Greenland. Numerous intrusions related to hot-spot magmatism are exposed in the coastal region of east Greenland. The intrusions show a wide range of compositions. The Skaergaard intrusion (Early Cenozoic or about 55 million year age) is a layered gabbro (mafic) intrusion that has mineralized rock units enriched in palladium and gold. In contrast, the Werner Bjerge complex is made up of potassium- and sodium-rich (alkaline) granitic rock, containing molybdenum.[30]

Locations of submarine central complexes within the NAIP include:[20]

United Kingdom

The British portion of the NAIP, particularly West Scotland, provides relatively easy access, compared to the largely inaccessible basalt fields of West Greenland, to deeply eroded relics of the central volcanic complexes.[31]

Locations of major intrusion complexes within the British part of the NAIP include:

Those occurrences within the Hebrides are sometimes referred to as the Hebridean Igneous Province.[50]

Other notable NAIP landform locations in the United Kingdom include:

Republic of Ireland

Carlingford, County Louth is the only location of a major intrusion complex within the Republic of Ireland's part of the NAIP.[56][57]

History of geological studies

The intensity of scientific investigation within the NAIP has made it one of the most historically important and deeply studied igneous provinces in the world. Basalt petrology was born in the Scottish Hebrides in 1903 led by the eminent British geologist Sir Archibald Geikie. From the outset Geikie studied the geology of Skye and other Western Isles taking a keen interest in volcanic geology and in 1871 he presented the Geological Society of London with an outline of the 'Tertiary Volcanic History of Britain'.[58] Following Geikie many have tried, and continue to study and understand the NAIP, and in doing so have advanced knowledge in geology, mineralogy and in more recent decades geochemistry and geophysics.[5]

See also

References
  1. Brittle tectonism in relation to the Palaeogene evolution of the Thulean/NE Atlantic domain: a study in Ulster Retrieved on 2007-11-10
  2. Eldholm, Olav; Kjersti Grue (10 February 1994). "North Atlantic volcanic margins: Dimensions and production rates". Journal of Geophysical Research: Solid Earth. 99 (B2): 2955–2968. Bibcode:1994JGR....99.2955E. doi:10.1029/93JB02879. Quantitative calculations of NAVP dimensions, considered minimum estimates, reveal an areal extent of 1.3{{e|6}} km2 and a volume of flood basalts of 1.8×106 km3, yielding a mean eruption rate of 0.6 km3/yr or 2.4 km3/yr if two-thirds of the basalts were emplaced within 0.5 m.y. The total crustal volume is 6.6×106 km3, resulting in a mean crustal accretion rate of 2.2 km3/yr. Thus NAVP ranks among the world's larger igneous provinces if the volcanic margins are considered.
  3. D.W. Jolley; B.R. Bell, eds. (2002). The North Atlantic igneous province stratigraphy, tectonic, volcanic, and magmatic processes. London: Geological Society. ISBN 978-1-86239-108-6.
  4. Courtillot, Vincent E; Renne, Paul R (January 2003). "On the ages of flood basalt events" (PDF). Comptes Rendus Geoscience. 335 (1): 113–140. Bibcode:2003CRGeo.335..113C. CiteSeerX 10.1.1.461.3338. doi:10.1016/S1631-0713(03)00006-3. Archived (PDF) from the original on 2008-11-20. Retrieved 2008-06-15. From file page 7 onward: Brito-Arctic Province section (section also discusses age, pulses of activity, and volume)
  5. Emeleus, C.H.; Gyopari, M.C. (1992). British Tertiary Volcanic Province. Geological Conservation Review. London: Chapman & Hall on behalf of Joint Nature Conservation Committee.
  6. Mussett, A. E.; Dagley, P.; Skelhorn, R. R. (1 January 1988). "Time and duration of activity in the British Tertiary Igneous Province". Geological Society, London, Special Publications. 39 (1): 337–348. Bibcode:1988GSLSP..39..337M. doi:10.1144/GSL.SP.1988.039.01.29. S2CID 128895442.
  7. TROLL, VALENTIN R.; NICOLL, GRAEME R.; DONALDSON, COLIN H.; EMELEUS, HENRY C. (May 2008). "Dating the onset of volcanism at the Rum Igneous Centre, NW Scotland". Journal of the Geological Society. 165 (3): 651–659. Bibcode:2008JGSoc.165..651T. doi:10.1144/0016-76492006-190. ISSN 0016-7649. S2CID 129576178.
  8. Jolley, D. W.; Bell, B. R. (1 January 2002). "The evolution of the North Atlantic Igneous Province and the opening of the NE Atlantic rift". Geological Society, London, Special Publications. 197 (1): 1–13. Bibcode:2002GSLSP.197....1J. doi:10.1144/GSL.SP.2002.197.01.01. S2CID 129653395. Archived from the original on 19 January 2013. Retrieved 17 December 2013. 40Ar/39Ar and Pb-U isotopic age data show that the main period of continental flood basalt volcanism in the NAIP extended from ~60.5 Ma through to ~54.5 Ma.
  9. Rousse, S.; M. Ganerød; M.A. Smethurst; T.H. Torsvik; T. Prestvik (2007). "The British Tertiary Volcanics: Origin, History and New Paleogeographic Constraints for the North Atlantic" (PDF). Geophysical Research Abstracts. 9. Archived (PDF) from the original on 2013-12-17. Retrieved 2013-12-17. The NAIP formed during two major magmatic phases: a pre-break-up phase (62–58 Ma) and a syn-break-up phase (56-54 Ma) contemporaneous with the onset of North Atlantic sea floor spreading.
  10. Torsvik, T.H.; B. Steinberger; C. Gaina (2007). "North Atlantic Plate Motions and Plumes" (PDF). Geophysical Research Abstracts. 9. Archived (PDF) from the original on 2013-12-17. Retrieved 2013-12-17. Fixed hotspot frames show uniform NE movement of the coupled North American, Greenland, and Eurasian plates from ~95 to 80 Ma.
  11. Faleide, Jan Inge; Tsikalas, F.; Breivik, A. J.; Mjelde, R.; et al. (2008). "Structure and evolution of the continental margin off Norway and the Barents Sea". Episodes. 31 (1): 82. doi:10.18814/epiiugs/2008/v31i1/012. Breakup in the NE Atlantic was preceded by prominent Late Cretaceous-Paleocene rifting. At the onset of this rifting, the area between NW Europe and Greenland was an epicontinental sea covering a region in which the crust had been extensively weakened by previous rift episodes. Ren et al. (2003) suggested onset of rifting at about 81 Ma
  12. Larsen, Lotte Melchior; Rex, D. C.; Watt, W. S.; Guise, P. G. (1999). "40Ar/39Ar Dating of Alkali Basaltic Dykes along the Southwest Coast of Greenland: Cretaceous and Tertiary Igneous Activity along the Eastern Margin of the Labrador Sea" (PDF). Geology of Greenland Survey Bulletin. 184 (184): 19–29. doi:10.34194/ggub.v184.5227. Archived from the original (PDF) on 2016-06-16. Retrieved 2008-06-03. The start of normal velocity ocean floor spreading in the Labrador Sea took place in the Paleocene, around geomagnetic chrons C27-C28 (61–63 Ma) and was accompanied by a burst in volcanic activity, where large amounts of tholeiitic picrites and basalts were erupted onto the continental margins of West Greenland and Labrador
  13. Chalmers, J. A.; Pulvertaft, T.C.R. (1 January 2001). "Development of the continental margins of the Labrador Sea: a review". Geological Society, London, Special Publications. 187 (1): 77–105. Bibcode:2001GSLSP.187...77C. doi:10.1144/GSL.SP.2001.187.01.05. S2CID 140632779. The Labrador Sea is a small oceanic basin that developed when the North American and Greenland plates separated. An initial period of stretching in Early Cretaceous time formed sedimentary basins now preserved under the continental shelves and around the margins of the oceanic crust. The basins subsided thermally during Late Cretaceous time and a second episode of tectonism took place during latest Cretaceous and early Paleocene time, before the onset of sea-floor spreading in mid-Paleocene time.
  14. Lundin, Erik R.; Anthony G. Doré (2005). Fixity of the Iceland "hotspot" on the Mid-Atlantic Ridge: Observational evidence, mechanisms, and implications for Atlantic volcanic margins. pp. 627–651. doi:10.1130/0-8137-2388-4.627. ISBN 978-0-8137-2388-4. {{cite book}}: |journal= ignored (help)
  15. Saunders, A.D.; S. Drachev; M.K. Reichow (2005). "Tracking the Iceland Plume across the Arctic Ocean" (PDF). Geophysical Research Abstracts. 7. Archived (PDF) from the original on 2013-12-17. Retrieved 2013-12-17. It is widely assumed that Iceland sits above a mantle plume or hotspot. Plate reconstructions place the plume beneath what is now northeastern Canada at about 80 Ma. This correlates with an episode of basaltic volcanism in the Queen Elizabeth Islands, dated at around 90 Ma. The aseismic Alpha Ridge is bathymetrically linked to northern Ellesmere Island, and extends northwards beneath the Arctic Ocean.
  16. Tegner, C; Duncan, R; Bernstein, S; Brooks, C; Bird, D; Storey, M (15 March 1998). "40Ar/39Ar geochronology of Tertiary mafic intrusions along the East Greenland rifted margin: Relation to flood basalts and the Iceland hotspot track". Earth and Planetary Science Letters. 156 (1–2): 75–88. Bibcode:1998E&PSL.156...75T. doi:10.1016/S0012-821X(97)00206-9. The East Greenland Tertiary Igneous Province includes the largest exposed continental flood basalt sequence within the North Atlantic borderlands. Plate-kinematic models indicate the axis of the ancestral Iceland mantle plume was located under Central Greenland at ~60 Ma and subsequently crossed the East Greenland rifted continental margin.
  17. Riisager, Janna; Riisager, Peter; Pedersen, Asger Ken (September 2003). "Paleomagnetism of large igneous provinces: case-study from West Greenland, North Atlantic igneous province". Earth and Planetary Science Letters. 214 (3–4): 409–425. Bibcode:2003E&PSL.214..409R. doi:10.1016/S0012-821X(03)00367-4.
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  21. Williamson, I. T.; Bell, B. R. (3 November 2011). "The Palaeocene lava field of west-central Skye, Scotland: Stratigraphy, palaeogeography and structure". Transactions of the Royal Society of Edinburgh: Earth Sciences. 85 (1): 39–75. doi:10.1017/S0263593300006301. S2CID 131299688.
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