THE REMARKABLE PARALLELS BETWEEN THE NORTH EAST ATLANTIC AND  ARCTIC REGIONS

Foulger, G.R.; Nikishin, A.M.; Aleshina, K.F.; Rodina, E.A.

Авторы: Foulger G.R., Nikishin A.M., Aleshina K.F., Rodina E.A.
Журнал: SSRN Electronic Journal
Год издания: 2023
Издательство: Elsevier B.V.
Местоположение издательства: Netherlands
DOI: 10.2139/ssrn.4559029
Аннотация: Geological understanding of the NE Atlantic and Arctic Oceans has increased greatly over the last two decades. Continental breakup in the two regions occurred in the wake of pausing or cessation of the Verkhoyansk-Chukotka and Alpine orogenic collisions, which relaxed compressional stresses and permitted extension. Breakup, with attendant high-volume magmatism was not abrupt but the culmination of long-term, regional tectonic and magmatic unrest. It was complex and piecemeal, with multiple axes extending simultaneously and forming microcontinents, a process still ongoing in Iceland today. Structure, tectonics and magmatic rates grade from north to south. Large Igneous Province emplacement did not drive breakup. The High Arctic Large Igneous Province accompanied extension that did not progress to breakup. Much of it comprises seaward-dipping reflector units that overlie hyperextended continental crust in areas that did not go on to develop seafloor spreading. Both oceans contain considerable continental crust. Up to ~ 50% of the northeast Atlantic Ocean oceanward of the continental shelves is underlain by some degree of continental crust. For the Arctic Ocean this figure is ~ 80%. The Alpha-Mendeleev Rise is hyper-extended continental crust draped with seaward-dipping reflectors and is a close analog of the Greenland--Iceland-Faroe Ridge. The tectonic, structural and magmatic characteristics that the northeast Atlantic and Arctic Oceans share also occur elsewhere in the oceans and on land. Future promising directions of research include the degree of structural control in the Arctic Ocean, classification of the Arctic seaward-dipping reflectors, the deep structure beneath the northeast Atlantic Inner-seaward-dipping reflectors and the Greenland-Iceland-Faroe Ridge, the processes that induce Large Igneous Province formation and the distribution and influence of continental crust in the oceans
Добавил в систему: Никишин Анатолий Михайлович

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THE REMARKABLE PARALLELS BETWEEN THE NORTH EAST ATLANTIC AND ARCTIC REGIONSстатья

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