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 Gillian R., Nikishin Anatoly M., Aleshina Ksenia F., Rodina Elizaveta A.
Журнал: Tectonophysics
Том: 880
Год издания: 2024
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 230317
DOI: 10.1016/j.tecto.2024.230317
Аннотация: Geological understanding of the NE Atlantic and Arctic regions has increased greatly over the last two decades,revealing remarkable similarities. Continental extension in both regions onset during pausing or cessation ofadjacent orogenies – the Verkhoyansk-Chukotka and Alpine orogenies – which relaxed compressional stressesand permitted extension. Severe extension accompanied by high-volume magmatism did not onset abruptly butwas the culmination of long-term, regional tectonic and magmatic unrest. It was complex and piecemeal, withextension and volcanism occurring along multiple axes simultaneously, a process still ongoing in Iceland today.Large Igneous Province emplacement did not drive breakup but occurred as a consequence of continentalextension. The High Arctic Large Igneous Province did not progress to breakup. As a result, much of the ArcticOcean is floored by hyper-extended continental crust overlain by seaward-dipping reflectors. This crust resemblesthe passive margins of the NE Atlantic. The Alpha-Mendeleev Rise in the Arctic Ocean is a double-sidedpassive margin underlain by hyper-extended continental crust draped with seaward-dipping reflectors. A similarstructure has been proposed for the Greenland-Iceland-Faroe Ridge. If correct, present-day volcanism in Icelandis building SDRs today. Up to ~50% of the NE Atlantic Ocean oceanward of the continental shelves is likelyunderlain by at least some continental crust. For the Arctic Ocean this figure is ~80%. Similar structures arefound elsewhere, including the Madagascar Channel, the NW Indian Ocean, and the South Atlantic. These newideas suggest promising directions of future study including assessing the true extent of continental crust in theoceans globally.
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