The Arctida Craton and Neoproterozoic-Mesozoic orogenic belts of the Circum-Polar region |
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Authors: | N I Filatova V E Khain |
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Institution: | (1) Dept. Geology, University of Rajasthan, 302004 Jaipur, India |
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Abstract: | An attempt is made to characterize an assembly of Arctic tectonic units formed before the opening of the Arctic Ocean. This
assembly comprises the epi-Grenville Arctida Craton (a fragment of Rodinia) and the marginal parts of the Precambrian Laurentia,
Baltica, and Siberian cratons. The cratons are amalgamated by orogenic belts (trails of formerly closed oceans). These are
the Late Neoproterozoic belts (Baikalides), Middle Paleozoic belts (Caledonides), Permo-Triassic belts (Hercynides), and Early
Cretaceous belts (Late Kimmerides). Arctida encompasses an area from the Svalbard Archipelago in the west to North Alaska
in the east. The Svalbard, Barents, Kara, and other cratons are often considered independent Precambrian minicratons, but
actually they are constituents of Arctida subsequently broken down into several blocks. The Neoproterozoic orogenic belt extends
as a discontinuous tract from the Barents-Ural-Novaya Zemlya region via the Taimyr Peninsula and shelf of the East Siberian
Sea to North Alaska as an arcuate framework of Arctida, which separates it from the Baltica and Siberian cratons. The Caledonian
orogenic belt consisting of the Scandian and Ellesmerian segments frames Arctida on the opposite side, separating it from
the Laurentian Craton. The opposite position of the Baikalian and Caledonian orogenic belts in the Arctida framework makes
it possible to judge about the time when the boundaries of this craton formed as a result of its detachment from Rodinia.
The Hercynian orogenic belt in the Arctic Region comprises the Novozemel’sky (Novaya Zemlya) and Taimyr segments, which initially
were an ending of the Ural Hercynides subsequenly separated by a strike-slip fault. The Mid-Cretaceous (Late Kimmerian) orogenic
belt as an offset of Pacific is divergent. It was formed under the effect of the opened Canada Basin and accretion and collision
at the Pacific margins. The undertaken typification of pre-Late Mesozoic tectonic units, for the time being debatable in some
aspects, allows reconstruction of the oceanic basins that predated the formation of the Arctic Ocean. |
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