期刊
GEOTECTONICS
卷 49, 期 1, 页码 3-26出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S0016852115010057
关键词
geodynamics; collision; South Anyui Suture; ophiolites; turbidite; island arc; Paleozoic; Mesozoic
资金
- Rosnedra-RAS State contract Plate-tectonic reconstructions and models of stress state of the lithosphere in Arctic Region in connection with expansion of the outer boundary of continental shelf of the Russian Federation
- Russian Foundation for Basic Research [11-05-00074, 14-05-00031]
- Council for Grants of the President of the Russian Federation [NSh-2981.2014.5]
The South Anyui Suture separates the structures of the Chukotka and Verkhoyansk-Kolyma Fold Areas. The suture consists of ophiolites, island-arc rocks, deformed Upper Triassic and Upper Jurassic-Lower Cretaceous turbidites, and accretionary-type terrigenous melange with blocks of oceanic crust. Two main stages in the geological history of the South Anyui Suture are distinguished: (1) the oceanic stage (Paleozoic-onset of Late Jurassic), when the vast Protoarctic ocean with ensimatic island arcs existed, and (2) the collisional stage (Volgian Age-Early Cretaceous) that started with the transformation of the ocean into the residual and closing South Anyui turbidite basin and was completed by the formation of a fold-nappe structure in the Hauterivian-Barremian. In the course of collision, the oceanic and island complexes were thrust to the north over the passive margin of Chukchi Peninsula. The thrusting was followed by the formation of south-vergent retrocharriages and then by final strike-slip faulting. In the Aptian-Albian, collision gave way to extension with the formation of metamorphic cores and superposed orogenic basins.
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