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TitleGeology of Wrangel Island, between Chukchi and East Siberian seas, northeastern Russia
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKos'ko, M K; Cecile, M P; Harrison, J C; Ganelin, V G; Khandoshko, N V; Lopatin, B G
SourceGeological Survey of Canada, Bulletin 461, 1993, 107 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediapaper; on-line; digital
File formatpdf
AreaWrangel Island; Chukchi Sea; East Siberian Sea; Russian Federation
Lat/Long WENS-180.0000 -177.0000 72.0000 70.0000
Lat/Long WENS178.0000 180.0000 72.0000 70.0000
Subjectsstructural geology; tectonics; sedimentology; tectonic setting; tectonic elements; tectonic environments; tectonic evolution; tectonic history; tectonic interpretations; stratigraphic analyses; Upper Silurian; Lower Devonian; Upper Devonian; Lower Carboniferous; Upper Carboniferous; Lower Permian; Upper Permian; Paleogene; Neogene; Pliocene; structural trends; structural interpretations; structural features; zircon dates; uranium lead dates; radiometric dates; stratigraphic correlations; faults, thrust; faults; metamorphic facies; greenschist facies; metamorphism; depositional environment; sandstones; muds; shales; siltstones; gravels; conglomerates; carbonate rocks; sedimentary rocks; Wrangel Complex; Chukotkan Orogeny; Quaternary; Tertiary; Cenozoic; Triassic; Permian; Carboniferous; Devonian; Silurian; Proterozoic
Illustrationssketch maps; photographs; cross-sections; stratigraphic columns
Released1994 01 01; 2013 02 08
AbstractThe oldest unit on Wrangel Island is the Upper Proterozoic Wrangel Complex, a 2000+ m succession of volcanic and clastic sedimentary rocks with small mafic and granitic intrusives and U-Pb crystallization ages of 0.63 to 0.70 Ga. The oldest Paleozoic unit is a 700 m succession of Upper Silurian and Lower Devonian clastic and carbonate strata. These strata are overlain in ascending order by: 1200 m of Devonian clastic rocks; 350 m of Lower Carboniferous clastic rocks, with conglomerate, carbonate and gypsum; 1400 m of Carboniferous carbonate with slate and bioherms; a 750 m thick unit of Permian slate and limestone, locally with olistostrome and breccia; 800 to 1500 m of Triassic flysch; and lastly, tens of metres of undeformed Tertiary and Quaternary clastics. All rock units of Proterozoic to Triassic age were pentratively deformed into north-verging structures, and metamorphosed to greenschist facies, during the Mesozoic Chukotkan Orogeny (Middle Jurassic to Early Cretaceous). Some aspects of Wrangel Island's tectonic history in the circum-Canada Basin are peculiar. The most important are: Late Proterozoic magmatism; inferred latest Proterozoicþearly Paleozoic orogenesis; Triassic flysch; Chukotkan deformation; and late Early Cretaceous overlap of all northeastern Russian terranes by the Upper Cretaceous OkhotskþChukotsk volcanic belt.

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