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- W1982391444 abstract "The Coast Mountains orogen is thought to have formed as a result of accretion of the Alexander and Wrangellia terranes against the western margin of the Stikine and YukonTanana terranes, but the nature and age of accretion remain controversial. The Chatham Sound area, which is located along the west flank of the Coast Mountains near the Alaska British Columbia border, displays a wide variety of relations that bear on the nature and age of the boundary between inboard and outboard terranes. Geologic and UPb geochronologic studies in this area reveal a coherent but deformed and metamorphosed sequence of rocks belonging to the YukonTanana terrane, including pre-mid-Paleozoic marble, schist, and quartzite, mid-Paleozoic orthogneiss and metavolcanic rocks, and upper Paleozoic metaconglomerate and metavolcanic rocks. These rocks are overlain by Middle Jurassic volcanic rocks (Moffat volcanics) and Upper Jurassic Lower Cretaceous strata of the Gravina basin, both of which also overlie Triassic and older rocks of the Alexander terrane. This overlap relationship demonstrates that the Alexander and Wrangellia terranes were initially accreted to the margin of inboard terranes during or prior to mid-Jurassic time. Accretion was apparently followed by Late Jurassic Early Cretaceous extensiontranstension to form the Gravina basin, left-slip along the inboard margin of AlexanderWrangellia, mid-Cretaceous collapse of the Gravina basin and final structural accretion of the outboard terranes, and early Tertiary dip-slip motion on the Coast shear zone." @default.
- W1982391444 created "2016-06-24" @default.
- W1982391444 creator A5041250552 @default.
- W1982391444 date "2001-11-01" @default.
- W1982391444 modified "2023-09-24" @default.
- W1982391444 title "Geology of the Chatham Sound region, southeast Alaska and coastal British Columbia" @default.
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- W1982391444 doi "https://doi.org/10.1139/e01-040" @default.
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