The Verkhoyansk Mountains in northeastern Russia have a specific geological age
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Peer-reviewed geological literature establishes that the Verkhoyansk region features specific Paleozoic and Mesozoic rock populations, including Permo-Carboniferous and Cambro-Silurian zircon populations and Permian-Triassic boundary deposits.
The samples of the genus Otoceras, which is an important biostratigraphic marker of the Permian-Triassic boundary deposits of the Boreal realm, were found in the Kobyuma structural and facies zone of the Southern Verkhoyansk region. The features of the geographic and vertical distribution of Otoceras in the northern part of the Southern Verkhoyansk region were considered. The age of Otoceras beds was discussed. In the Verkhoyansk region, the Otoceras beds are divided into Concavum and Boreale zones. In the Tiryakh-Kobyume section of the Kobyuma zone, two close levels with ceratites of the genus Otoceras were revealed. From the first (lower) level, Otoceras aff. gracile Tozer and O. sp. were identified, presumably related to the Concavum zone of the highest part of the Changhsingian stage (Permian, Lopingian Series). At the second (upper) level, a large specimen of the species Otoceras boreale Spath was discovered, which makes it possible to attribute the host deposits to the Boreale zone of the Induan stage base (Lower Triassic). A section interval containing ceratites of the genus Tompophiceras of the Pascoei and Morpheos zones was revealed above the Otoceras beds. Since no own Triassic local stratigraphic scheme has been established in the Kobyuma zone, it is expedient to use the Nekuchan Formation (Induan deposits) of the Allakh-Yun’ zone of the Southern Verkhoyansk region.
To test existing models for the formation of the Amerasian Basin, detrital zircon suites from 12 samples of Triassic sandstone from the circum‐Arctic region were dated by laser ablation‐inductively coupled plasma‐mass spectrometry (ICP‐MS). The northern Verkhoyansk (NE Russia) has Permo‐Carboniferous (265–320 Ma) and Cambro‐Silurian (410–505 Ma) zircon populations derived via river systems from the active Baikal Mountain region along the southern Siberian craton. Chukotka, Wrangel Island (Russia), and the Lisburne Hills (western Alaska) also have Permo‐Carboniferous (280–330 Ma) and late Preca
Miller Department of Geological and Environmental Sciences Stanford University Stanford California USA Jaime Toro Department of Geology and Geography West Virginia University Morgantown West Virginia USA George Gehrels Department of Geosciences University of Arizona Tucson Arizona USA Jeffrey M. Amato Department of Geological Sciences New Mexico State University Las Cruces New Mexico USA Andrei Prokopiev Diamond and Precious Metal Geology Institute, Siberian Branch Russian Academy of Sciences Yakutsk Russia Marianna I. Tuchkova Geological Institute Russian Academy of Sciences Moscow Russia Vyacheslav V.
Akinin Northeast Interdisciplinary Scientific Research Institute Russian Academy of Sciences Magadan Russia Trevor A. Dumitru Department of Geological and Environmental Sciences Stanford University Stanford California USA Thomas E. Moore U.S. Geological Survey Menlo Park California USA Michael P.
Cecile Geological Survey of Canada Calgary, Alberta Canada 書誌事項 公開日 2006-06 権利情報 http://onlinelibrary.wiley.com/termsAndConditions#vor DOI 10.1029/2005tc001830 公開者 American Geophysical Union (AGU) この論文をさがす CiNii Books 説明 <jats:p>To test existing models for the formation of the Amerasian Basin, detrital zircon suites from 12 samples of Triassic sandstone from the circum‐Arctic region were dated by laser ablation‐inductively coupled plasma‐mass spectrometry (ICP‐MS).
The northern Verkhoyansk (NE Russia) has Permo‐Carboniferous (265–320 Ma) and Cambro‐Silurian (410–505 Ma) zircon populations derived via river systems from the active Baikal Mountain region along the southern Siberian craton. Chukotka, Wrangel Island (Russia), and the Lisburne Hills (western Alaska) also have Permo‐Carboniferous (280–330 Ma) and late Precambrian‐Silurian (420–580 Ma) zircons in addition to Permo‐Triassic (235–265 Ma), Devonian (340–390 Ma), and late Precambrian (1000–1300 Ma) zircons. These ages suggest at least partial derivation from the Taimyr, Siberian Trap, and/or east Urals regions of Arctic Russia.
The northerly derived Ivishak Formation (Sadlerochit Mountains, Alaska) and Pat Bay Formation (Sverdrup Basin, Canada) are dominated by Cambrian–latest Precambrian (500–600 Ma) and 445–490 Ma zircons. Permo‐Carboniferous and Permo‐Triassic zircons are absent. The Bjorne Formation (Sverdrup Basin), derived from the south, differs from other samples studied with mostly 1130–1240 Ma and older Precambrian zircons in addition to 430–470 Ma zircons. The most popular plate tectonic model for the origin of the Amerasian Basin involves counterclockwise rotation of the Arctic Alaska–Chukotka microplate away from the Canadian Arctic margin.
The detrital zircon data suggest that the Chukotka part of the microplate originated closer to the Taimyr and Verkhoyansk, east of the Polar Urals of Russia, and not from the Canadian Arctic.</jats:p> 収録刊行物 Tectonics Tectonics 25 (3), 2006-06 American Geophysical Union (AGU) 被引用文献 (1) *注記 読み込み中...
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