globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.12.027
论文题名:
Cause of Upper Triassic climate crisis revealed by Re-Os geochemistry of Boreal black shales
作者: Xu G.; Hannah J.L.; Stein H.J.; Mørk A.; Vigran J.O.; Bingen B.; Schutt D.L.; Lundschien B.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 395
起始页码: 222
结束页码: 232
语种: 英语
英文关键词: Kong Karls Land ; Ladinian-Carnian boundary ; Re-Os geochemistry ; Svalbard ; Svalis Dome ; Triassic
英文摘要: The Triassic Period is bracketed by two of the 'big five' Phanerozoic mass extinctions. Though long viewed as a period of climatic stability, emerging data suggest multiple climatic swings and at least one severe ecological crisis. Linking these climatic instabilities with probable causes is hampered by poor age control within the Triassic time scale. Here we present new Re-Os ages for shale sections straddling Middle-Upper Triassic stage boundaries. Nominal Re-Os isochron ages of 236.6 and 239.3Ma for the top and base of the Ladinian (upper Middle Triassic) bring absolute time into the contentious Triassic time scale, and place the beginning of the Late Triassic about 12m.y. earlier than previously assigned. A marked decrease in initial 187Os/188Os in Upper Ladinian shale records input from Wrangellian flood basalts - an instigator in the Carnian (Late Triassic) Pluvial Event and accompanying radiation of key fossil groups (e.g., dinosaurs and calcareous nanoplankton). An absolute time scale is proposed for the Anisian-Ladinian-Carnian boundaries based on Re-Os geochronology. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69470
Appears in Collections:过去全球变化的重建

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作者单位: Colorado State University, Fort Collins, CO 80523-1482, United States; Geological Survey of Norway, 7491 Trondheim, Norway; CEED, University of Oslo, 0316 Oslo, Norway; SINTEF Petroleum Research, NO-7465 Trondheim, Norway; Norwegian University of Sciences and Technology, NO-7491 Trondheim, Norway; Department of Geosciences, Colorado State University, Fort Collins, CO 80523-1482, United States; Norwegian Petroleum Directorate, NO-4003 Stavanger, Norway

Recommended Citation:
Xu G.,Hannah J.L.,Stein H.J.,et al. Cause of Upper Triassic climate crisis revealed by Re-Os geochemistry of Boreal black shales[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,395
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