globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116591
论文题名:
Late Ediacaran paleogeography of Avalonia and the Cambrian assembly of West Gondwana
作者: Wen B.; Evans D.A.D.; Anderson R.P.; McCausland P.J.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 552
语种: 英语
中文关键词: Avalonia terrane ; Clymene Ocean ; paleomagnetism ; true polar wander ; West Gondwana
英文关键词: Metals ; Apparent motion ; Final assembly ; Newfoundlands ; Paleogeography ; Paleomagnetic record ; Tectonic evolution ; True Polar Wander ; West Gondwana ; Geomagnetism ; Avalonia ; Cambrian ; Ediacaran ; Gondwana ; paleogeography ; paleomagnetism ; polar wandering ; Rodinia ; Canada ; Laurentian Mountains ; Newfoundland ; Newfoundland and Labrador ; Quebec [Canada] ; West Africa
英文摘要: The latest Proterozoic tectonic evolution of Avalonia, one of the largest peri-Gondwanan terranes, bears on the issue of Gondwana amalgamation during the transition from Rodinia to Pangea. New paleomagnetic results from mid–late Ediacaran strata in the Newfoundland sector of Avalonia confirm substantial apparent motion of that terrane between ca. 590 and 560 Ma, consistent with a true polar wander interpretation for that interval. When the Avalonian poles are mapped onto complementary paleomagnetic records from West Africa and Laurentia, the Avalonia terrane may occupy any of four possible positions, all of which are far-removed from those cratons. Choosing the most kinematically parsimonious location leading toward Gondwana assembly, we find that Avalonia was most likely proximal to Amazonia during the Ediacaran–Cambrian transition, with a substantial (∼3000 km) separation between Amazonia and West Africa at that time. Our results thus favor the existence of a wide Clymene Ocean and subsequent Cambrian final assembly of West Gondwana, providing a key snapshot onto the evolving Rodinia-Gondwana supercontinental transition. © 2020 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/165344
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作者单位: Department of Earth and Planetary Sciences, Yale University, 210 Whitney Avenue, New Haven, CT 06520-8109, United States; State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; All Souls College, University of Oxford, Oxford, OX1 4AL, United Kingdom; Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; Western Paleomagnetic and Petrophysical Laboratory, Department of Earth Sciences, University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada

Recommended Citation:
Wen B.,Evans D.A.D.,Anderson R.P.,et al. Late Ediacaran paleogeography of Avalonia and the Cambrian assembly of West Gondwana[J]. Earth and Planetary Science Letters,2020-01-01,552
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