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学科主题: Geochemistry & Geophysics
题名: Optimization of apparent polar wander paths: An example from the South China plate
作者: Gilder, SA ; Tan, XD ; Bucher, H ; Kuang, GD ; Yin, JR
通讯作者: gilder@lmu.de
关键词: Paleomagnetism ; Tectonics ; Permian ; Triassic ; China
刊名: PHYSICS OF THE EARTH AND PLANETARY INTERIORS
发表日期: 2008
卷: 169, 期:40547, 页:166-177
收录类别: sci
部门归属: [Gilder, Stuart A.] Univ Munich, Dept Earth & Environm Sci, D-80333 Munich, Germany; [Tan, Xiaodong] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Bucher, Hugo] Univ Zurich, Inst Palaontol, CH-8006 Zurich, Switzerland; [Kuang, Guodun] Guangxi Bur Geol & Mineral Resources, Nanning 530023, Peoples R China; [Yin, Jiarun] China Univ Geosci, Beijing 100083, Peoples R China
项目归属: 海洋地质
摘要: Paleomagnetically derived apparent polar wander paths form the foundation of quantitative plate tectonic reconstructions. However, deformation leading to vertical axis block rotations displaces paleomagnetic poles away from their original positions, leading to an ambiguity as to which pole, or group of poles, best approximates the "true" reference pole position for a given time. Here we show that the best estimate of the "true" reference pole will match the observed paleolatitude (p lambda) for each point on the plate. This means that the expected p lambda from the "true" reference pole minus the observed p lambda, derived from each individual study, will average to zero. Histogram plots and associated parameters help further discriminate between candidate reference poles when more than one of them fulfills the zero-average requirement within prescribed uncertainty limits. Our analysis of 44 Late Permian to Middle Triassic paleomagnetic poles from the South China plate corroborates previous assumptions that the poles from Sichuan Province best represent the "true" reference for the South China plate. To better understand the age of the rotations, we studied the paleomagnetism of Lower and Upper Triassic rocks from the Shiwandashan region in Guangxi Province. Early Triassic paleomagnetic directions isolated at high temperature demagnetization steps are of dual polarity and pass the fold test. This magnetization component is indistinguishable at 95% confidence limits from Middle Triassic paleomagnetic directions from other parts of Guangxi Province. The corresponding pole for this component lies within the swath of Early to Middle Triassic paleomagnetic poles from the South China plate, confirming that Guangxi has been a part of the South China plate since at least the Early Triassic. Late Triassic paleomagnetic data require further study before their complex magnetizations can be interpreted. (C) 2008 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000260648700017
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4528
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Gilder, SA; Tan, XD; Bucher, H; Kuang, GD; Yin, JR.Optimization of apparent polar wander paths: An example from the South China plate,PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2008,169(40547):166-177
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