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学科主题: Geochemistry & Geophysics
题名: Paleomagnetism of Jurassic sandstones from Yangtze fold belt and its implications for the fold belt curvature
作者: Han, YL ; Xu, CH ; Zhou, ZY ; Tan, XD
通讯作者: maizehan8@163.com ; xdtan@scsio.ac.cn
关键词: Yangtze fold belt ; Jurassic ; Paleomagnetism ; Orocline
刊名: CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
发表日期: 2009
卷: 52, 期:12, 页:3072-3082
收录类别: sci
部门归属: [Han Yu-Lin; Tan Xiao-Dong] Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Han Yu-Lin] Chinese Acad Sci, Grad Univ, Coll Earth Sci, Beijing 100049, Peoples R China; [Xu Chang-Hai; Zhou Zu-Yi] Tongji Univ, Sch Ocean & Earth Sci, Shanghai 200092, Peoples R China
项目归属: 海洋地质
摘要: To promote our knowledge about the origin of the difference in fold axis strikes between upper and middle Yangtze fold belt, we conducted a paleomagnetic study of Middle and Late Jurassic sandstones from Wanzhou and Yunyang County, Chongqing City, a transition zone between the upper and middle Yangtze fold belt. Stepwise thermal demagnetization isolated two components. The low temperature components (LTC) were isolated from all the samples and overprinted by recent geomagnetic field. The high temperature components (HTC) isolated from the Middle and I-ate Jurassic samples from Wanzhou County were also overprinted by recent geomagnetic field. Stepwise unfolding indicates that the maximum precision parameter of HTC isolated from the Late Jurassic samples from Yunyang County is achieved at 33.8% unfolding. The best-clustered HTC mean direction is D = 19.1 degrees, I = 48.9 degrees (alpha(95) = 6.3 degrees), corresponding to a paleopole at 73.5 degrees N, 198.2 degrees E (dp = 5.5 degrees, dm = 8.3 degrees). Compared with the Cretaceous reference paleopole, it reveals that Yunyang County has experienced a clockwise rotation of 7.7 degrees+/-6.1 degrees at the late stage of folding. Combined with published data, our new results support a general orocline in the middle Yangtze fold belt, most probably caused by indentation of NCB into SCB. However, the curvature in the transition zone of upper and middle Yangtze fold belt could be due to strain partitioning in the course of NW directed subduction of the Pacific plate rather than oroclinal bedding.
原文出处: 查看原文
WOS记录号: WOS:000273364200016
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4586
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Han, YL; Xu, CH; Zhou, ZY; Tan, XD.Paleomagnetism of Jurassic sandstones from Yangtze fold belt and its implications for the fold belt curvature,CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(12):3072-3082
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