An early Jurassic dextral strike-slip system in southern South China and its tectonic significance

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	An early Jurassic dextral strike-slip system in southern South China and its tectonic significance
	Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
刊名	JOURNAL OF GEODYNAMICS
	2013
卷号	63 页码:27-44
关键词	South China Guangning-Bobai fault zone Dextral ductile shear Early Jurassic
ISSN号	0264-3707
通讯作者	caijianxin.student@sina.com
中文摘要	Ductile shear structure of the Guanging-Bobai fault belt in the SW part of the Qin-Hang belt, South China, has been investigated and interpreted in terms of radiometric dating data. A series of ductile shear zones occurs within the fault belt with deformation and metamorphic features indicative of formation under medium temperature and pressure conditions. The foliation such formed is steeply dipping and bears a gently plunging lineation, which along with the dextral kinematic indicators determines a broad NE-SW-trending dextral strike-slip regime responsible for the development of these shear zones. Field overprinting relationships indicate that this dextral shear is pre-dated by the Indosinian (P-2-T) NNE-verging thrusting and post-dated by the Yanshanian J(2)-K-2) SE-verging thrusting, and thus occurred during a transitional period between the two orogenies. Ar-40-Ar-39 radiometric dating on muscovite from mylonites further constrains timing of the dextral shear to the Early Jurassic (187-193 Ma). Based on the coeval tectonic framework of eastern Asia, we propose here that the dextral strike-slip system was initiated by the far-field oblique stress field from the incipient subduction of the Izanagi oceanic plate. An offset continental margin of the South China plate may have been created in response to this transcurrent movement along the fault belt, dissecting and displacing not only a relict Caledonian foreland basin, but also an Indosinian magmatic belt. (C) 2012 Elsevier Ltd. All rights reserved.
学科主题	Geochemistry & Geophysics
资助信息	I will express my appreciation to engineer Huo-Dai Zhang for helpful discussion on Mesozoic to Cenozoic tectonics of South China, to Prof. Hua-Ning Qiu for analytical support in ⁴⁰Ar-³⁹Ar dating, and to two anonymous reviews for constructive advises on improving the manuscript. This work is partly supported by marginal sea opening foundation MSGL 12-06.
原文出处	PERGAMON-ELSEVIER SCIENCE LTD
语种	英语
WOS记录号	WOS:000313998200003
公开日期	2015-01-22
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/11145]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China. An early Jurassic dextral strike-slip system in southern South China and its tectonic significance[J]. JOURNAL OF GEODYNAMICS,2013,63:27-44.
APA	Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.(2013).An early Jurassic dextral strike-slip system in southern South China and its tectonic significance.JOURNAL OF GEODYNAMICS,63,27-44.
MLA	Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China."An early Jurassic dextral strike-slip system in southern South China and its tectonic significance".JOURNAL OF GEODYNAMICS 63(2013):27-44.