气候变化领域集成服务门户(CCPortal): Sinistral strike-slip shearing along the Jiali shear zone around the Eastern Himalaya syntaxis region: Evidences for oligocene eastward limited translation of Tibet

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DOI	10.1016/j.jsg.2020.104136
	Sinistral strike-slip shearing along the Jiali shear zone around the Eastern Himalaya syntaxis region: Evidences for oligocene eastward limited translation of Tibet
	Zhang, Bo; Cai, Fulong; Chen, Siyu; Li, Xiaorong; Zhang, Lei
通讯作者	Zhang, B (通讯作者)
发表日期	2020
ISSN	0191-8141
卷号	139
英文摘要	In and around the Eastern Himalaya Syntaxis (EHS), the metamorphic complex and its structural boundaries are key tectonics to investigate the kinematics and thermal evolution of the continental collision. We provide new structural, kinematic and geochronological data along the northeastern boundary of the EHS, namely the Jiali strike-slip shear zone. Structures and various kinematic indicators record sinistral strike-slip shearing in the zone. Based on the microstructural features, crystallographic preferred orientation patterns of quartz and their slip systems, coupled with Raman Spectroscopy of Carbonaceous Materials (RSCM) geothermometry, the ductile sinistral shearing fabrics formed at upper greenschist and amphibolite facies (>500 degrees C). Two hornblende, one muscovite and five biotite separates from the mylonites in the shear zone were dated by the Ar-40/Ar-39 method. A hornblende plateau age of 23.7 Ma is interpreted as representing or being close to the time of sinistral movement. Muscovite and biotite Ar-40/Ar-39 ages from 22.9 to 16.9 Ma represent cooling ages following sinistral shearing. It is concluded on the basis of these data that the Jiali sinistral strike-slip shear zone was active in latest Oligocene. This sinistral movement on the Jiali shear zone is considered to link with the Ailao Shan-Red River shear zone, and form a unique, continuous structural boundary around the EHS. The Jiali-Ailao Shan-Red River sinistral shear zone and Gaoligong dextral shear zone formed a huge conjugate strike-slip shear pair around the EHS to accommodate the N-S shortening corresponding to northward indentation of the folded Indian continent. The conjugate strike-slip shear systems also contribute to transporting Tibet southeastward in a limited scale.
关键词	INDIA-ASIA COLLISION GRANULITE-FACIES METAMORPHISM KARAKORAM FAULT SYSTEM NAMCHE BARWA SYNTAXIS RED-RIVER SOUTHERN TIBET AILAO SHAN CARBONACEOUS MATERIAL WESTERN YUNNAN TRANSPRESSIONAL TECTONICS
英文关键词	Himalayan-Tibetan orogen; Eastern himalayan syntaxis: Jiali shear zone; Sinistral strike-slip; Conjugate strike-slip pair
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000568820800001
来源期刊	JOURNAL OF STRUCTURAL GEOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259731
推荐引用方式 GB/T 7714	Zhang, Bo,Cai, Fulong,Chen, Siyu,et al. Sinistral strike-slip shearing along the Jiali shear zone around the Eastern Himalaya syntaxis region: Evidences for oligocene eastward limited translation of Tibet[J]. 中国科学院青藏高原研究所,2020,139.
APA	Zhang, Bo,Cai, Fulong,Chen, Siyu,Li, Xiaorong,&Zhang, Lei.(2020).Sinistral strike-slip shearing along the Jiali shear zone around the Eastern Himalaya syntaxis region: Evidences for oligocene eastward limited translation of Tibet.JOURNAL OF STRUCTURAL GEOLOGY,139.
MLA	Zhang, Bo,et al."Sinistral strike-slip shearing along the Jiali shear zone around the Eastern Himalaya syntaxis region: Evidences for oligocene eastward limited translation of Tibet".JOURNAL OF STRUCTURAL GEOLOGY 139(2020).