气候变化领域集成服务门户(CCPortal): Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone

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DOI	10.1002/2016GC006520
	Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone
	Zhang, B.; Yin, C. Y.; Zhang, J. J.; Wang, J. M.; Zhong, D. L.; Wang, Y.; Lai, Q. Z.; Yue, Y. H.; Zhou, Q. Y.
通讯作者	Zhang, B (通讯作者)
发表日期	2017
ISSN	1525-2027
起始页码	400
结束页码	433
卷号	18 期号:1
英文摘要	The Cenozoic Xuelong Shan antiformal dome is located along the northern segment of the Ailao Shan-Red River shear zone in Yunnan, China. Subhorizontal foliation in the gneiss core is recognized, representing a broad top-to-NE shear initiated under amphibolite facies conditions and propagating into greenschist facies in the mantling schist and strike-slip shear zone. Microfabrics of crystallographic-preferred orientations (CPOs) in quartz suggest that the deformation temperatures increased with increasing structural depth from the upper crust (300-500 degrees C) in the mantling schist to the midcrust (15 km or more, 650 degrees C) in the gneissic core. This trend is mirrored by variations in the metamorphic grade of the syn-kinematic mineral assemblages and microstructures, which range from garnet+amphibole+biotite+sillimanite+rutile+feldspar in the core to garnet+staurolite+biotite+epidote+muscovite within the limb units. The dome experienced the following deformation history: (1) a broad top-to-NE shear in the subhorizontal foliation of the gneiss core during the first stage of deformation (D1); (2) opposing reverse-sense shear along the two schist limbs of the dome during contraction-related doming (D2-D3); (3) sinistral strike-slip shearing within the eastern limb (D4); and (4) extensional deformation (D5). The structural-thermal patterns suggest the antiformal dome formation was roughly coeval with top-to-NE ductile shearing in the midcrust of Tibet at 32 Ma or earlier. A major implication is that there was a phase of contractional ductile deformation in the region prior to the initiation of strike-slip deformation.
关键词	METAMORPHIC CORE COMPLEXES SOUTHERN TIBET GNEISS DOMES PREFERRED ORIENTATIONS DETACHMENT FAULTS AR-40/AR-39 GEOCHRONOLOGY DEFORMATION TEMPERATURES CONTINENTAL EXTRUSION PLASTIC-DEFORMATION FABRIC DEVELOPMENT
英文关键词	gneiss dome; strike-slip; midcrustal shearing; quartz CPO; Ailao Shan-Red River shear zone; Eastern Himalayan Syntaxis
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000395186600023
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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/258953
推荐引用方式 GB/T 7714	Zhang, B.,Yin, C. Y.,Zhang, J. J.,et al. Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone[J]. 中国科学院青藏高原研究所,2017,18(1).
APA	Zhang, B..,Yin, C. Y..,Zhang, J. J..,Wang, J. M..,Zhong, D. L..,...&Zhou, Q. Y..(2017).Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,18(1).
MLA	Zhang, B.,et al."Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 18.1(2017).