气候变化领域集成服务门户(CCPortal): Structural, 40Ar/39Ar Geochronological and Rheological Feature Analysis of the Guoxuepu Shear Zone: Indications for the Jitang Metamorphic Complex in the Northern Lancangjiang Zone

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DOI	10.1111/1755-6724.15119
	Structural, 40Ar/39Ar Geochronological and Rheological Feature Analysis of the Guoxuepu Shear Zone: Indications for the Jitang Metamorphic Complex in the Northern Lancangjiang Zone
	Feng, Yipeng; Wang, Genhou; Wang, Shulai; Li, Dian; Wang, Huan; Lu, Yang; Liu, Han; Zhang, Peilie
发表日期	2024
ISSN	1000-9515
EISSN	1755-6724
起始页码	98
结束页码	1
卷号	98 期号:1
英文摘要	The Jitang metamorphic complex is key to studying the tectonic evolution of the Northern Lancangjiang zone. Through structural-lithological mapping, structural analysis and laboratory testing, the composition of the Jitang metamorphic complex was determined. The macro- and microstructural analyses of the ductile detachment shear zone (Guoxuepu ductile shear zone, 2-4 km wide) between the metamorphic complex and the overlying sedimentary cap show that the shear sense of the ductile shear zones is top-to-the-southeast. The presence of various deformation features and quartz C-axis electron backscatter diffraction (EBSD) fabric analysis suggests multiple deformation events occurring at different temperatures. The average stress is 25.68 MPa, with the strain rates (epsilon) ranging from 9.77x10(-14) s(-1) to 6.52x10(-16) s(-1). The finite strain of the Guoxuepu ductile shear zone indicates an elongated strain pattern. The average kinematic vorticity of the Guoxuepu ductile shear zone is 0.88, implying that the shear zone is dominated by simple shear. The muscovite selected from the protomylonite samples in the Guoxuepu ductile shear zone yields a Ar-40-Ar-39 age of 60.09 +/- 0.38 Ma. It is suggested that, coeval with the initial Indo-Eurasian collision, the development of strike-slip faults led to a weak and unstable crust, upwelling of lower crust magma, then induced the detachment of the Jitang metamorphic complex in the Eocene.
英文关键词	Ar-40/Ar-39 dating; strain pattern; vorticity; EBSD; Guoxuepu shear zone; Jitang metamorphic complex
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001159112100018
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301704
作者单位	China University of Geosciences; Chengdu University of Technology; China Geological Survey; Chengdu Center, China Geological Survey
推荐引用方式 GB/T 7714	Feng, Yipeng,Wang, Genhou,Wang, Shulai,et al. Structural, 40Ar/39Ar Geochronological and Rheological Feature Analysis of the Guoxuepu Shear Zone: Indications for the Jitang Metamorphic Complex in the Northern Lancangjiang Zone[J],2024,98(1).
APA	Feng, Yipeng.,Wang, Genhou.,Wang, Shulai.,Li, Dian.,Wang, Huan.,...&Zhang, Peilie.(2024).Structural, 40Ar/39Ar Geochronological and Rheological Feature Analysis of the Guoxuepu Shear Zone: Indications for the Jitang Metamorphic Complex in the Northern Lancangjiang Zone.ACTA GEOLOGICA SINICA-ENGLISH EDITION,98(1).
MLA	Feng, Yipeng,et al."Structural, 40Ar/39Ar Geochronological and Rheological Feature Analysis of the Guoxuepu Shear Zone: Indications for the Jitang Metamorphic Complex in the Northern Lancangjiang Zone".ACTA GEOLOGICA SINICA-ENGLISH EDITION 98.1(2024).