Structural characterization of and geochronological constraints on;sinistral strike-slip shearing along the southern segment of Chongshan;shear zone, western Yunnan

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	Structural characterization of and geochronological constraints on;sinistral strike-slip shearing along the southern segment of Chongshan;shear zone, western Yunnan
	Tang Yuan 2; Yin FuGuang ; Wang LiQuan ; Wang DongBing ; Liao ShiYong ; Sun ZhiMing ; Sun Jie
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:4 页码:1311-1324
关键词	Chongshan shear zone Structural characterization Microstructural analysis Quartz fabrics Geochronological constraints
ISSN号	1000-0569
英文摘要	As the important boundary between Baoshan block and Lanping-Simao basin, the Chongshan shear zone has undergone multi-stage tectonic evolution in Cenozoic. The most obvious structural deformation along the shear zone shows large-scale ductile strike-slip shearing, which is characterized by a dextral-dominated strike-slip shearing in northern segment and a sinistral strike-slip shearing in southern segment. Based on macro- and micro-structural observations and fabric analysis of quartz in the deformed rocks, two stages of ductile deformation in the southern segment of Chongshan shear zone have been established in this paper. During the first stage (D1), the deformation along the Chongshan belt is dominated by contractional deformation under pure shearing at high temperature conditions (550 similar to 650 degrees C), characterized by symmetrical folds, boudinages, tectonic lenses and symmetrical patterns of quartz c-axis fabrics. The second stage deformation (D2) is characterized by sinistral strike-slip shearing along the shear zone under simple shearing, showing highly developed foliation and/or lineation and various mylonites related to the strike-slip shearing. In addition, it can be found that some tourmaline-bearing granitic dykes are intensely developed in the Chongshan shear zone. According to the temporal relationships between granitic dykes and shearing, we interpret such granitic dykes are syn-shearing intrusions which account for crystallization of anatectic magma formed during the early stage of sinistral ductile strike-slip shearing. In this paper, two samples of those granitic dykes in the Chongshan shear zone were chosen for LA-ICP-MS zircon U-Pb dating, giving ages of 21. 7 +/- 0. 3Ma and 22. 7 +/- 0. 3Ma respectively. The zircon U-Pb ages of these syn-shearing granitic dykes reveal that the sinistral ductile strikeslip shearing along the southern segment of Chongshan shear zone started at about (or a little earlier than) 22Ma.
学科主题	构造地质学
WOS关键词	NAM-DINH AREA ; AR-40/AR-39 DATING CONSTRAINT ; LEFT-LATERAL MOVEMENT ; EARTH-SCIENCES 18 ; WANG ET-AL. ; U-PB AGES ; LA-ICP-MS ; AILAO-SHAN ; SE ; ASIA ; CONTINENTAL EXTRUSION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000318260300017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39977]
专题	中国地质调查局成都地质调查中心
作者单位	1.Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China. 2.中国地质调查局成都地质调查中心
推荐引用方式 GB/T 7714	Tang Yuan,Yin FuGuang,Wang LiQuan,et al. Structural characterization of and geochronological constraints on;sinistral strike-slip shearing along the southern segment of Chongshan;shear zone, western Yunnan[J]. ACTA PETROLOGICA SINICA,2013,29(4):1311-1324.
APA	Tang Yuan.,Yin FuGuang.,Wang LiQuan.,Wang DongBing.,Liao ShiYong.,...&Sun Jie.(2013).Structural characterization of and geochronological constraints on;sinistral strike-slip shearing along the southern segment of Chongshan;shear zone, western Yunnan.ACTA PETROLOGICA SINICA,29(4),1311-1324.
MLA	Tang Yuan,et al."Structural characterization of and geochronological constraints on;sinistral strike-slip shearing along the southern segment of Chongshan;shear zone, western Yunnan".ACTA PETROLOGICA SINICA 29.4(2013):1311-1324.