藏南冈底斯岩浆带中段曲水韧性剪切带的变形特征及其年代学约束

孟元库; 许志琴; 马士委; 杨斐斐; 马绪宣

doi:10.3799/dqkx.2016.090

Volume 41 Issue 7

Jul. 2016

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Article Navigation > Earth Science > 2016 > 41(7): 1081-1098

Meng Yuanku, Xu Zhiqin, Ma Shiwei, Yang Feifei, Ma Xuxuan, 2016. Deformational Characteristics and Geochronological Constraints of Quxu Ductile Shear Zone in Middle Gangdese Magmatic Belt, South Tibet. Earth Science, 41(7): 1081-1098. doi: 10.3799/dqkx.2016.090

Citation:

Meng Yuanku, Xu Zhiqin, Ma Shiwei, Yang Feifei, Ma Xuxuan, 2016. Deformational Characteristics and Geochronological Constraints of Quxu Ductile Shear Zone in Middle Gangdese Magmatic Belt, South Tibet. Earth Science, 41(7): 1081-1098. doi: 10.3799/dqkx.2016.090

Citation:

Meng Yuanku, Xu Zhiqin, Ma Shiwei, Yang Feifei, Ma Xuxuan, 2016. Deformational Characteristics and Geochronological Constraints of Quxu Ductile Shear Zone in Middle Gangdese Magmatic Belt, South Tibet. Earth Science, 41(7): 1081-1098. doi: 10.3799/dqkx.2016.090

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Deformational Characteristics and Geochronological Constraints of Quxu Ductile Shear Zone in Middle Gangdese Magmatic Belt, South Tibet

doi: 10.3799/dqkx.2016.090

Meng Yuanku^{1,2
,},
Xu Zhiqin^{2
,
,},
Ma Shiwei²,
Yang Feifei³,
Ma Xuxuan²

1.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
China National Gold Group Gold Jewellery Co., Ltd., Beijing 100011, China

Received Date: 2015-08-07
Publish Date: 2016-07-15

Abstract

Abstract

The systematic kinematic and dynamic researches of Jigong-Sefu ductile shear zone not only have theoretical significance for the orogenic tectonics, but also advance geological studies of the middle-southern segments of the Tibetan plateau. Quxu ductile shear zone, a vital part of geological structures of Quxu batholith in Gangdese magmatic belt, has experienced large-scale structural deformations featuring with ductile strike-slip shearing, predominantly of dextral shearing since Cenozoic (top to the east). Based on outcrop observations of structural schist, protomylonite, mylonite and felsic veins and thin section analyses as well as quartz EBSD fabric testing, one stage of ductile deformation was identified in the Quxu shear zone. It is found by mineral deformation geothermometer of quartz-feldspar and quartz EBSD fabric analyses that the shear zone is characterized by middle temperature deformations with 500-550 ℃ (from high greenschist facies to amphibolite facies). Structural deformation of the Quxu shear zone observed in South Tibet reveals that the asymmetric folds, structural lenses, σ porphyroclast, S-C fabrics and boudinages are good indicators, which suggest a dextral strike-slip shearing. Average values of 34 mylonitic foliations and 9 stretching lineation are 355°∠70° and 95°∠8°. Moreover, two kinds of granitic veins were identified in the Quxu shear zone. Combined with field occurrence, microstructures, zircon CL features and geochemistry of the felsic veins, we interpret that the two kinds of granitic veins are syn-tectonic shearing intrusions, whose ages can make an accurate geochronological constraint on the formation of the Quxu shear zone. LA-ICP-MS zircon dating of the granitic veins yields ages of 38.67±0.88 Ma and 35.05±0.29 Ma, respectively, further indicating that the Quxu shear zone started at 35-38 Ma (Priabonian stage of Eocene). The shearing time is consistent with that of the late stage of the Indian-Asian plate collision. Therefore, it is concluded that the Quxu shear zone might be related to continuous northward subduction of the Indian plate, corresponding to tectonic stress relation and an intra-continental deformation event.
- Quxu ductile shear zone,
- granitic mylonite,
- structural characteristics,
- microstructural analysis,
- quartz fabrics,
- geochronology

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References(99)

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Deformational Characteristics and Geochronological Constraints of Quxu Ductile Shear Zone in Middle Gangdese Magmatic Belt, South Tibet

doi: 10.3799/dqkx.2016.090

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