北喜马拉雅E-W向伸展变形时限:来自藏南错那洞穹隆Ar-Ar年代学证据

付建刚; 李光明; 王根厚; 张林奎; 梁维; 张志; 董随亮; 黄勇

doi:10.3799/dqkx.2018.530

Volume 43 Issue 8

Aug. 2018

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Article Navigation > Earth Science > 2018 > 43(8): 2638-2650

Fu Jiangang, Li Guangming, Wang Genhou, Zhang Linkui, Liang Wei, Zhang Zhi, Dong Suiliang, Huang Yong, 2018. Timing of E-W Extension Deformation in North Himalaya: Evidences from Ar-Ar Age in the Cuonadong Dome, South Tibet. Earth Science, 43(8): 2638-2650. doi: 10.3799/dqkx.2018.530

Citation:

Fu Jiangang, Li Guangming, Wang Genhou, Zhang Linkui, Liang Wei, Zhang Zhi, Dong Suiliang, Huang Yong, 2018. Timing of E-W Extension Deformation in North Himalaya: Evidences from Ar-Ar Age in the Cuonadong Dome, South Tibet. Earth Science, 43(8): 2638-2650. doi: 10.3799/dqkx.2018.530

Citation:

Fu Jiangang, Li Guangming, Wang Genhou, Zhang Linkui, Liang Wei, Zhang Zhi, Dong Suiliang, Huang Yong, 2018. Timing of E-W Extension Deformation in North Himalaya: Evidences from Ar-Ar Age in the Cuonadong Dome, South Tibet. Earth Science, 43(8): 2638-2650. doi: 10.3799/dqkx.2018.530

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Timing of E-W Extension Deformation in North Himalaya: Evidences from Ar-Ar Age in the Cuonadong Dome, South Tibet

doi: 10.3799/dqkx.2018.530

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2018-02-28
Publish Date: 2018-08-15

Abstract

Abstract

The Tethys Himalaya is characterized by the S-N trending and E-W trending structures, and the North Himalaya gneiss domes (NHGD).The Cuonadong dome, located at the eastern part of the North Himalaya, is a recently newly identified dome.The Cuonadong dome is divided into three units from outer to inner:the upper unit (the cover rocks), middle unit (the detachment layer) and lower unit (the core).The middle unit mainly consists of a series of strong deformation schist, pegmatite, granite, marble, and skarn.The main schist types include garnet mica schist, garnet staurolite schist, kyanite garnet staurolite schist, sillimanite kyanite garnet schist, and mica quartz schist.This unit is characterized by a ductile shear zone including the sheath fold, augen structure, rotating porphyroclast, S-C structure, and pressure shadow structure.The Cuonadong dome preserves evidences for four major deformational events:N-S thrust (D₁), early approximately S-N extensional deformation (D₂), approximately E-W extensional deformation (D₃), and collapse structural deformation (D₄).Ar-Ar dating of muscovite from the mylonitic schist in the Cuonadong dome yielded Ar-Ar plateau age of 14.0±0.2 Ma and inverse isochron age of 13.7±0.5 Ma, meanwhile the presence of subgrain rotation recrystallization (SGR) in quartz shows that the schist was deformed under high deformation temperature (450~550℃), which is clearly higher than the closure temperature of muscovite.Therefore, we suggest that the Ar-Ar plateau age of 14.0±0.2 Ma represents the age of the E-W extensional deformation in the Cuonadong dome, also the age of the S-N trending Sangri-Cuona rift.Combined with the structural deformation and thermochronology, we suggest that the formation of the Cuonadong dome resulted from both the earlier S-N and later E-W extensional deformations, especially the S-N extensional deformation, i.e.the STDS.
- Ar-Ar age,
- extension deformation,
- Cuonadong dome,
- North Himalaya,
- geochemistry,
- geochronology

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References(52)

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