Zircon U-Pb geochronology of the Cenozoic granitic mylonite along the Ailaoshan-Red river shear zone: New constraints on the timing of the sinistral shearing

Xiaofei Guo; Yuejun Wang; Huichuan Liu; Jianwei Zi

doi:10.1007/s12583-016-0678-2

Volume 27 Issue 3

Jun 2016

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Journal of Earth Science > 2016 > 27(3): 435-443.

Xiaofei Guo, Yuejun Wang, Huichuan Liu, Jianwei Zi. Zircon U-Pb geochronology of the Cenozoic granitic mylonite along the Ailaoshan-Red river shear zone: New constraints on the timing of the sinistral shearing. Journal of Earth Science, 2016, 27(3): 435-443. doi: 10.1007/s12583-016-0678-2

Citation:

Xiaofei Guo, Yuejun Wang, Huichuan Liu, Jianwei Zi. Zircon U-Pb geochronology of the Cenozoic granitic mylonite along the Ailaoshan-Red river shear zone: New constraints on the timing of the sinistral shearing. Journal of Earth Science, 2016, 27(3): 435-443. doi: 10.1007/s12583-016-0678-2

Citation:

Xiaofei Guo, Yuejun Wang, Huichuan Liu, Jianwei Zi. Zircon U-Pb geochronology of the Cenozoic granitic mylonite along the Ailaoshan-Red river shear zone: New constraints on the timing of the sinistral shearing. Journal of Earth Science, 2016, 27(3): 435-443. doi: 10.1007/s12583-016-0678-2

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Zircon U-Pb geochronology of the Cenozoic granitic mylonite along the Ailaoshan-Red river shear zone: New constraints on the timing of the sinistral shearing

doi: 10.1007/s12583-016-0678-2

Xiaofei Guo^{1, 2},
Yuejun Wang^{3, 4
,
,},
Huichuan Liu³,
Jianwei Zi⁵

1.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou 510275, China
4.
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China
5.
School of Earth and Environment, University of Western Australia, Crawley 510275, Western Australia

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Corresponding author: Yuejun Wang, wangyuejun@mail.sysu.edu.cn
Received Date: 12 Sep 2015
Accepted Date: 15 Jan 2016
Publish Date: 10 Jun 2016

Abstract

Abstract

The Ailaoshan-Red River (ASRR) shear zone in SW China represents an important discontinuity believed to have accommodated eastward extrusion of the Tibetan Plateau in response to the collision of the Indian and Eurasian plates. The onset timing and duration of the ASRR sinistral strike-slip shearing have been hotly disputed. In this paper we present new zircon LA-ICP-MS U-Pb geochronological data from six syntectonic granitic mylonite and leucosomes samples from the ASRR shear zone. Our data reveal a metamorphic age of ~40 Ma, most likely suggesting the maximum age of the shearing initiation. Rocks showing syn-kinematic signatures yield crystallization ages of 38–22 Ma, with inherited components ranging from 716 to 108 Ma. These results, together with existing geological and geochronological data, indicate that the sinistral shearing along the ASRR zone probably began at 40 Ma, mainly activated at 29–22 Ma and lasted at least to ~22 Ma. Our data suggest a continuous extrusion between the Indochina and South China blocks during ~35–17 Ma. The ASRR sinistral shearing has accommodated large scale eastward displacement of the southeastern Tibetan syntaxis, and is likely responsible for the opening of the South China Sea.
- Ailaoshan-Red River,
- zircon U-Pb dating,
- mylonite and migmatite,
- sinistral shearing,
- eastward extrusion

Electronic Supplementary Material: Supplementary material (Table S1) is available in the online version of this article at http://dx.doi.org/10.1007/s12583-016-0678-2.

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References(57)

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Zircon U-Pb geochronology of the Cenozoic granitic mylonite along the Ailaoshan-Red river shear zone: New constraints on the timing of the sinistral shearing

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Zircon U-Pb geochronology of the Cenozoic granitic mylonite along the Ailaoshan-Red river shear zone: New constraints on the timing of the sinistral shearing

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