The strong activities of the Namula fault zone in the eastern Himalayan syntaxis since Pliocene, constraints from thermochronological data

TU Jiyao; JI Jianqing; ZHONG Dalai; SUN Dongxia; ZHOU Jing

doi:10.12090/j.issn.1006-6616.2021.27.04.056

Volume 27 Issue 4

Aug. 2021

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TU Jiyao, JI Jianqing, ZHONG Dalai, et al., 2021. The strong activities of the Namula fault zone in the eastern Himalayan syntaxis since Pliocene, constraints from thermochronological data. Journal of Geomechanics, 27 (4): 679-690. DOI: 10.12090/j.issn.1006-6616.2021.27.04.056

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The strong activities of the Namula fault zone in the eastern Himalayan syntaxis since Pliocene, constraints from thermochronological data

doi: 10.12090/j.issn.1006-6616.2021.27.04.056

1.
Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
3.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Funds:

the National Natural Science Foundation of China 41603055

the Special Fund of the Institute of Geophysics, China Earthquake Administration DQJB20X10

More Information

Received: 2021-05-11
Revised: 2021-06-25
Published: 2021-08-28

Abstract

Abstract

To reveal the strong activities of the Namula fault zone in the eastern Himalayan syntaxis since Pliocene, this paper reports biotite ⁴⁰Ar/³⁹Ar and apatite fission track ages of 3 rock samples from the Namula fault zone, and quantitatively interpret these ages and the published ages from the adjacent areas, using a modeling code "Pecube". Biotite ⁴⁰Ar/³⁹Ar ages range from 4.44±0.71 Ma to 3.45±0.24 Ma, and apatite fission track ages range from 3.7±0.4 Ma to 1.8±0.2 Ma. The ages and simulation results show that, prior to ~3 Ma the highest exhumation rate had been located in the south of the Namula fault zone and was about 2.5 km/Ma, and the Namula fault zone had a motion feature of normal fault; Since ~3 Ma the highest exhumation rate have been located in the north of the Namula fault zone and was about 1.3 km/Ma, and the Namula fault zone had a motion feature of thrust fault. The evolution of the Namula fault zone's motion, probably have resulted from the south to north migration of the fast crust exhumation area in the eastern Himalayan syntaxis since ~8 Ma.
- the Namula fault zone,
- the eastern Himalayan syntaxis,
- biotite ⁴⁰Ar/³⁹Ar,
- apatite fission track

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The strong activities of the Namula fault zone in the eastern Himalayan syntaxis since Pliocene, constraints from thermochronological data

doi: 10.12090/j.issn.1006-6616.2021.27.04.056

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The strong activities of the Namula fault zone in the eastern Himalayan syntaxis since Pliocene, constraints from thermochronological data

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