<sup>40</sup>Ar/<sup>39</sup>Ar laser dating of the Zongwulong ductile shear zone in northeastern Tibetan Plateau: Constraints on the time of Indosinian orogeny

GAO Wanli; WANG Zongxiu; LI Leilei; QIAN Tao; CUI Mingming

doi:10.12029/gc20210111

GEOLOGY IN CHINA > 2021 > 48(1): 149-160. > DOI: 10.12029/gc20210111

GAO Wanli, WANG Zongxiu, LI Leilei, QIAN Tao, CUI Mingming. ⁴⁰Ar/³⁹Ar laser dating of the Zongwulong ductile shear zone in northeastern Tibetan Plateau: Constraints on the time of Indosinian orogeny[J]. GEOLOGY IN CHINA, 2021, 48(1): 149-160. DOI: 10.12029/gc20210111

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⁴⁰Ar/³⁹Ar laser dating of the Zongwulong ductile shear zone in northeastern Tibetan Plateau: Constraints on the time of Indosinian orogeny

Key Lab of Shale Oil and Gas Geological Survey, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Funds:

the project of China Geology Survey DD20189614

the project of China Geology Survey 1212011121068

the National Natural Science Foundation of China 41702204

More Information

Author Bio:
GAO Wanli, male, born in 1985, assistant researcher, mainly engaged in the research of geotectonics and petrogenesis; gwanli851202@163.com
Received Date: May 20, 2018
Revised Date: November 29, 2019
Available Online: September 25, 2023

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Abstract

Abstract

The Zongwulong tectonic belt (ZTB) is located between the northern Qaidam tectonic belt and the south Qilian orogenic belt and contains Late Paleozoic and Early-Middle Triassic strata. Structural features and geochronology of the Zongwulong ductile shear zone have key implications for the tectonic property of the ZTB. This study integrated field structure, microscopic structure and ⁴⁰Ar/³⁹Ar laser probe analysis. The shear zone strikes ~NEE-SWW and dips at a high angle, with a NWW-SEE trending and W-E stretching lineation, indicating the shear zone as a thrust-slip shear ductile shear. The asymmetric folds, rotating porphyroclast, structural lens and crenulation cleavage can be seen in the field. Mica fish, S-C fabrics, σ type quartz porphy roblasts and quartz wire drawing structure can also be observed under the microscope, indicating that the strike-slip related ductile deformation and mylonitization occurred under low-grade greenschist facies conditions at temperatures of 300℃ -400℃. The highly deformed mylonite schist yielded ⁴⁰Ar/³⁹Ar ages (245.8±1.7)Ma and (238.5±2.6)Ma for muscovite and biotite, respectively, indicating that the shear deformation occurred during the Early-Mid Triassic. Combined with a comprehensive analysis of regional geology and petrology, the authors hold that the age of ductile shear deformation represents the time of Indosinian orogeny in the ZTB. The orogenic activity was probably related to the oblique collision between the South Qilian block and the Oulongbuluke block after the closure of the ocean basin.
- Tibetan Plateau,
- the Zongwulong tectonic belt,
- Triassic,
- ductile shear zone,
- ⁴⁰Ar/³⁹Ar isotope chronology,
- geological survey engineering

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References (53)

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⁴⁰Ar/³⁹Ar laser dating of the Zongwulong ductile shear zone in northeastern Tibetan Plateau: Constraints on the time of Indosinian orogeny