<sup>40</sup>Ar/<sup>39</sup>Ar Geochronology of the Yongning Ductile Shear Zone in the Southeastern Margin of Yunkai Terrain, Yangchun, Guangdong

LIChu-An; ZHUANGWen-Ming; LINZhen-Wen; ZHOUDai

doi:10.3969/j.issn.2097-0013.2022.03.015

2022 Vol. 38, No. 3

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LIChu-An, ZHUANGWen-Ming, LINZhen-Wen, ZHOUDai. 2022. 40Ar/39Ar Geochronology of the Yongning Ductile Shear Zone in the Southeastern Margin of Yunkai Terrain, Yangchun, Guangdong. South China Geology, 38(3): 542-549. doi: 10.3969/j.issn.2097-0013.2022.03.015

Citation:

LIChu-An, ZHUANGWen-Ming, LINZhen-Wen, ZHOUDai. 2022. ⁴⁰Ar/³⁹Ar Geochronology of the Yongning Ductile Shear Zone in the Southeastern Margin of Yunkai Terrain, Yangchun, Guangdong. South China Geology, 38(3): 542-549. doi: 10.3969/j.issn.2097-0013.2022.03.015

⁴⁰Ar/³⁹Ar Geochronology of the Yongning Ductile Shear Zone in the Southeastern Margin of Yunkai Terrain, Yangchun, Guangdong

1. Guangdong Marine Geological Survey, Guangzhou 510080, Guangdong, China
2. Wuhan Center of China Geological Survey (Central South China Innovation Center for Geosciences), Wuhan 430205, Hubei, China

Received Date: 10 August 2022

Revised Date: 01 September 2022

Abstract

Abstract

The Yongning ductile shear zone within the Wuchuan-Sihui fault zone is the southeastern boundary of the Yunkai Massif, and the determination of the age of the formation of this shear zone is of great significance to the study of regional geological evolution and the genesis of ductile shear zone type gold deposits. Tectonic kinematic characterization indicates that the Yongning ductile shear zone is characterised by left-slip thrusting shear. In this paper, we carried out the ⁴⁰Ar/³⁹Ar dating on single mica grains from the Yongning ductile shear zone, and obtained the plateau ages of 227.38 ~ 232.77 Ma and the isochron ages of 229.94 ~ 232.47 Ma, indicating that the Yongning ductile shear zone was formed in the early Late Triassic and was a product of the first stage of Indosinian event. The multi-stage active NE shear zone controlled the distribution of Ag-Au deposits directly or indirectly.
- Yunkai terrain /
- Wuchuan-Sihui faults /
- Yongning shear zone /
- sinistral shearing /
- muscovite 40Ar-39Ar geochronological dating /
- Indosinian movement

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References

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