Muscovite 40Ar/39Ar dating of the BaiganhuW-Sn orefield, Qimantag, East Kunlun Mountains, and its geological implications

ZHENG Zhen; CHEN Yan-jing; DENG Xiao-hua; YUE Su-wei; CHEN Hong-jin

doi:10.12029/gc20160419

2016 Vol. 43, No. 4

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Article navigation > Geology in China > 2016 > (4): 1341-1352

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ZHENG Zhen, CHEN Yan-jing, DENG Xiao-hua, YUE Su-wei, CHEN Hong-jin. Muscovite 40Ar/39Ar dating of the BaiganhuW-Sn orefield, Qimantag, East Kunlun Mountains, and its geological implications[J]. Geology in China, 2016, (4): 1341-1352. doi: 10.12029/gc20160419

Citation:

ZHENG Zhen, CHEN Yan-jing, DENG Xiao-hua, YUE Su-wei, CHEN Hong-jin. Muscovite 40Ar/39Ar dating of the BaiganhuW-Sn orefield, Qimantag, East Kunlun Mountains, and its geological implications[J]. Geology in China, 2016, (4): 1341-1352. doi: 10.12029/gc20160419

Muscovite 40Ar/39Ar dating of the BaiganhuW-Sn orefield, Qimantag, East Kunlun Mountains, and its geological implications

1.
Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China
2.
Beijing Institute of Geology for Mineral Resources, Beijing 100012, China
3.
Guangzhou College, South China University of Technology, Guangzhou 510802, Guangdong China

Received Date: 14 March 2016

Revised Date: 20 June 2016

Publish Date: 24 August 2016

Abstract

Abstract

The newly discovered Baiganhu W-Sn ore district in Qimantag of East Kunlun orogenic belt provides a key window to insight into the W-Sn mineralization in Northwest China. In this paper, the authors present results from the 40Ar/39Ar dating of two muscovite samples collected from the ore-bearing quartz veins in the Baiganhu W-Sn ore district, which yielded two 40Ar/39Ar plateau ages of 422.7 ±4.5 Ma and 421.8 ±2.7 Ma, respectively. These two samples also yielded consistent (within errors) isochronal and inverse isochronal ages of 424 ±15 Ma and 418 ±24 Ma, respectively, suggesting that the analytical results are reliable. The new plateau ages show that the mineralization occurred in the Late Silurian, associated with the tectonic-thermal events induced by the closure of Proto-Tethys. The post-subduction continental collision caused the formation of granitic magmas sourced from remelting of the metalliferous metamorphosed Proterozoic sediments. The W-Sn mineralization resulted by the hydrothermal fluids exsolved from the granitic magmas during their upward emplacement.
- ⁴⁰Ar/³⁹Ar dating /
- muscovite /
- BaiganhuW-Sn ore district /
- Qimantag /
- East Kunlun orogenic belt