Re-Os Isotopic Dating of Arsenopyrite from Auriferous Quartz Vein-type Gold Deposits in the Southwestern Margin of Jiangnan Orogen

Shang-yi GU; Ding-quan DU; Yong FU; Shi-jun SUN; Chao LI

doi:10.15898/j.cnki.11-2131/td.2016.05.013

2016 Vol. 35, No. 5

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Shang-yi GU, Ding-quan DU, Yong FU, Shi-jun SUN, Chao LI. Re-Os Isotopic Dating of Arsenopyrite from Auriferous Quartz Vein-type Gold Deposits in the Southwestern Margin of Jiangnan Orogen[J]. Rock and Mineral Analysis, 2016, 35(5): 542-549. doi: 10.15898/j.cnki.11-2131/td.2016.05.013

Citation:

Shang-yi GU, Ding-quan DU, Yong FU, Shi-jun SUN, Chao LI. Re-Os Isotopic Dating of Arsenopyrite from Auriferous Quartz Vein-type Gold Deposits in the Southwestern Margin of Jiangnan Orogen[J]. Rock and Mineral Analysis, 2016, 35(5): 542-549. doi: 10.15898/j.cnki.11-2131/td.2016.05.013

Re-Os Isotopic Dating of Arsenopyrite from Auriferous Quartz Vein-type Gold Deposits in the Southwestern Margin of Jiangnan Orogen

1.
College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
2.
Guizhou Institute of Technology, Guiyang 550003, China
3.
National Research Center for Geoanalysis, Beijing 100037, China

Received Date: 29 July 2016

Revised Date: 30 August 2016

Accepted Date: 28 September 2016

Abstract

Abstract

Quartz vein-type gold deposits of Southeastern Guizhou Province in the southwestern margin of Jiangnan Orogen, which are typical orogenic gold deposits, are hosted in Neoproterozoic Banxi Group sub-greenschist facies metamorphic rocks. However, similar to other gold deposits in Jiangnan Orogen, mineralization ages of these deposits is a controversial issue and its relationship with Indosinian and Caledonian intra-continental orogenies remains unresolved, which limits the further study of ore-forming mechanisms. In this study, highly precise Re-Os isotopic analyses for arsenopyrites from bedding-concordant veins in Pingqiu and Bake Deposits were performed, and the isochron Re-Os ages of 235±3.4 Ma and 410±52 Ma, respectively were obtained. Low Re in arsenopyrite samples is responsible for the large uncertainty of Bake Re-Os isochron age. Nonetheless, the lack of common Os in one arsenopyrite sample from the Bake permit calculation of a single mineral model age, which is consistent with those determined using the isochron method. The Re-Os ages of arsenopyrite indicate that there were two distinct periods of gold deposition in Jiangnan Orogen coinciding with Caledonian and Indo-Sinian intra-continental orogenies.
- Jiangnan Orogen /
- gold deposits /
- arsenopyrite /
- Re-Os isotope /
- Caledonian Epoch /
- Indo-Sinian Epoch

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References

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