Citation: | Nan Xu, Cai-lai Wu, Sheng-rong Li, Bo-qiang Xue, Xiang He, Yan-long Yu, Jun-zhuang Liu, 2020. LA-ICP-MS in situ analyses of the pyrites in Dongyang gold deposit, Southeast China: Implications to the gold mineralization, China Geology, 3, 230-246. doi: 10.31035/cg2018123 |
The Dongyang gold deposit is a newly discovered epithermal deposit in Fujian Province, Southeast China, along the Circum-Pacific metallogenic belt. Herewith, the authors present mineralogical, scanning electron microscope, and laser ablation inductively coupled clasma mass spectrometry analysis to reveal the relations between Au and Te, As, S, Fe, etc., and discuss the gold precipitation process. The pyrites in this deposit are Fe-deficient, and are enriched in Te and As. The authors infer that As was mainly in form of As-complexes, and Te-Au-Ag inclusions/solid solution also exsits in the Py I. Along with the depletion of Te and As, they were less active chemically in the Py II, and Au may be incorporated into As-rich and Fe-deficient surface sites by chemisorption onto As-rich growth surfaces. Because of the incorporation of new fluid, Te and As became the most active chemically in the Py III, which was the main elements precipitation stage, and As dominantly substituted for S in the lattice of pyrite, due to the more reducing condition. The authors propose Au was in form of invisible gold, and the incorporation of gold can be considered as post-pyrite event, while the Au-bearing minerals were result of post incorporation of gold in arsenian pyrite.
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a–Study area location in China; b–regional tectonics, metallogenic belt and Yanshanian volcanic rocks of Southeast China (after Xu N et al., 2020); c–regional geology, tectonics and distribution of ore deposits in the Dongyang gold deposit of Fujian Province, China; d–geology of Dongyang gold deposit; e–207 prospecting line and drill core location.
Backscatter image showing the metal minerals in Dongyang Au deposit.
Representative photomicrographs in reflected light showing the metal inclusions in pyrite of Dongyang Au deposit. The thin sections are from ores.
Representative photomicrographs in reflected light showing the crystal form of pyrite in Dongyang Au deposit. The thin sections are from ore of sub-rhyolite porphyry.
Plot of Co vs. Ni and As vs. (Fe+S) showing the genesis of pyrite in Dongyang gold deposit (after Bajwah ZU et al., 1987).
Diagram showing the amount and correlation between As vs. Fe, S, Au, and Ag.
Concentrations and correlation coefficients between Te and metal elements in the pyrite of Dongyang gold deposit.
Concentrations of Au vs. As (a) and Te vs. As (b). The dashed line represents the gold solid solution limit (a) (after Reich M et al., 2005) and the Te solid solution limit (b) in arsenian pyrite valid for As concentrations (after Keith M et al., 2017).
a–c–Photomicrograph of the pyrites for Scanning Electron Microscope analysis ; d–surface scanning; e, f–line scanning. Sp-sphalerite, Py-pyrite.