| Citation: | GUAN Jiyun，ZHANG Qidao，CAO Yi，et al. Genesis of the Naneng gold deposit in southeastern Yunnan: Evidence from in-situ trace elements and isotopes of sulfides[J]. Bulletin of Geological Science and Technology，2025，${article_volume}（0）：1-15 doi: 10.19509/j.cnki.dzkq.tb20240520
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The Naneng gold deposit is an important medium-sized Carlin type gold deposit in southeastern Yunnan, and studying its genesis is of great significance for searching for such gold deposits in southeastern Yunnan.
Two generations of pyrite (PyI and PyII) were found to develop in the Naneng gold deposit during detailed field survey and indoor observation, and trace elements and sulfur isotopes of gold-bearing minerals are analyzed by LA-ICP-MS to constrain the source of ore-forming materials and ore genesis.
LA-ICP-MS analyses show that PyI contains a small amount of Au (mean 6.37×10−6), which is relatively enriched in elements such as Co, Ni, Se, W; The distribution characteristics of trace elements in PyII and PyI are similar, but the content of Au (mean 68.02×10−6) is relatively high, and As, Sb, Cu elements are enriched in PyII; The average Au content of arsenopyrite is 36.02×10−6, and arsenopyrite is mainly enriched in elements such as As、Ni、Sb、Se、Au, while Zn, Ag, Hg and Tl elements are low. In addition, gold-bearing minerals in the Naneng gold deposit have consistent in situ
It is preliminarily concluded that PyI was formed in a relatively stable environment by medium to low temperature hydrothermal fluid from the same source rich in trace elements such as Au、As、Sb, and a small amount of Au precipitated simultaneously with PyI in the form of solid solution (Au+). In the PyII stage, the intense tectonic activity in the area caused ore-forming fluid to upswell, and after sulfidation reaction with surrounding rock strata, the concentration of H2S in the fluid decreased, Au-HS complex became unstable, and Au supersaturated precipitation was enriched in PyII in the form of nanoscale inclusions (Au0).
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