文献类型：期刊文献

英文题名：Vertical evolution of Ag-Pb-Zn-(Cu)-Mo in porphyry system: A case study from the Laochang deposit, SW China

作者：Sun, Guotao Zhou, Jia-Xi Long, Han-Sheng Zhou, Lingli Luo, Kai

第一作者：Sun, Guotao

通信作者：Zhou, JX[1]

机构：[1]Yunnan Univ, Sch Earth Sci, Kunming 650500, Yunnan, Peoples R China;[2]Key Lab Crit Minerals Metallogeny Univ Yunnan Pro, Kunming 650500, Yunnan, Peoples R China;[3]Yunnan Univ, Sch Ecol & Environm Sci, Kunming 650500, Yunnan, Peoples R China;[4]Minist Nat Resources, Key Lab Sanjiang Metallogeny & Resources Explorat, Kunming 650500, Yunnan, Peoples R China;[5]Sch Resources & Environm Engn, Guizhou Inst Technol, Guiyang 550003, Peoples R China;[6]Univ Coll Dublin, iCRAG, Dublin 4, Ireland;[7]Univ Coll Dublin, Sch Earth Sci, Dublin 4, Ireland

第一机构：Yunnan Univ, Sch Earth Sci, Kunming 650500, Yunnan, Peoples R China

通信机构：corresponding author), Yunnan Univ, Sch Earth Sci, Kunming 650500, Yunnan, Peoples R China.

年份：2021

卷号：139

外文期刊名：ORE GEOLOGY REVIEWS

收录：;EI(收录号：20213610868274);Scopus(收录号：2-s2.0-85114177493);WOS:【SCI-EXPANDED(收录号:WOS:000706418200002)】；

基金：This study was financially supported by the National Natural Science Foundation of China (41872095, 42172082, 41102053 and 41102055), the National Key R&D Project of China (2017YFC0602502), and the Research Startup Project (YJRC4201804), and the Cultivation Project (2018YDJQ009) of Yunnan University. We would like to thank the researchers in the laboratories of LA-ICPMS, and stable isotopes at the Institute of Geochemistry, Chinese Academy of Sciences for their analytical works. We also thank Profs. Jingwen Mao and David Huston for their constructive comments and Associate Editor Dr. Alain CHAUVET for handling our manuscript.

语种：英文

外文关键词：Geochronology; C-O and S-Zn isotopes; Ag-Pb-Zn-(Cu)-Mo mineralization; Porphyry system; Sanjiang Tethys

摘要：Distal massive sulfide Ag-Pb-Zn mineralization is commonly associated with proximal porphyry Mo-(Cu) systems, but the vertical evolution of Ag-Pb-Zn-(Cu)-Mo distribution within porphyry systems remains poorly understood and documented. The Laochang deposit located in the southeastern Sanjiang metallogenic belt, SW China contains both the massive sulfide Ag-Pb-Zn-(Cu) and porphyry-skarn Mo-(Cu) mineralization (1737 t Ag@222 g/t, 0.51 Mt Pb@5.1 wt%, 0.34 Mt Zn@3.1 wt%, 117, 800 t Mo@0.15 wt%, and 0.1 Mt Cu@0.2 wt%), thus representing an excellent case study. The Laochang deposit is mainly hosted in early Carboniferous volcanic rocks, late Carboniferous to early Permian carbonate rocks, and links with Eocene granite porphyry. Here, we report Rb-Sr age of sphalerite and pyrite from the massive sulfide Ag-Pb-Zn-(Cu) ores, zircon U-Pb age for the granite porphyry, C-O isotopes of hydrothermal calcite, and S-Zn isotopes of sulfide minerals to reveal the vertical distribution of Ag-Pb-Zn-(Cu)-Mo mineralization in porphyry system. The sulfides Rb-Sr age (45.1 +/- 3.6 Ma) is similar to the zircon U-Pb age (44.6 +/- 0.2 Ma), indicating the Ag-Pb-Zn-(Cu) mineralization has a genetic link with the granite porphyry and formed in the same system as the porphyry-skarn Mo-(Cu) mineralization. Furthermore, the C-O isotopic compositions of the hydrothermal calcite suggest a diminishing contribution of the host rocks and an increasing input of the meteoric water in the hydrothermal fluids from deep to shallow. The SZn isotopic compositions of the sulfide minerals indicate a magmatic source of the ore-forming elements. The delta 34S values decrease, and the delta 66Zn values increase with elevated levels of sampling depth, implying a Rayleigh fractionation process. This means fluids and late-stage sulfides evolved toward isotopically lighter sulfur and heavier zinc isotopes. Hence, we propose that the Laochang deposit is a porphyry system comprising distal AgPb-Zn-(Cu) and proximal Mo-(Cu) mineralization. In addition, the sulfur and zinc isotopic systematics observed in this study provides a new insight into the mineralization processes of the porphyry-distal systems.