| 义敦弧北段首次发现大型中硫化型浅成低温热液富金银铅锌铜矿床 |
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| 关键词:Xia’nanggou Au-Ag-Pb-Zn-Cu deposit intermediate-sulfidation epithermal deposit phreatomagmatic breccia Yidun Arc |
| 基金项目:本文由杭州越昌科技有限公司“四川白玉县夏囊沟铅锌矿控矿因素及找矿潜力研究”项目(编号: AH2025-0483)和四川省科技厅“川西可尔因锂矿田矿物地球化学-高光谱勘查建模”项目(编号: 2026NSFSC1144)联合资助。 |
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| The First Discovery of a Large Intermediate-sulfidation Epithermal Au-Ag-Pb-Zn-Cu Deposit in the Northern Segment of the Yidun Arc |
| The Xia’nanggou deposit is a newly discovered Au-Ag-Pb-Zn-Cu mineralization system in the northern segment of the Yidun Arc (SW China). Based on integrated field mapping, drill core logging, petrographic observations, and shortwave infrared (SWIR) spectral analysis, we documented its geological characteristics, ore control, and genetic type. Orebodies occur as steep, tabular to pipe-like shoots hosted by Upper Triassic Mengge Formation tuffs and are jointly controlled by NW-trending faults and a concealed phreatomagmatic breccia pipe. The ore textures include veinlet-stockwork-disseminated, brecciated, and massive styles. The principal sulfide assemblages are sphalerite, galena, chalcopyrite, tetrahedrite, and tennantite. The alteration is well-zoned, with an inner silicifica-tion-sericitization core grading outward to a sericite-argillic zone and a distal propylitic halo, and the dominant al-teration minerals are quartz-carbonate-muscovite-illite. A vertical metal zonation was observed from Pb-Zn in the shallow levels to Cu-Pb-Zn at intermediate depths and Cu (with elevated Au and Ag) at depth. Collectively, these features indicate an intermediate sulfidation epithermal system. This discovery expands the recognized deposit spectrum of the northern Yidun Arc and suggests a potential for porphyry-epithermal metallogenic systems within Late Triassic volcanic sequences. |
| RAN Fengqin,LIU Weijun,ZHANG Bo,PENG Bo,WANG Guofu,DENG Hui,YANG Hongwei,TIAN Huanhuan,YANG Yanhong,ZHAO Yuan,DAI Yongkun,WANG Sirui,HAN Jingrui,SUN Chongbo,GAO Xuezhen,LIU Yansong,LU Jun.2026.The First Discovery of a Large Intermediate-sulfidation Epithermal Au-Ag-Pb-Zn-Cu Deposit in the Northern Segment of the Yidun Arc[J].Acta Geoscientica Sinica,47(2):235-248. |
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