| 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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| 引用本文：冉凤琴,柳维君,张博,彭勃,王国富,邓辉,杨洪伟,田欢欢,杨彦宏,赵媛,代涌坤,王思睿,韩警锐,孙崇波,高学震,刘严松,鲁军.2026.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[J].地球学报,47(2):235-248. |
| DOI：10.3975/cagsb.2026.020301 |
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| 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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| 中文摘要:夏囊沟矿床是义敦弧北段新发现的大型富金银铅锌铜矿床。本文基于系统的野外地质调查、钻孔岩心编录、岩相学观察及短波红外光谱分析, 对该矿床的地质特征、控矿因素与矿床成因进行了研究。结果表明, 矿体主要呈陡立板柱状赋存于上三叠统勉戈组凝灰岩中, 受北西向断裂及隐爆角砾岩筒联合控制。矿石具有细脉-网脉-浸染状、角砾状、块状构造, 矿石矿物组合为闪锌矿+方铅矿+黄铜矿±锑黝铜矿±砷黝铜矿。围岩蚀变具明显分带, 垂向上呈现浅部Pb-Zn→中部Cu-Pb-Zn→深部Cu(Au、Ag)的矿化元素分带序列; 蚀变矿物组合为石英-碳酸盐-白云母-伊利石, 矿化带的空间蚀变分带清晰, 从内向外为硅化-绢英岩化核、绢云母化-黏土化带至外带的青磐岩化。研究认为, 夏囊沟矿床属中硫化型(IS型)浅成低温热液矿床, 是义敦弧北段首次发现的矿床类型, 该发现突破了本区前人以VMS型矿床为主的认识, 显示晚三叠世火山岩系中具有寻找“斑岩-浅成低温热液”成矿系统的潜力, 为区域找矿提供了新方向。 |
| 中文关键词:夏囊沟 富金银铅锌铜矿 中硫化型 浅成低温热液矿床 隐爆角砾岩 义敦弧 |
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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 |
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| Abstract: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. |
| keywords:Xia’nanggou Au-Ag-Pb-Zn-Cu deposit intermediate-sulfidation epithermal deposit phreatomagmatic breccia Yidun Arc |
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