罗 恒.鄂东南张海金矿床地质地球化学特征及找矿模型[J].地质与勘探,2021,57(5):994-1007 |
鄂东南张海金矿床地质地球化学特征及找矿模型 |
Geological, geochemical characteristics and prospecting model for the Zhanghai gold deposit in southeastern Hubei Province |
投稿时间:2021-04-07 修订日期:2021-08-15 |
DOI:10.12134/j.dzykt.2021.05.005 |
中文关键词: 地质特征 土壤地球化学 找矿模型 张海金矿床 鄂东南 |
英文关键词: geological characteristics, soil geochemistry, prospecting model, Zhanghai gold deposit, southeastern Hubei |
基金项目:湖北省地质勘查基金项目(编号:[2019]19号)资助 |
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中文摘要: |
张海金矿床位于长江中下游鄂东南矿集区殷祖岩体东南缘,是赋存于沉积岩中的浸染型金矿床。为明确该矿床成矿规律和找矿方向,在区内开展了典型矿床研究和土壤地球化学测量工作。研究表明,矿区赋矿地层为志留系新滩组含炭质粉砂岩及页岩;矿体受NEE向背斜和断裂构造联合控制;成矿与闪长玢岩关系密切,由近及远发育Cu-(Fe)→Au-Sb→Pb-Ag-Au成矿元素组合分带和矽卡岩型、微细浸染型、热液交代型等矿化类型分带。土壤地球化学异常以Au、As、Sb、Ag为主,各元素含量变化趋势较一致且峰值明显,能有效指示矿化带(体)的存在。据此建立了张海金矿床地质-地球化学找矿模型,经验证找矿效果良好,能较好地指导鄂东南美人尖-张海-凤头成矿带同类型金矿床的勘查和评价工作。 |
英文摘要: |
The Zhanghai gold deposit is located in the southeast margin of Yinzu pluton in southeastern Hubei ore concentration area in the middle-lower Yangtze River metallogenic belt, and belongs to a sediment-hosted disseminated gold deposit. In order to determine the ore-forming rules and prospecting direction in this area, this work conducted typical deposit research and soil geochemical survey in this survey area. Results show that the main ore-bearing stratum is the Lower Silurian Xintan Group carbonaceous siltstone and shale. Ore bodies show a joint control by the NEE-trending anticline and faults. The ineralization is closely related to diorite porphyrite, with Cu- (Fe)→Au-Sb→Pb-Ag- Au metallogenic element assemblage zoning and skarn type, disseminated type, and hydrothermal metasomatic type ore mineral zoning from near to far. The soil geochemical anomalies are dominated by Au, As, Sb and Ag elements. The change trend of each element is consistent and the peak value is obvious, which can effectively indicate the existence of mineralized zone and ore bodies. Combined with geological and soil geochemical characteristics of the Zhanghai gold deposit, a comprehensive prospecting model was proposed herein to prospect new ore-bodies, which was well verified by the prospecting effect. The comprehensive prospecting model can better guide the exploration and evaluation of the Zhanghai gold deposit and the same type of gold deposits in the Meirenjian-Zhanghai-Fengtou metallogenic belt in southeast Hubei. |
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