ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    西秦岭宕昌–西和锑矿集区勘查新进展及成矿预测研究

    New Discoveries and Prospecting Prediction of the Tanchang-Xihe Antimony Ore Cluster, West Qinling

    • 摘要: 宕昌–西和地区是西秦岭地区乃至西北地区最为重要的锑(金)矿集区,已发现了西和县崖湾、宕昌县泰山、宕昌县瓦石沟等大型锑矿床和西和县大桥超大型金矿床。区内近年来锑矿勘查取得多项重要进展,对其研究将有助于推动成矿带整体找矿突破。新发现的宕昌县白杨坝中型锑矿床,具有矿带走向延伸长度大、尖灭再现和平行断裂构造均赋矿的特征;新发现的宕昌庙沟小型锑金矿床,是矿集区内首次发现锑金共伴生矿床,为矿集区找矿提供新思路,需加强金矿找矿部署;宕昌县瓦石沟锑矿矿体受控于断裂和褶皱形成的构造虚脱空间规模,走向延伸稳定,局部特大空腔可富集形成巨大矿囊;宕昌县草山沟锑矿深部勘查成效显著,矿体垂向延伸方向具有深度大、尖灭再现的特征。理论研究认为降温是辉锑矿沉淀主要机制,pH值向中性变化将进一步促进辉锑矿沉淀,结合矿集区成矿特征总结,锑矿受多级次构造和地层岩性双重控制,区域上合作–宕昌–两当深大断裂控制了主要锑矿集区分布,次级断裂和褶皱构造是锑矿主要赋矿位置,泥质岩石常常形成锑矿隔挡层,钙质砂岩和灰岩是有利储矿层位。建立综合找矿模型,构造背景、控矿构造、赋矿地层、岩性建造、蚀变特征和化探异常是主要找矿要素。使用地球化学多元信息融合技术方法对1∶5万水系沉积物测量数据进行处理分析,开展找矿预测,新圈定找矿靶区9处。研究综合显示,矿集区锑(金)矿找矿潜力巨大,需要根据锑矿成矿规律,加强锑金矿勘查部署,力争矿集区进一步取得全面找矿突破。

       

      Abstract: The Tanchang-Xihe area represents the most important antimony (gold) ore district in the West Qinling region and even the wider northwestern China. It hosts several large antimony deposits(Yawan, Taishan and Washigou), as well as the super-large Daqiao gold deposit. Recent exploration has yielded significant advances. The newly discovered Baiyangba antimony deposit (medium-sized) is characterized by a large strike extent of ore belts, with ore bodies occurring in both pinch-out-reappearance structures and parallel fault zones. The Miaogou antimony-gold deposit (small-sized) is the first Sb-Au paragenetic deposit identified in the district, offering new exploration directions and highlighting the need to strengthen gold exploration efforts. At the Washigou antimony deposit, the ore bodies controlled by structural dilation spaces formed by faults and folds, exhibiting stable strike extensions and locally developed large cavities that host giant ore pockets. At the Caoshangou antimony deposit, significant deep exploration results reveal considerable vertical extension and pinch-out–reappearance characteristics of the ore bodies. Theoretical studies indicate that cooling is the primary mechanism for stibnite precipitation, and a shift toward neutral pH further promotes this process. Regional metallogeny is jointly controlled by multi-order structures and lithological units. The Hezuo-Tanchang-Liangdang deep fault governs the distribution of the ore district, whereas secondary faults and folds serve as the main ore-hosting structures. Argillaceous rocks act as impermeable barriers, while calcareous sandstones and limestones constitute favorable host units. A comprehensive exploration model has been established incorporating tectonic setting, ore-controlling structures, host strata, lithological associations, alteration characteristics, and geochemical anomalies. Using multi-information fusion of 1∶50000 stream sediment geochemical data, nine new exploration targets have been delineated.Overall, the ore district exhibits significant potential for Sb-Au mineralization. Further exploration efforts should be strengthened based on the metallogenic characteristics to achieve a full breakthrough.

       

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