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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    青海祁漫塔格成矿带冰沟南地区成矿类型及找矿前景

    Mineralization Types and Prospecting Potential of Binggounan Area in Qimantage Metallogenic Belt, Qinghai Procince

    • 摘要: 冰沟南地区位于青海省东昆仑造山带西段祁漫塔格成矿带,成矿地质条件优越,但受自然条件的制约。冰沟南矿床发现较晚,且工作程度较低,找矿类型和找矿前景不明朗。通过分析矿床的地质特征、成矿规律及物化探资料,结合近期铜镍找矿新发现,将冰沟南地区的成矿类型划分为5种类型:矽卡岩型、热液型、斑岩型、岩浆熔离型及沉积变质型。矽卡岩型-热液型-斑岩型铜-铅-锌-钼矿和岩浆熔离型镍-铜-钴矿为最主要的2个成矿系列,前者与晚三叠世花岗岩作用密切相关,后者与后碰撞阶段伸展构造背景下幔源岩浆活动密切相关。利用"协优成矿预测"理论,对冰沟南地区找矿前景进行了分析,认为Ⅲ矿带北部具有寻找热液型铅-铜-钴矿找矿潜力,冰沟南矿区中北部具有寻找岩浆熔离型镍-铜-钴矿的良好前景。

       

      Abstract: Binggounan area is located in Qimantage mineralization belt in the west section of East-Kunlun orogenic belt, Qinghai Province, with very favorable mineralization condition. But the prospecting type and prospecting potential are disclear in this area, because the related depositsare discovered very late and the degree of geological works is low. After analyzing the geological characteristics of the related deposits, metallogenic regularity, and the data of geophysical and geochemical survey, the following results have been achieved by combining with the recent prospecting discoveries of copper-nickel ore. The mineralization types are divides as five types:skarn type, hydrothermal type, porphyry type, magmatic liquation type and sedimentary metamorphism type. The skarn-hydrothermal-porphyry Cu-Pb-Zn-Mo deposit and magmatic liquation Ni-Cu-Co deposit are the most important metallogenic series in this area. The former is closely related to Late Triassic granitic magmatism, but the latteris closely related to mantle magmatic activity that occurred in the post-collision extensional tectonic setting.The prospecting potential in Binggounan area is analyzed by using the "Preferenceore-forming prediction".The results suggest that, the prospecting potential of hydrothermal type Pb-Zn-Cu deposit is huge respectively in the north part of No. Ⅲ mine belt, and the ones of magmatic liquation Ni-Cu-Co depositis good in the middle-north part of this mining area.

       

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