| 张龙升.额尔古纳地块七一牧场北山银铅锌矿床地质特征及其成因分析[J].地质与勘探,2021,57(1):64-72 |
| 额尔古纳地块七一牧场北山银铅锌矿床地质特征及其成因分析 |
| Geological characteristics and genesis of the Beishan silver-lead-zinc deposit in Qiyimuchang, Erguna Massif, Inner Mongolia |
| 投稿时间：2020-03-16 修订日期：2020-08-01 |
| DOI：10.12134/j.dzykt.2021.01.006 |
| 中文关键词: 矿床地质特征 晚侏罗世-早白垩世 中低温热液脉型银铅锌矿床 七一牧场北山矿床 额尔古纳地块 |
| 英文关键词: geological characteristics, late Jurassic to early Cretaceous, mesothermal and epithermal vein Ag-Pb-Zn deposit, Beishan, Qiyimuchang deposit, Erguna Massif |
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| 中文摘要: |
| 内蒙古七一牧场北山矿床是近年来额尔古纳地块新发现的一个中型银铅锌矿床。本文在野外地质勘查和室内综合整理分析的基础上，对该矿床的基本地质特征及成因进行了初步研究。该矿床银铅锌矿体赋存于中侏罗统塔木兰沟组安山质火山岩和上侏罗统满克头鄂博组流纹质火山碎屑岩中，呈脉状、细脉浸染状，受北西向、近南北向断裂构造控制，形成与晚侏罗世花岗斑岩、钾长花岗岩具有密切的时空联系。成矿作用在空间上表现出一定的分带性，伴随赋矿深度的增加，成矿元素呈现出由Pb→Pb、Zn、Ag→Zn、（Cu）的变化特点。结合硫、铅同位素及流体包裹体特征，初步认为该矿床应为晚侏罗世-早白垩世伸展环境下形成的、与火山-岩浆作用有关的浅成-超浅成中低温热液脉型银铅锌矿床。 |
| 英文摘要: |
| The Beishan deposit in Qiyimuchang, Inner Mongolia is one of the medium-size silver-lead-zinc deposits found in the Erguna Massif recent years. Based on field investigations and exploration, this paper studies the geological characteristics and genesis of this deposit. Results suggest that its Ag-Pb-Zn orebodies are hosted in the andesitic volcanic rocks of the Middle Jurassic Tamulangou Formation and rhyolitic pyroclastic rocks of the Upper Jurassic Manketouebo Formation, appearing as veins and veinlet-dissemination shapes which are controlled by northwest- and north-trending fault zones, spatially and temporally associated with the emplacement of granitic porphyry and potassic granite. The mineralization has a feature of zoning in space, with increasing depth, the major mineralizing elements transform from Pb→Pb, Zn, Ag→Zn（Cu）. Considering the features of the sulfur isotope lead isotope compositions and fluid inclusions, this work suggests that the deposit can be attributed to the volcanic-magma mesothermal and epithermal vein Ag-Pb-Zn type which formed in an extensional tectonic setting during Late Jurassic to Early Cretaceous. |
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