| 滇东北乐红大型铅锌矿床流体包裹体地球化学 |
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| 引用本文： | 赵冻,韩润生,任涛,王加昇,吴海枝,张小培,崔峻豪.滇东北乐红大型铅锌矿床流体包裹体地球化学[J].矿床地质,2018,37(5):1018-1036. |
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| 作者姓名： | 赵冻 韩润生 任涛 王加昇 吴海枝 张小培 崔峻豪 |
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| 作者单位： | 昆明理工大学国土资源工程学院;有色金属矿产地质调查中心西南地质调查所 |
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| 基金项目： | 本文得到国家自然科学基金项目（编号：41572060、U1133602）、中国地调局整装勘查综合研究项目（编号：12120114013901）、云南省矿产资源预测与评价工程实验室（编号：2011）和云南省昆明理工大学创新团队项目（编号：2012、2010）联合资助 |
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| 摘 要： | 乐红铅锌矿床是扬子地块西南缘滇东北铅锌(银)多金属矿集区中的典型代表之一。通过对该矿床不同成矿阶段闪锌矿、石英、重晶石和方解石中流体包裹体岩相学、显微测温学和显微激光拉曼探针等测试,阐述了该矿床成矿流体性质和演化特征,并探讨了其成矿过程。研究发现,该矿床流体包裹体主要包括4类:Ⅰ类气相、Ⅱ类水溶液相(由Ⅱa型-富液相气液两相、Ⅱb型-富气相气液两相、Ⅱc型纯液相组成)、Ⅲ类含CO_2三相(V_(CO_2)+L_(CO)+L_(HO))及Ⅳ类含子矿物(L+V+S)包裹体。结果显示,重晶石阶段的均一温度为240.3~319.3℃,w(NaCl_(eq))为2.24~2%~1~20.73%,表现出中高温-中低盐度流体性质;白云石-黄铁矿-石英阶段具有中-高温(219.8~310.1℃),中盐度(w(NaCl_(eq))为7.02%~17.61%)特征;闪锌矿-方铅矿-黄铁矿阶段,包括S1闪锌矿具有中温(217.8~292.2℃)-中盐度(w(NaCl_(eq))为8.81%~16.71%)性质;S2闪锌矿具有中低温(180.2~241.3℃)-中盐度(w(NaCl_(eq))为7.73%~18.47%)性质;S3闪锌矿具有中低温(140.4~227.4℃)-中低等盐度(w(NaCl_(eq))为0.35%~19.21%)的流体性质,通过该阶段中含CO_2三相包裹体测试,估算成矿压力和成矿深度分别为45~74.9 MPa(平均58.2 MPa)、1.7~2.8 km。方解石阶段均一温度为165.3℃,中等盐度,w(NaCl_(eq))为11.28%,表现出低温-中等盐度的特征。不同成矿阶段的包裹体温度大致反映了该矿床成矿流体从早阶段至晚阶段,呈现中高温、中低盐度→中温、中等盐度→中低温、中低盐度的演化过程;早期高温-低盐度深部流体在热动力和构造应力驱动下大规模运移,受断裂构造影响发生减压沸腾作用,同时与大气降水发生混合,成矿流体物化性质陡变引起铅锌硫化物等的沉淀,并最终形成矿床。该研究为揭示矿床流体性质、演化及矿床成因提供了证据,深化了"构造-流体‘贯入’成矿"模型,亦对深化矿床成矿机制与指导找矿预测具有重要意义。
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| 关 键 词： | 地球化学 成矿过程 热液成矿阶段 乐红铅锌矿床 滇东北矿集区 |
| 收稿时间： | 2016/12/12 0:00:00 |
| 修稿时间： | 2017/2/5 0:00:00 |
Characteristics of fluid inclusions geochemistry of Lehong large-sized Pb-Zn ore deposit, northeastern Yunnan Province |
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| ZHAO Dong,HAN RunShen,REN Tao,WANG JiaSheng,WU HaiZhi,ZHANG XiaoPei and CUI JunHao.Characteristics of fluid inclusions geochemistry of Lehong large-sized Pb-Zn ore deposit, northeastern Yunnan Province[J].Mineral Deposits,2018,37(5):1018-1036. |
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| Authors: | ZHAO Dong HAN RunShen REN Tao WANG JiaSheng WU HaiZhi ZHANG XiaoPei and CUI JunHao |
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| Institution: | Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China,Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China,Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China,Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China,Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China,Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China and Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China |
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| Abstract: | |
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| Keywords: | Thegeochemistry ore-forming process metallogenic stage Lehong Pb-Zn deposit northeastern Yunnan ore concentration area |
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