| 胡传胜.蒙古国满都拉探矿区地质特征及流体包裹体研究[J].地质与勘探,2014,50(6):1164-1172 |
| 蒙古国满都拉探矿区地质特征及流体包裹体研究 |
| Geologic features and fluid inclusions in the Mandula exploration area, Mongolia |
| 投稿时间：2014-02-12 修订日期：2014-05-23 |
| DOI： |
| 中文关键词: 地质特征 流体包裹体 满都拉探矿区 蒙古国 |
| 英文关键词: geologic feature, fluid inclusion, Mandula exploration area, Mongolia |
| 基金项目:国家重点基础研究发展规划973项目（编号:2013CB429801）资助 |
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| 中文摘要: |
| 满都拉探矿区位于蒙古国南戈壁省满都拉苏木。矿区地表中元古界白云岩中出露大面积含孔雀石、蓝铜矿和辉铜矿的硅化蚀变带，含铜矿物与石英脉在空间上紧密共生，石英中的流体包裹体可能保留了原生成矿流体特征。为确定其成矿地质体和成因类型，指导后续找矿工作，本文对硅化蚀变带中的石英进行了流体包裹体研究。根据石英中包裹体的产状可将包裹体分为早晚两个阶段，早阶段富含CO2（C型）和水溶液（W型）包裹体，偶见含子矿物（S型）包裹体，流体均一温度为195~384℃，盐度为2.77%~21.37%NaCl.eqv，反映了原生成矿流体的特征。晚阶段仅出现水溶液（W型）包裹体，流体均一温度集中在95~213℃，盐度为1.27%~12.63%NaCl.eqv。流体由早阶段的中高温、中盐度、富CO2流体向晚阶段低温、低盐度、贫CO2流体演化。据此推测成矿流体可能为岩浆流体，流体形成深度大约在5.7km以上。 |
| 英文摘要: |
| The Mandula exploration area is located in Sumu, Mandula, South Gobi Province, Mongolia. A wide expanse of silicified alteration belts bearing malachite, azurite and chalcocite is exposed in the upper Proterozoic dolomite on the surface of the ore field. Cu-bearing minerals are closely associated with quartz veins in space. The fluid inclusions in the quartz may preserve the characteristics of original ore-forming fluids. In order to determine the ore-forming geological body and genetic types and guide further ore prospecting, a fluid inclusion study for Cu-bearing quartz from the silicified alteration belt was carried out. According to the occurrence, the fluid inclusions are divided into early and late stages. There are mainly two types of fluid inclusions, i.e.CO2-H2O（C-type）and NaCl-H2O （W-type） fluid inclusions with minor daughter mineral-bearing multiphase inclusion（S-type） in the early stage. The homogeneous temperatures and salinities of these fluid inclusions vary from 195℃ to 384℃ and from 2.77 % to 21.37 % NaCl equivalent, respectively, which reflect the characteristics of original ore-forming fluids. Only NaCl-H2O （W-type） fluid inclusions are found in the late stage, with homogeneous temperatures of 95~213℃ and salinities of 1.27 % to 12.63 % NaCl equivalent. The results indicate that the ore fluid evolved from medium-high temperature, medium salinity and rich CO-2 in the early stage to low temperature, low salinity and poor CO-2 in the late stage. We infer that the ore fluids might be magmatic fluids and the ore-forming depth was more than 5.7 km. |
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