| 刘 畅.新疆西天山达巴特斑岩铜钼矿床成矿流体演化[J].地质与勘探,2016,52(5):799-814 |
| 新疆西天山达巴特斑岩铜钼矿床成矿流体演化 |
| The evolution of ore–forming fluid of the Dabate porphyry Cu–Mo Deposit in Western Tianshan, Xinjiang, China |
| 投稿时间：2016-06-30 修订日期：2016-08-20 |
| DOI： |
| 中文关键词: 流体包裹体 成矿流体演化 斑岩矿床 达巴特铜钼矿 西天山 |
| 英文关键词: fluid inclusions, the evolution of ore–forming fluid, porphyry deposit, Dabate Cu–Mo Deposit, Western Tianshan |
| 基金项目:国家自然科学基金(U1303292)、国家科技支撑计划(2011BAB06B02)和中国地质调查局工作项目(1212011085069)共同资助 |
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| 中文摘要: |
| 达巴特铜钼矿床位于天山造山带的北缘，赛里木地块的中部，成矿与晚石炭世–早二叠世浅成侵入体有关。对该矿床的矿石组构做了详细研究，并进行了流体包裹体显微测温和激光拉曼光谱分析。结果表明，流体成矿先后经历了辉钼矿–黄铜矿–石英脉（Ⅰ）、无矿石英脉（Ⅱ）、辉钼矿–石英脉（Ⅲ）和方解石–石英脉（Ⅳ）等4个阶段。在各阶段，包裹体均一温度分布范围是336.2~414.4℃、276.1~393.7℃、221.4~396.3℃、192.3~287.9℃，盐度为4.5~9.9%NaCl.eq、1.6~8.4%NaCl.eq、1.2~45.6%NaCl.eq、1.6~7.5%NaCl.eq，密度为0.57~0.76 g/cm3、0.54~0.80 g/cm3、0.51~1.11 g/cm3、0.76~0.91 g/cm3，随成矿流体温度、盐度降低，密度渐升，还原性增强。Ⅰ、Ⅲ阶段都发育矿化，包裹体具有明显的沸腾特征，且气相成分中均发现CO2，表明Ⅰ和Ⅲ阶段的流体沸腾可能导致金属沉淀，且CO2对金属运移可能具有重要作用。压力估算得到达巴特矿床Ⅰ、Ⅱ、Ⅲ、Ⅳ阶段脉体的成矿深度分别为0.5~1.1 km、0.3~1.0 km、0.5~1.0km、0.4~1.0km。矿体矿石、围岩蚀变和流体包裹体具有斑岩型矿床的特点。结合前人资料，认为达巴特为一典型斑岩型矿床。 |
| 英文摘要: |
| The Dabate Cu-Mo deposit is located in the middle of the Sailimu block, Northern Tianshan Orogenic. Its mineralizations relate with the hypabyssal intrusive rocks which were fromed during the Late Carboniferous and Early Permian. Through the detailed observation of ore fabric, microthermometry of fluid inclusions and laser Raman spectra of fluid inclusions in this deposit, it reveals that its fluid mineralizing has gone through 4 stages such as molybdenite–chalcopyrite–quartz vein(Ⅰ), barren quartz vein(Ⅱ), molybdenite–quartz vein(Ⅲ) and calcite–quartz vein(Ⅳ). From early stage to late stage, the inclusions have homogenization temperatures ranging from 336~414℃, 276~393℃, 221~396℃ and 192~287℃，salinities ranging from 4.5~9.9%NaCl.eq, 1.6~8.4%NaCl.eq, 1.2~45.6%NaCl.eq and 1.6~7.5%NaCl.eq and densities ranging from 0.57~0.76 g/cm3、0.54~0.80 g/cm3、0.51~1.11 g/cm3、0.76~0.91 g/cm3, their temperatures and salinities are gradually lower, their densities are gradually higher, and their reducibility is gradually stronger. The Ⅰ stage and Ⅲ stage both have the mineralization, and they both have the characteristic of fluid boiling, CO2 is found in vapor phase at Ⅰ stage and Ⅲ stage, this phenomenon can indicate that the fluid boiling can result in the precipitation of metal elements and CO2 has a significant effect on the metal-transport at these two stage. The pressure estimation in Dabate deposit shows that the depth is 0.5~1.1km, 0.3~1.0km, 0.5~1.0km and 0.4~1.0km from early stage to the late stage. The orebodies, ores, wall rock alterations and fluid inclusions have the characteristics of porphyry deposit. On the basic of the former date, the Dabate Cu-Mo deposit is a typical porphyry-type deposit. |
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