| 高 轲.西藏拿若铜（金）矿床隐爆角砾岩流体包裹体研究[J].地质与勘探,2016,52(5):815-825 |
| 西藏拿若铜（金）矿床隐爆角砾岩流体包裹体研究 |
| Fluid inclusion study of the cryptoexplosive breccias in the Naruo Cu (Au) deposit of Tibet |
| 投稿时间：2016-05-12 修订日期：2016-08-21 |
| DOI： |
| 中文关键词: 流体包裹体 隐爆角砾岩 拿若 西藏 |
| 英文关键词: fluid inclusions, cryptoexplosive breccia, Naruo, Tibet |
| 基金项目:国土资源部公益性行业科研专项项目(201511017)，国家自然科学青年基金（41402178），地质调查子项目（12120115028101，12120115102301），科技基础性工作专项（2014FY121000)联合资助 |
|
| 摘要点击次数: 2377 |
| 全文下载次数: 169 |
| 中文摘要: |
| 隐爆角砾岩是拿若矿床的重要组成部分，存在厚大的铜矿体。笔者将隐爆角砾岩中流体分成两个主要期次，并对这两期流体开展包裹体研究。通过包裹体岩相学和显微测温认为：角砾中的石英（早期）包裹体形状均匀呈椭圆形，大小主要在2~5μm；胶结物中石英（晚期）包裹体形状可见椭圆状、长条状和近方形，大小主要在2~7μm。早期流体的包裹体可分为两个阶段，均一温度分别为早阶段280~368℃和晚阶段 208~305℃，盐度分布为4.65~12.73% NaCleq。晚期流体的包裹体同样可分为两个阶段，其均一温度分别为早阶段309~588℃和晚阶段232~335℃，盐度变化为3.55~12.51% NaCleq，两个阶段的流体分别属于高温、中低盐度和中高温、中低盐度流体。L-V型包裹体激光拉曼分析显示：包裹体中气泡成分主要为气态H2O和少量CO2。拿若矿床至少发生过两次隐爆作用，由晚期沸腾热液引起，并未成矿。成矿作用发生于隐爆角砾岩形成之后。 |
| 英文摘要: |
| Cryptoexplosive breccia is an important part of the Naruo deposit, including a large copper ore body. We divide the fluid in this breccia into two main periods and carry out a detailed study on its fluid inclusions. Inclusion petrography and microthermometry suggest that the quartz from breccia (early phrase) inclusion is of an oval shape and uniform, most of the sizes between 2 and 5μm. The shape of quartz from cement (late phrase) inclusions is like oval, strip and square, most of the sizes between 2 and 7μm. The early inclusion is divided into two phases, of which homogenization temperatures 280~368℃ (early phase) and 208~305℃ (late phase), respectively, with salinity 4.65~12.73%NaCleq. The late inclusion is divided into two phases too, with homogenization temperatures 309~588℃ (early phase) and 232~335℃ (late phase), and salinity 3.55~12.51%NaCleq. Two phases of late inclusions are respectively high temperature, medium-low salinity and medium-high temperatures, and medium-low salinity. Laser Raman of type L-V inclusions shows that the bubble components are mainly gaseous H2O and a little CO2. Concealed explosive occurred at least tow times at the Naruo deposit by late boiled fluid, which did not generate ore. Mineralization took place after the formation of cryptoexplosive breccia. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
