| 高俊宝.新疆东天山石东金矿床成因及找矿标志[J].地质与勘探,2023,59(3):521-532 |
| 新疆东天山石东金矿床成因及找矿标志 |
| The Genesis and Prospecting Indicators of the Shidong Gold Deposit in East Tianshan, Xinjiang |
| 投稿时间：2021-10-25 修订日期：2022-10-20 |
| DOI：10.12134/j.dzykt.2023.03.004 |
| 中文关键词: 东天山 石东金矿 矿床成因 控矿因素 找矿标志 |
| 英文关键词: East Tianshan, Shidong gold deposit, ore genesis, ore-controlling factor, prospecting indicator |
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| 中文摘要: |
| 康古尔韧脆性剪切活动控制着东天山二叠纪大规模的金成矿作用。新发现的石东金矿位于东天山康古尔韧性剪切带西段，赋存于石炭系凝灰质砂岩与石炭纪正长斑岩接触带。根据该矿床矿物共生组合和事变类型成矿过程可分为黄铁矿-绢云母-石英阶段（Ⅰ）、石英-多金属-自然金阶段（Ⅱ）和绿泥石-方解石-石英阶段（Ⅲ），主成矿阶段（Ⅱ）以粗大石英硫化物脉、中温热液蚀变为特征。载金硫化物及自然金电子探针数据显示该矿床与中低温变质热液活动关系密切，认为是二叠纪康古尔韧性剪切活动过程中形成的金矿床。石东正长斑岩（平均K2O = 8.8%）富集大离子亲石元素且具有较低的Mg#值（平均为30.8），认为其起源于康古尔增生杂岩部分熔融，与石东金矿没有直接成因联系。康古尔剪切带内地层-岩浆-构造活动均对二叠纪大规模金成矿事件有贡献，石炭纪碱性花岗侵入体与二叠纪脆-韧性变形是重要找矿标志。 |
| 英文摘要: |
| The Kanggur ductile-brittle shear activity controls the Permian large-scale Au mineralization in the eastern Tianshan. The newly-discovered Shidong Au deposit is located in the western segment of the Kanggur ductile shear zone, which is hosted in the contact zone of the Carboniferous tuffaceous sandstone and syenite porphyry. According to the mineral assemblage, the mineralization processes of the Shidong gold deposit can be divided into pyrite-sericite-quartz (I), quartz-multi-metals-native gold (II) and chlorite-calcite-quartz (III) stages. The main mineralization stage (II) is characterized by coarse quartz-sulfides veins, medium-temperature hydrothermal alteration. The electronic probe data of gold-bearing sulfides and native gold indicate a medium-low-temperature metamorphic origin, and the Permian Kanggur ductile shear activity shows a close genetic linkage with the Shidong Au deposit. The Shidong syenite porphyry (average K2O = 8.8%) possesses high contents of large ion lithophile elements and low Mg# ratios (average is 30.8), which indicates a magmatic origin derived from partial melting of the Kanggur accretionary complexes and no direct genetic relationship with the Shidong gold deposit. The Carboniferous strata and magmatism and the Permian regional deformation activity are essential for the generation of the large-scale Au mineralization in the eastern Tianshan. The Carboniferous alkaline granitoids intrusion and ductile-brittle deformation are important indicators for further Au exploration. |
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