| 东昆仑东段中-晚三叠世区域岩浆-热液成矿系统 |
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| 引用本文： | 井国正,王晓云,张志强,何俊江,张里斌,王凤林,刘颜,石文杰,谭俊.东昆仑东段中-晚三叠世区域岩浆-热液成矿系统[J].地质科技通报,2023,42(1):89-111. |
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| 作者姓名： | 井国正 王晓云 张志强 何俊江 张里斌 王凤林 刘颜 石文杰 谭俊 |
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| 作者单位： | 1.青海省有色第三地质勘查院, 西宁 810012 |
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| 基金项目： | 青海省东昆仑东段金银多金属成矿系列研究与关键勘查技术应用示范项目青色地[2021]34号 |
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| 摘 要： | 东昆仑成矿带在早中生代发生了大规模的成矿作用，形成了一系列脉状金矿床、脉状银铅锌矿床、斑岩型铜钼矿床和矽卡岩型铁多金属矿床，但这些矿床之间的成因联系尚不清楚。东昆仑东段以其多样的矿床类型为这一科学问题的研究提供了理想场所。在总结归纳东昆仑东段主要类型矿床时空分布和地质特征的基础上，通过系统分析各类矿床的成矿时代、成矿构造背景及成矿流体与物质来源，探讨它们之间的成因联系。研究结果显示，东昆仑东段各类矿床主要形成于中-晚三叠世(240~220 Ma)，均是东昆仑古特提斯陆陆碰撞及后碰撞伸展作用的产物。此外，区内及外围东昆北地体中的各类矿床均具有相似的成矿流体与成矿物质来源，且与该时期广泛发育的深部岩浆作用密切相关，共同组成了一个巨型的岩浆-热液成矿系统，不同类型的矿化可能是该岩浆-热液系统不同演化阶段的产物。巴颜喀拉板块深俯冲及板块断离诱发软流圈地幔的上涌及随后的大规模岩浆-流体活动，富含金属挥发分的岩浆热液与上地壳的岩石和流体发生交代和流体混合，最终形成区内巨型的岩浆-热液成矿系统。基于该成矿系统，东昆仑东段具有寻找多类型共生矿床的潜力。
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| 关 键 词： | 金矿床 斑岩-矽卡岩型 成因联系 岩浆-热液成矿系统 找矿方向 东昆仑东段 |
| 收稿时间： | 2021-05-24 |
Middle-Late Triassic regional-scale magmatic-hydrothermal metallogenic system in the eastern segment of the East Kunlun |
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| Institution: | 1.The Third Nonferrous Geological Exploration Institute of Qinghai Province, Xining 810012, China2.Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China3.College of Resources and Environment, Yangtze University, Wuhan 430100, China4.School of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China |
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| Abstract: | A large-scale mineralization occurred in the East Kunlun during the Early Mesozoic, forming a series of lode gold, quartz vein-type Ag-Pb-Zn, porphyry Cu-Mo, and skarn Fe polymetallic deposits. However, the genetic link between these deposits is still unclear. The eastern segment of the East Kunlun has diverse types of deposits which provides an excellent opportunity to decipher the genetic link. Here we summarize the geological features and spatial-temporal distribution of the major types of deposits in the eastern segment of the East Kunlun, and discuss their metallogenic ages, tectonic settings, and sources of ore-forming fluids and materials to explore possible genetic links between them. The results show that they were mainly formed in the Middle-Late Triassic (240-220 Ma), controlled by the Paleo-Tethys continental collision and post-collision extension. Additionally, these different types of deposits in the study area and the surrounding Northern East Kunlun Terrane have similar metal and fluid sources. They are closely related to the extensive deep magmatism developed during this period. We suggest that these deposits formed a giant magmatic-hydrothermal metallogenic system, and different mineralization types might be the products of different evolution stage. The deep subduction and break-off of the Bayankura Plate induced the upwelling of the asthenospheric mantle and the subsequent large-scale magmatic-fluid activities. The metal- and volatile-rich hydrothermal fluids extensively interacted with upper crustal rocks and shallow-derived fluids, and formed a regional-scale magmatic-hydrothermal metallogenic system. Based on the metallogenic system, the eastern segment of the East Kunlun has potential for multi-type paragenetic deposit exploration. |
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