地质学报2023，Vol.97Issue(11)：3651-3672,22.DOI:10.19762/j.cnki.dizhixuebao.2023154
新疆可可托海稀有金属矿床成因和南部地区隐伏矿预测
Genesis of Koktokay rare metal deposit(Xinjiang)and concealed orebody forecast in its southern district:Evidence from geology,remote sensing and geophysics
摘要
Abstract
The Koktokay in Xinjiang is a famous pegmatitic-type rare metal deposit.The genesis of the pegmatites has been controversial,and the rare-metal resources have been exhausted for many years.Hence,breakthroughs are urgently needed in both theory and prospecting.In this study,we conducted geological and geochemical research on the Middle Ordovician metamorphic rocks of Habahe Group and Triassic rare-metal granites in the mining area,as well as remote sensing data interpretation,geophysical investigation,and hidden ore prediction.The metamorphic rocks of the Habahe Group are mainly composed of mica schist.Their trace element contents are similar to that of the continental crust.It is impossible to directly form mineralizing magma through partial melting of these metamorphic rocks.The Triassic rare-metal granite mainly consists of muscovite albite granite with minor albite granite,which originated from a deep magma chamber.During the upward migration process,the magma underwent crystallization and flow differentiation to form volatile-rich,highly differentiated magmas,and then intruded locally to form rare-metal granite branches.There is a granite-pegmatite system at Koktokay.Various remote sensing data interpretation results show several ring images in the Koktokay area which could indicate the ring structures at depth.The pegmatites and rare-metal granites occurred in these ring structures,indicating that the host magmatic activity at Koktogay is likely associated with the ring structures.The magnetotelluric(MT)shows that there are low-resistivity anomalous bodies below 15 km at depth,which could be a residual magma chamber or melting zone where the granite magma derived.The audio-frequency magnetotelluric(AMT)shows significant low-resistivity anomalous bodies occur at depth.Based on these results of the geological,remote sensing,and geophysical research,we predict that there might be fault-magma channels in depth of ring-shaped structures,where granitic magma and related rare metal orebodies could be developed.关键词
哈巴河群片岩/稀有金属花岗岩/花岗岩-伟晶岩成矿系统/环形构造/遥感异常/地球物理异常/隐伏矿Key words
Habahe Group metamorphic rock/rare-metal granite/granite-pegmatite system/ring-shaped structure/remote sensing anomalies/geophysical anomalies/concealed orebody引用本文复制引用
申萍,白应雄,何兰芳,荆林海,潘鸿迪,冯浩轩,罗耀清,李昌昊,马华东,曹冲..新疆可可托海稀有金属矿床成因和南部地区隐伏矿预测[J].地质学报,2023,97(11):3651-3672,22.基金项目
本文为国家自然科学基金项目(编号91962213)、中国科学院国际合作局国际伙伴计划项目(编号132A11KYSB20190070)、上海合作组织国际科技合作计划项目(编号2020E01043)、新疆维吾尔自治区人民政府国家305项目办项目和新疆维吾尔自治区"天池英才"引进计划项目联合资助的成果. （编号91962213）
