贵州架底卡林型金矿床磷灰石的地球化学及U-Pb年代学研究
Geochemistry and U-Pb geochronology of apatite from the Jiadi carlin-type gold deposit in the southwestern Guizhou,China
杨毓红 1刘燊 2刘建中 3王泽鹏 4杨成富 4杨朝贵 5叶春 6龚兴祥6
作者信息
- 1. 西北大学地质学系,大陆动力学国家重点实验室,西安 710069;贵州省土地矿产资源储备局,贵阳 550004;自然资源部基岩区矿产资源勘查工程技术创新中心,贵阳 550081
- 2. 西北大学地质学系,大陆动力学国家重点实验室,西安 710069
- 3. 自然资源部基岩区矿产资源勘查工程技术创新中心,贵阳 550081;贵州省地质矿产勘查开发局,贵阳 550004
- 4. 贵州省地质矿产勘查开发局105地质队,贵阳 550018
- 5. 贵州省有色和核工业地质矿产勘查院,贵阳 550000
- 6. 贵州省土地矿产资源储备局,贵阳 550004
- 折叠
摘要
贵州架底卡林型金矿是以玄武岩为容矿岩石的卡林型金矿床.对该类不同于黔西南沉积岩容矿的卡林型金矿,其年代学研究仍未涉及,本研究通过对架底矿床中矿化样与矿区外未蚀变玄武岩进行TIMA矿物自动分析对比,选择架底矿床与成矿有关的热液成因磷灰石开展电子探针及原位微量及U-Pb定年分析显示,热液磷灰石呈MREE富集特征,其U-Pb时代为(155.2±9.4)Ma,与黔西南沉积岩容矿卡林型金矿床热液磷灰石、热液方解石、萤石、白云石的地球化学特征及成矿时代一致,表明黔西南地区玄武岩容矿和沉积岩容矿的卡林型金矿床均形成于燕山期太平洋板块向欧亚大陆俯冲后,岩石圈拉伸减薄软流圈物质上涌导致的华南大规模的岩浆及成矿作用形成的成矿动力学背景.
Abstract
The Jiadi gold deposit is a typical representative of Carlin-type Au deposits with its ores hosted in basaltic rocks.However,the geochronological study of the basalt-hosted Carlin-type gold deposit which are different to the sedimentary rocks-hosted deposits in the Southwestern Guizhou has not been addressed.In this paper,based on the comparative study of mineralized basalt samples in the Jiadi deposit and unaltered basalt samples outside of the deposit by employing the TIMA Integrated Mineral Analyzer,we have carried out the EPMA analysis,in-situ LA-ICP-MS trace element analysis and U-Pb dating of hydrothermal apatites associated with the gold mineralization in the Jiadi deposit.The results indicate that the hydrothermal apatite in the deposit is characterized with the enrichment of middle rare earth elements(MREE),and its U-Pb age is 155.2±9.4Ma,which are respectively consistent with geochemical characteristics and metallogenic ages of hydrothermal apatite,hydrothermal calcite,fluorite,and dolomite in the sedimentary rocks-hosted Carlin-type gold deposits in the southwestern Guizhou.These characteristics suggest that both the basalt-hosted and sedimentary rocks-hosted Carlin-type gold deposits in the southwestern Guizhou were formed in the regional metallogenic dynamic background of the southwestern Guizhou which resulted from extensive magmatisms and mineralizations in South China which were led by the lithospheric stretching and thinning and the upwelling of asthenospheric materials due to the subduction of the Pacific plate toward the Eurasia plate during the Yanshanian period.
关键词
热液磷灰石/玄武岩容矿卡林型金矿/成矿年代学/地球化学Key words
hydrothermal apatite/the basalt-hosted Carlin-type Au deposit/metallogenic chronology/geochemistry引用本文复制引用
出版年
2024
NETL
NSTL
万方数据