摘要
杏枫山是湘中成矿带的一个代表性的金钨矿床,其金成矿时代、成矿物质来源与矿床成因尚存较大争议.在详细岩相学观察的基础上,借助LA-(MC)-ICP-MS分析手段,对该矿床席状含金石英细脉中的热液磷灰石开展原位U-Pb测年和载金毒砂的原位S同位素分析,以限定金矿化时代、示踪成矿物质来源,深化对矿床成因的认识.含金石英脉中热液磷灰石的U-Pb年龄为215.1±7.5 Ma,与白马山复式岩体的侵位时代一致.毒砂的δ34S值集中分布在-9.2‰~-7.7‰,表明成矿物质来自岩浆热液和围岩地层的混合.研究表明,杏枫山矿床W矿化和Au矿化均发生于晚三叠世,二者可能与白马山岩体具有密切的成因联系,杏枫山矿床应该属于与侵入岩有关的金矿床.
Xingfengshan is a representative gold-tungsten deposit in the Xiangzhong metallogenic belt.The age of gold mineralization,the source of ore-forming metals and the genesis of the deposit are still controversial.Based on detailed petrographic observation and LA-(MC)-ICP-MS analysis,in situ U-Pb dating of hydrothermal apatite and in situ S-isotope analysis of arsenopyrite in the auriferous quartz veins are carried out in this paper to constrain the age of gold mineralization, trace the source of ore-forming metals, and deepen the understanding of the genesis of the deposit. The U-Pb age of hydrothermal apatite in gold-bearing quartz veins is 215.1±7.5 Ma, which is consistent with the intrusion age of the Baimashan complex. The δ34S values of arsenopyrite are centrally distributed between -9.2‰ to -7.7‰, indicating that the ore-forming metal is derived from a mixture of magmatic-hydrothermal fluids and host rocks.. The study shows that the W mineralization and Au mineralization of the Xingfengshan deposit occurred in the Late Triassic, and both may be the products of magmatic activities of the Baimashan igneous complex, and the Xingfengshan deposit should belong to the intrusion-related gold deposit.
作者
娄元林
刘贤红
曾昊
郑卓
刘德亮
马慧敏
马盈
Lou Yuanlin;Liu Xianhong;Zeng Hao;Zheng Zhuo;Liu Deliang;Ma Huimin;Ma Ying(Changsha Natural Resources Comprehensive Survey Center,China Geological Survey,Changsha 410600,China;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;Collaborative Innovation Center for Exploration of Strategic Mineral Resources,School of Earth Resources,China University of Geosciences,Wuhan 430074,China)
出处
《地球科学》
CSCD
北大核心
2024年第12期4265-4277,共13页
Earth Science
基金
中国地质调查局“湖南怀化-邵阳金矿重点调查区调查评价”项目(No.DD20230386)
国家自然科学基金项目(No.42302087)
博士后创新人才支持计划(No.BX20230335)
湖北省自然科学基金面上类项目(No.2021CFB499)。
