| 大别地区梨木岭钼矿床成矿流体运移方向与成矿物质来源——流体包裹体和硫同位素约束 |
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| 引用本文：朱江,郭梦柯,李朋,季长军,陈超,戴竹,李新.2026.大别地区梨木岭钼矿床成矿流体运移方向与成矿物质来源——流体包裹体和硫同位素约束[J].地球学报,47(1):135-146. |
| DOI：10.3975/cagsb.2025.080111 |
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| 基金项目:由国家自然科学基金项目(编号: 42172103)、国家重大科技专项计划深地专项项目(编号: 2024ZD1001005)、湖北省自然科学基金项目 (编号: 2023AFD206; 2025AFD439; 2025AFD452)、资源与生态环境地质湖北省重点实验室开放基金项目(编号: HBREGKFJJ-202302; HBREGKFJJ-202403)和地质过程与矿产资源国家重点实验室科技部专项经费(编号: GPMR202424)联合资助。 |
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| 中文摘要:厘定成矿流体运移路径和热液矿化中心对矿床成因和找矿预测具有重要意义。利用流体包裹体显微测温技术的找矿案例值得进一步实践发掘。本文对大别山南麓梨木岭钼矿床开展了流体包裹体显微测温及硫化物原位微区硫同位素分析, 以揭示其成矿流体特征、物质来源及热液运移方向, 并推测热液活动中心。梨木岭钼矿床主成矿阶段流体具有中高温(270~322 ℃)、中等盐度(15.1%~22.7%)的特征。其初始成矿流体来源于岩浆热液, 在地壳浅部发生了与大气降水的混合, 导致了初始成矿流体的不混溶分离(210~300 ℃), 进而诱发金属物质卸载和沉淀。其矿石硫同位素δ34S值的变化范围为?0.35‰ ~ +6.07‰, 指示其来源于岩浆硫。综合认为, 梨木岭钼矿床属于中高温岩浆热液脉状矿床, 其主成矿阶段流体温度低于北淮阳地区的斑岩型钼矿床。根据成矿流体温度变化规律推测, 该矿区成矿流体在平面上从南西向北北东方向运移、从岩体外接触带向岩体内部运移。岩浆热液-矿化活动中心可能位于大同岩体外接触带。 |
| 中文关键词:成矿流体 运移方向 热液中心 硫同位素 钼矿床 大别山 |
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| Direction of Ore-forming Fluid Migration and Ore Sources in the Limuling Molybdenum Deposit in the Dabie Orogen: Insights from Fluid Inclusions and Sulfur Isotope |
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| Abstract:The evolution and tracing of ore-forming fluids remain key issues for ore deposit prospecting. In this paper, we present an integrated study of fluid inclusion and in situ sulfide sulfur isotope analysis for the Limuling molybdenum deposit in the southern margin of the Dabie Orogen to decipher its origins and trace its fluids. In the main hydrothermal mineralization stage, the ore-forming fluids were characterized by medium-high temperatures (270–322 °C) and moderate salinity values (15.1%–22.7%). The initial ore-forming fluids were derived from magmatic-hydrothermal systems and subsequently mixed with atmospheric water. Fluid mixing resulted in fluid immiscibility (210–300 ℃), and these factors could be the predominant factors in Mo mineralization in the Limuling deposit. The δ34S values of sulfides are positive values ranging from ?0.35‰ to +6.07‰, indicating magmatic sulfur origins. The Limuling deposit is considered to be a magmatic-hydrothermal lode molybdenum deposit formed under medium–high temperature. It shows lower ore-forming temperature than the Dabie-type porphyry Mo deposit in the northern Huaiyang area. We propose that ore-forming fluids moved along the NNE-trending fault. The magmatic-hydrothermal mineralization center is likely located at the external contact zone of the Datong intrusion, which should be a crucial area for Mo prospecting. |
| keywords:ore-forming fluids migration direction hydrothermal center sulfer isotope molybdenum deposit Dabie Orogen |
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