摘要
对安庆夕卡岩型铁铜矿床中各成矿阶段的夕卡岩矿物、石英和方解石中流体包裹体的岩相学、显微测温及显微激光拉曼光谱分析等的研究结果表明,成矿流体可能为源自深部的岩浆热液,具高温、高盐度和富CH4等还原性挥发分的特征。流体包裹体的均一温度和盐度在夕卡岩期表现为高温(400～570℃)和高盐度(40%～46%NaCl)特征,代表了夕卡岩形成及铁矿化时的流体活动情况;在石英硫化物期表现出中低温(124～396℃),盐度变化较大(6%～38% NaCl)的特征,代表了铜矿化时的流体活动情况。从成矿早期到晚期,流体包裹体的均一温度和盐度都不断降低,且在铜的主成矿阶段曾发生过流体沸腾作用和混合作用。岩浆水在流体成矿过程中占主导地位。
Fluid inclusion study of Anqing skam-type Fe-Cu deposit shows that the ore-forming fluid belongs to NaCl-KCl-H2O solution system, and the primary ore-forming fluid is methane-rich magmatic hydrothermal fluid characterized by high temperature and high salinity. The fluid inclusions of the skarn-stage have high homogeneous temperatures （400 - 570 ℃ ） and high salinities （40% -46% NaCl）, indicating the fluid activities during skam formation and Fe mineralization process. The fluid inclusions of the quartz-sulfide stage have moderate- low homogeneous temperatures （124 - 396 ℃ ）, and large variation of salinities （6% - 38% NaCl）, indicating the fluid activities of Cu mineralization process. The homogeneous temperature and salinity of the fluid inclusions dropped from early to late ore-forming stages, and the boiling and mixing of fluids occurred in the main mineralizing stage of Cu. The magmatic water is dominant in the ore-forming process.
出处
《地球化学》
CAS
CSCD
北大核心
2008年第1期27-36,共10页
Geochimica
基金
中国科学院知识创新工程重要方向项目(KZCX2-102)
关键词
夕卡岩
铁铜矿床
流体包裹体
成矿机制
安庆
安徽省
skarn
Fe-Cu deposit
fluid inclusion
metallogenic mechanism
Anqing
Anhui Province
