摘要
对赋存于南秦岭泥盆系浅变质碎屑岩中的陕西太白金矿、凤县八卦庙金矿主成矿阶段的石英和含铁白云石中的流体包裹体进行研究 ,发现局部富含高盐度、含子矿物的流体包裹体 ,通过光学显微镜、电子探针 (EPMA)、扫描电镜 /能谱(SEM/EDS)发现子矿物主要为黄铁矿、铁白云石、石盐、毒砂及一些成分复杂的子矿物。认为矿床成矿流体具复杂的物理化学条件 ,不同于一般的热液金矿床。结合矿床形成的大地构造位置分析、主成矿阶段矿物组成特点、热液成因金属硫化物中高PGE含量特点、矿石中碳酸盐矿物中稀土元素配分曲线。
High salinity fluid inclusions containing daughter minerals have been found in quartz and ankerite of main mineralizing stages, Taibai and Baguamiao gold deposits of Shaanxi province, located in South Qinling. Both deposits occur in Devonian low grade metamorphic rocks. Daughter minerals were detected as pyrite, ankerite, halite and arsenopyrite by SEM/EDS and EPMA. It is concluded that ore forming fluid was formed under complex physico chemical conditions. According to the tectonic setting, mineral association of main mineralizing stages, high PGE content in hydrothermal sulfides, Chondrite normalized REE pattern of carbonate cement from Taibai gold deposit, carbon isotope characteristics, it is believed that ore forming fluid has a deep (mantle) source.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第4期655-660,共6页
Acta Petrologica Sinica
基金
国家自然科学基金项目 (49972 0 3 1)
陕西省太白金矿
北京科技大学科研项目资助
关键词
金矿床
泥盆系
高盐度流体包裹体
深源流体
地质
Gold deposits, Devonian, South Qinling, High saline aqueous inclusion, Deep source fluid
