摘要
西范坪斑岩铜矿成矿母岩为黑云母石英二长斑岩，其多相流体包裹体中普遍含有黄铜矿子矿物，成矿流体是一种富含铜（约20000×10-6）的H2O－NaCl体系，具有高温（470－590℃）、高盐度[55％－65％（NaCl）]和沸腾的特征，多相包裹体捕获的最小压力51MPa左右，成矿流体水的氧同位素组成与典型岩浆水一致，黄铁矿的S、Pb同位素表明成矿物质主要来自深源岩浆，所有这些特点吻合于麻岩铜矿的正岩浆模式．多相流体包裹体发育的部位曾经是高盐度高矿质流体活动的地方，这种包裹体是一种良好的找矿标志．
Ore-forming source rock of the Xifanping porphyry copper deposits is the biotiteadamellite. The polyphase fluld inclusions in the deposit commonly contain daughtermineras of chalcopyrite. Ore-forming flind is a kind of H2O-NaCl systemcharacterized by high copper content (about 20000 ×10-6) and high temperature (470-590℃), high salinity [55%-65% (NaCl)], and boiling fluid. A mininum trap pressureof polyphase fluid inclusions is about 51 MPa. The Oxygen isotopic composition ofthe ore-forming solution is consistent with that of magmatic water. Pb and S isotopesof pyrite show that the ore-forming marerials were mainly derived from deep sourcemagma. All the characteristics suggest that the deposit is of the genesis oforthomagmatic model. In the area where polyphase fluid inclusions developed, thefluld of high salinity and high ore-forming element actived. Therefore, such a kind ofpolyphase fluid inclusion can be considered as a good sign of exploring porphyrycopper deposits.
出处
《地球化学》
CAS
CSCD
北大核心
1997年第5期54-61,T001,共9页
Geochimica
基金
国家教育委员会博士点基金
南京大学成矿作用国家重点实验室联合资助
关键词
铜矿床
斑岩铜矿
富铜流体
物理化学
矿床成因
polyphase fluid inclusions, chalcopyrite daughter minerals, p-t-X Characteristics, orthomagmatic genesis
