【摘要】 朝山金矿床位于安徽铜陵狮子山矿田内,与成矿相关的侵入岩体为白芒山辉石闪长岩。文章通过对朝山金矿床矿石矿物含金性和方解石-黄铁矿脉内方解石及碳酸盐岩全岩碳、氧同位素研究,探讨朝山金矿床中金的赋存状态和矿床成因。矿石矿物电子探针测试表明,朝山金矿床矿石矿物中毒砂、磁黄铁矿和黄铁矿含金性较好。C,O同位素测试表明,方解石-黄铁矿脉内方解石中的δ(13CPDB)=-2.57×10-3~-4.87×10-3,δ(18OPDB)=-15.68×10-3~-17.33×10-3,δ(18OSMOW)=13.05×10-3~14.74×10-3,碳酸盐岩全岩中δ(13CPDB)=0.88×10-3~1.97×10-3,δ(18OPDB)=-7.55×10-3~-9.12×10-3,δ(18OSMOW)=21.46×10-3~23.08×10-3,说明朝山金矿床的成矿物质主要来源于岩浆或深部地壳流体。伴随着成矿作用的进行,朝山金矿床经历了从高温到低温热液蚀变过程,同时混入了地壳上部沉积物。更多还原

【Abstract】 Chaoshan gold deposit is located at the Shizishan ore-field in Tongling,Anhui Province and the host rock is the Baimangshan augite diorite.Gold abundance of the ore minerals and carbon and oxygen isotopic composition of calcite in the calcite-pyrite veins and the whole rock sample of sedimentary carbonate rock were measured in order to interpret the occurrence of gold and genesis of Chaoshan ore deposit.The EMPA results of the ore minerals indicated that the gold was preferable in arsenopyrite,pyrrhotite and pyrite.Carbon and oxygen isotopic analysis of the calcite mentioned above is δ(¹³C_PDB)=（-2.57）×10^-3 to-4.87×10^-3,δ(¹⁸O_PDB)=-15.68×10^-3 to-17.33×10^-3,δ(¹⁸O_SMOW)=13.05×10^-3 to 14.74×10^-3 respectively and δ(¹⁸O_PDB was -15.68×10^-3 to-17.33×10^-3 and-7.55×10^-3 to-9.12×10^-3 of the whole rock sample,corresponding to 13.05×10^-3 to 14.74×10^-3 and 21.46×10^-3 to（23.08）×10^-3（SMOW standard）.These results indicated that the principal ore-forming elements came from magma and /or fluid derived from deeper crust and were altered by hydrothermal fluid from high temperature to low during the ore-forming process and also assimilated with some sediments from upper crust.更多还原