河南内乡板厂铜多金属硫化物矿床地质特征及成因分析

Geology characteristic and genetic analysis of Banchang Cu polymetallic sulphide deposit in Neixiang , Henan

板厂铜矿床位于东秦岭造山带内,区内出露地层主要为二郎坪群细碧岩类及秦岭群大理岩类。矿体地表呈带状分布,倾向上矿体呈层状、似层状、叠瓦状重复出现。矿体与围岩呈渐变过渡关系,矿层随含矿地层硅质岩展布而展布。对24种微量元素编制的配分图解中可以看出矿化层、矿化硅质岩、无矿化硅质岩、无矿化大理岩中的微量元素配分曲线有一定的相似性,同时发现矿化硅质岩中碳酸岩条带δ18 O结果为18.809‰～21.572‰,和海底喷流沉积δ18 O范围相近。通过研究分析,认为板厂铜多金属硫化物矿床成因为海底喷流沉积金属硫化物矿床。

Banchang Cu deposit locates inside eastern Qinling orogenic zone, and most exposure strata are spilite of Erlangping group and marble of Qinling group. The ore bodies are distributed in bands on the sur- face, and ore bodies that point upward occur repeatedly in layers, stratoid structure and imbricate arrange- ment. The correlation between ore body and wall rock is gradual transition, and the ore bed spreads with ore-bearing silicolite. It shows that the partition curves of mineralized strata, mineralized silicolite, non- mineralized silicolite and non-mineralized marble are similar to each other in light of the partition diagram of 24 microelements. It is also discovered that the result of ribbon carbonatite δ18O in silicolite is 18.80‰～21.572‰, and the result is similar to submarine sedimentation-exhalation. According to the analysis, the authors believe that the genesis of Banchang Cu polymetallic sulphide deposit is a submarine sedimentation-exhalation metal sulphides deposit.