河南桐柏大河黄铁矿型铜矿床成因特征

本文在讨论大河矿床容矿岩石、矿床地质特征的基础上,探讨了矿床的形成环境和成因。根据容矿岩石一细碧角斑岩的碱度特征。矿床的地质特征、矿石结构和构造、硫和铅同位素组成等特征的讨论,作者认为细碧角斑岩系形成于弧后盆地优地槽环境,矿床成因与下古生代海底火山作用有关,为海底火山热液—沉积矿床。对矿体下伏火山岩中的成矿金属含量与矿床中的成矿金属含量的对比,以及对黄铁矿和重晶石的硫同位素组成两者关系的讨论,推测了成矿物质的来源。最后,与国内外同类矿床对比,大河矿床与我国白银厂、苏联南乌拉尔黄铁矿型铜矿床较为相似。

FEATURES OF THE GENESIS OF THE CUPREFEROUS PYRITE DEPOSIT AT DAHE, TONGBAI, HENAN PROVINCE

Based upon the investigation on the geological features of the Dahe deposit and its host rocks, this paper discusses the environment and origin of the ore deposit. According to the features of the host rock series-alkalimity of the spilitekeratophyre suite, the character of the ore deposits, ore structure-texture and the sulfur and lead isotopic composition, the author suggests that the spilitekeratophyre suite was generated in the environment at the bock arc-basin type engeasyncline and that the Dahe massive sulfide deposit belongs to the volcanic hydrothermal-sedimentary deposits on the ocean floor. The relation between the volcanic rocks beneath ore bodies and the deposit in ore-forming metal content and the pyrite and barite suffur isotopic composition reveal the source of the ore matter. Finally, compared with its counterparts at home and overseas the Dahe massive sulfide deposit is guite similar to the ones in Baiyinchang, China, and in South Ural.