湘、桂地区碳硅泥岩型金矿床成矿地质条件

产于碳质硅岩、碳质泥（板）岩、泥质板岩、粉砂质板岩及不纯的碳酸岩盐中的金矿床，因与碳硅泥岩型铀矿含矿主岩很相似并有一定的共生关系，将该类金矿床称之为碳硅泥岩型金矿。其含矿主岩属裂谷构造环境下形成的海相热水沉积产物－碳硅泥岩系，该类矿床的形成与沉积其后 的构造改造有关，多数与岩体关系不明显。对湘中桂北地区碳硅泥岩型金矿床成矿地质条件的研究，总结出该类金矿床形成的三个阶段；（１）矿源层金的原始富集，（２）构造改造－热液成矿阶段蚀 变带富集，（３）表生氧化改造富集。

METALLOGENIC GEOLOGICAL CONDITIONS OF CARBONACEOUS-SILICEOUS-ARGILLACEOUS ROCK-HOSTED GOLD DEPOSITS IN CENTRALHUNAN AND NORTHERN-GUANGXI

Carbonaceous-siliceous-argillaceous rock-hosted gold deposits, which are also called CSA-type gold deposits, are referred to as those located in carbonate rocks, argillaceous rocks, carbonaceous silicalited and siltstone. They are similar to carbonaceous-siliceous-argillaceous rock-hosted uranium deposits, but they have thermself unique characteristics. The rock-hosted is composed of marine hydrothermal sedimentary rock(that is CSA series rock ) formed rift fracture zone. The forming process of those type gold deposits is related to the postsedimentary process. With the research and analysis of the metallogenic geological conditions of GSA-type gold dcposits, three forming stages can be divided(1) initial enrichment stage of gold in the source bed,(2) hydrothermal transformation enrichment stage, and(3) supergene oxidized transformation enrichment stage.