福建何宝山金矿成因探讨

On the Genesis of Hebaoshan Gold Ores in Fujian Province

福建何宝山金矿的成矿地质条件在崇安—石城构造带,特别是中、南段金矿中具有广泛的代表性。本文从矿区宏观地质特征入手,结合成矿元素构造地球化学研究、氢氧硫同位素特征以及K-Ar年龄证据等。认为何宝山矿区金矿化主要经历了加里东期断裂变质-混合岩化作用和(印支晚期)—燕山早期构造动力作用两次叠加、富集成矿过程,前者是金富集成矿的“基础”,后者是形成具一定工业意义金矿体的“关键”。

The Hebaoshan Gold Ores is situated at the intersection point of the Chongan-Shicheng Structural Belt and Jianing-Jianou Structural Belt in Fujian Province. Based on the geological characteristics of the mining area, geochemical features of ore-forming elements, characteristics of hydrogen-oxygen-sulphur isotopic elements and the geological ages, it is inferred that the Hehaoshan Gold Ores underwent the superposition and enrichment mineralization of the faulted metamorphism-migrnatization in the Caledonian period and the tectonic dynamic metamorphism in the Late Indosinian-Yanshanian period, the first of which is the 'founda tion' of gold enrichment and ore-formation and the latter of which is th 'key' of forming a gold orebody with a pay grade.