甘肃丁家梁金矿床富集规律与成矿机理研究

Enrichment Regularity and Ore-forming Mechanism for the Dingjialiang Au Deposit in Gansu

甘肃丁家梁金矿主要为微细浸染型和石英脉型金矿床,产于志留系的变质碎屑岩中,矿化受160°～340°方位主应力挤压形成的复式背斜构造所控制,矿体赋存于复式背斜核部及其北翼的蚀变破碎带中,围岩蚀变具明显的分带性。矿床成矿作用受地层岩性、次级构造及印支期岩浆活动诸因数控制,适宜的容矿环境和适当的温压条件是金成矿的关键因素。

The Dingjialiang Au deposit is a fine disseminated and quartz vein type one.The mineralization is confined to the Silurian metamorphic detrital rock and controlled by composite anticline which was formed by pressure stress with orientation of 160°-340°.The orebodies occur in the core of the composite anticline and altered fracture zone in its northern limb.The wallrock alteration is characterized by zonation.The ore-formation is controlled by lithologic character,secondary structure and magmatism.