甘肃北金山金矿地质特征及成因

北金山金矿区位于文县—康县金矿带内,属阳山矿带7个矿段之一。目前该矿区已发现3条矿化蚀变破碎带,均产于中泥盆统三河口组第二岩性段蚀变千枚岩中。断裂是北金山金矿区成矿最主要的控制因素。该区虽未见岩浆岩出露,但构造滑动时产生的热液和邻近的阳山超大型金矿岩浆活动产生的热卤水使金的溶解度增高,促使金和其他元素活化迁移,在有利的构造部位成矿。该矿床具有黄铁矿化、硅化、绢云母化及碳酸盐化等中低温热液蚀变组合,初步认为该矿床为热液破碎蚀变岩型金矿床。

Geological Features and Genesis of Beijinshan Gold Deposit, Gansu Province

Located in the Wen county-Kang county metallogenic belt,Beijinshan gold deposit is one of the Yangshan belt＇s seven ore blocks.Recently,three fracture zones were found in the gold deposit alteration what were produced in the altered phyllite of Sanhekou group the second lithologic in the Devonian system.The fracture structure is the main ore-controlling factor for Beijinshan gold deposit.Although there is no magmatic rock＇s exposing,the hydrothermal made by the fracture structure＇s sliding and the hot brine produced by the magmatic activity of the adjacent Yangshan large gold deposit increase the solubility of gold.It made gold and other elements activated so that they moved to be the mineralization in the suitable tectonic position.This deposit is pyritization,silification,sericitization,carbonation and some other medium/low temperature hydrothermal alteration assemblage.It seems that this deposit is a hydrothermal broken altered rock gold deposit.