甘肃礼县金山金矿床矿石组构及成因类型的研究

Study on ore fabric and genetic types of Jinshan gold deposit in Lixian County, Gansu Province

金山金矿矿石组构的系统研究主要依据野外钻孔编录工作和室内镜下系统鉴定。矿床的矿石构造相对简单,主要有浸染状、斑点状及脉状构造。矿石结构较为复杂,以结晶作用形成的结构和交代结构为主,其次为压力作用形成的结构、固溶体分离结构和沉积作用形成的结构。结合前人研究成果,作者划分出四个成矿期次:沉积成岩期、变质富集期、热液成矿期和表生期。最终,作初步确定该矿床为构造-岩浆活动控制的中低温热液交代型金矿床。

The systematic study of ore fabric in Jinshan gold mine is mainly based on field borehole logging and indoor microscopic systematic identification.The ore structure of the deposit is relatively simple,mainly including disseminated,spotted and vein structures.The ore structure is relatively complex,mainly formed by crystallization and metasomatism,followed by pressure,solid solution separation and sedimentation.Combined with the previous research results,the author can be divided into four metallogenic stages:sedimentary diagenesis,metamorphic enrichment,hydrothermal mineralization and supergene.Finally,it is preliminarily determined that the deposit is a medium low temperature hydrothermal metasomatic gold deposit controlled by tectonic magmatic activity.