甘肃省肃南县老君庙蛇纹石玉矿床地质特征及矿床成因

Geological Characteristics and Genesis of the Serpentine Jade Deposit in Laojunmiao, Sunan County, Gansu Province

老君庙蛇纹石玉矿位于甘肃省肃南县,矿体赋存于下元古界下岩组的蛇纹石化大理岩中。蛇纹石玉石矿物组成主要为蛇纹石,其次为透闪石、透辉石、方解石等,玉石呈黄绿—墨绿色,致密块状,质地细腻温润,蜡状光泽,稍透明—半透明,硬度3.5~4.5。该矿床由富镁碳酸盐经岩浆热液对交代变质形成,属热液交代蚀变型矿床。

The serpentine jade of Laojunmiao is located in Sunan county, Gansu province, and the ore body is deposited in the serpentine marble of lower rock group of Early Proterozoic. The main mineral components of serpentine jade is serpentine with a small amount of remolite, diopside and calcite. The jade is yellow green to dark green, compact massive, delicate texture, waxy luster,transparent to translucent, and with the hardness of 3.5~4.5. The ore deposit is formed by magnesium-rich carbonate after the metasomatism by magmatic hydrothermal fluid, which is belonged to hydrothermal alteration deposit.