拉尔玛硅岩型金—铜—铀建造矿床的海底喷流沉积特征及找矿方向

EXHALATIVE-SEDIMENTARY FEATURES AND PROSPECTING TARGETS OF LAERMA GOLD-COPPER-URANIUM DEPOSIT

西秦岭南亚带中的拉尔玛硅岩型金-铜-铀矿床,是一个比较典型的与海底喷流作用有关的金矿床。矿床赋存于寒武系太阳顶群中。太阳顶群地层由硅岩、板岩组成,厚度近千米。现已发现的矿体,80％以上产于硅岩中。硅质岩的地质地球化学特征表明,它是海底喷气沉积作用的产物,拉尔玛金-铜-铀建造矿床也具有海底喷流的沉积特征。

Laerma silicalite type Au-Cu-U deposit in the south subzone of the western Qinling is a more typical gold deposit which is related to submarine exhalative sedimentation. The deposit occurs in the Cambrian Taiyangding Group which is composed of silicalite and slate with a thickness of about 1,000m. More than 80% of the orebodies are confined to the silicalite. Geologic-geochemical features of the silicalite indicate that it is a product of submarine exhalative sedimentation which was responsible for the formation of the deposit.