甘肃省民乐县小石壁沟金矿地质特征及成因初探

小石壁沟金矿位于祁连山地槽褶皱带的中段,走廊南山复向斜带的南坡复背斜中。矿化带主要赋存于下志留统中部绿色碎屑岩组地层中,赋矿岩石为粉砂岩和砂质板岩。矿体受断裂破碎带控制明显,产状与破碎带产状一致,矿体多呈似层状、透镜状,矿石矿物成分简单,矿石多为条带状、浸染状构造等特点,因此小石壁沟金矿属微细粒破碎蚀变岩型。

Geological Features and Genetic Research of Xiaoshibigou Gold Mine in Mingle County, Gansu Province

Xiaoshibigou gold ming is situated in the south slope anticline of south corridor Synelinorium belt, in the middle of the slot fold belt of the Qilian Mountains. Mineralization belt mainly occurs in the stratum of central green clastie rock group in the Lower Silurian Series, hosted in silt stone and sandy slate. The ore body was obviously controlled by and formed in consistent with the fractured zones, maily in stratiform or lenticular form . The mineral composition is simple, with banded structure and disseminated features, so the Xiaoshibigou gold mine belongs to the miemgranular broken altered rock type.