甘肃省瓜州县马莲井西地区金矿地质特征

Geological Characteristics of Gold Deposit in the West Area of Malian Jingxi County,Guazhou County,Gansu Province

勘查区位于大地构造属天山褶皱系北山褶皱南带,马莲井-公婆泉复向斜南翼。勘查区地层主要为二迭系下统哲斯群(P_1zh_2)、第三系(N_1k)和第四系(Q)。二迭系地层的岩性主要为粗粒-细粒长石砂岩夹砾岩,粉砂岩及粉砂质页岩、灰岩等。第三系为一套陆相红色碎屑岩,主要为泥质砂岩、粉砂岩和砾岩。第四系主要为冲、洪积砂砾、砂质黏土及泥土。根据矿化体严格受构造破碎带控制、产状与破碎带产状一致,矿体呈似层状、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,属石英脉+蚀变岩型金矿化。

The exploration area is located in the area of the Tianshan mountain, which is the southern belt of the north mountain, which is the northern mountain, and the ma liangjing-the shiva spring complex to the south wing.The formation of the exploration area mainly includes the two groups of the second-line group （Plzh2）, the tertiary （Nlk） and the fourth se- ries （Q）.The lithology of the strata is mainly coarse grain-fine grained feldspar sandstone, sihstone and silty shale, lime- stone, etc.The tertiary system is a set of continental red clastie rocks, mainly of argillaceous sandstone, siltstone and con- glomerate.The fourth major is charge, flood sand gravel, sandy clay and soil. According to strict mineralized bodies con- trolled by tectonic fracture zone, occurrence in accordance with fracture zone occurrence, ore bodies in bedded and lenticu- lar, ore mineral composition is simple, the ore is a more ribbon, disseminated structure etc., belongs to quartz vein and al- tered rock type gold mineralization.