甘肃省西和县银子崖铅锌矿地质特征及找矿标志浅析

Analysis of geological characteristics and prospecting criteria of Yinziya lead-zinc deposit in Xihe County,Gansu Province

银子崖铅锌矿隶属于西成铅锌矿田,是秦岭铁~铅锌(铜)多金属成矿带的西延部分,该矿带具有分布面积大,赋存层位稳定,既有陆源沉积矿床特征又有热液矿床特征。矿体主要受地层、构造、岩相、岩性控制。铅锌矿主要赋存在中泥盆系西汉水群黄家沟组,主矿体受银子崖至邓家山背斜构造的灰岩(脆性)与千枚岩(塑性)的虚脱剥离空间及倒转翼的逆断层控制,赋存在岩相过渡带和碳酸盐岩中。矿体赋存在碎屑岩与碳酸岩的岩相过渡带和碳酸盐岩一侧。近东西向断裂构造中充填有石英脉、方解石脉并见有铁矿化、方铅矿化、闪锌矿化及绢云母化、绿泥石化、硅化、高岭土化等蚀变均为重要的找矿标志。

The Yinziya lead-zinc deposit belongs to the Xicheng lead-zinc ore field and is the western extension of the Qinling iron lead zinc(copper)polymetallic mineralization belt.The ore belt has a large distribution area,stable occurrence layers,and features both terrestrial sedimentary deposits and hydrothermal deposits.The ore body is mainly controlled by stratum,structure,lithofacies and lithology.Lead zinc deposits are mainly hosted in the Huangjiagou Formation of the Western Han Water Group of the Middle Devonian.The main ore body is controlled by the detachment space of limestone(brittle)and phyllite(plastic)in the Yinziya to Dengjiashan anticline structure,as well as the reverse fault of the inverted wing,and is hosted in the transitional zone of lithofacies and carbonate rocks.The ore body is located in the lithofacies transition zone between clastic rock and carbonate rock and on the side of carbonate rock.Quartz vein,calcite vein and iron mineralization,galena mineralization,zinc blende mineralization and sericite,chloritization,silicification,kaolinization and other alterations are important prospecting indicators in nearly EW trending fault structures.