摘要
甘肃岷县耳阳沟铅锌矿处于西成矿田西延地段,茶埠—沟脑里帚状构造撒开部位,铅锌矿体主要分布在耳阳沟背斜北东翼的中泥盆统榆树坪组地层中,主要岩性为硅化灰岩、板岩、钙质粉砂岩,矿体的顶底板围岩均为泥灰岩,矿体与围岩界限比较明显。矿床平均品位Pb+Zn为5.13%;伴生组分Ag、Cd等。文章通过探讨该矿床地质特征,从地质、化探等方面分析成矿条件,认为泥盆系是本区的矿源层;矿体赋存于NW向断裂蚀变带中,断裂为导矿、容矿构造,区内化探异常均与已知矿体相对应,是地质找矿的重要标志。区内围岩蚀变发育,也是重要的找矿标志。
Eryangou Pb-Zn deposit is situated at westwards extension of Xihe-Chenxian Pb-Zn ore field. Pb-Zn ore body occurred in Devonian Yushuping Formation which is composed of silicificated limestone, slate, calcareous siltstone, with an apparently boundary to the roof wall rock of marlstone. The average total Pb and Zn grade of deposit is 5.13% , and accompanying with Ag and Cd. The paper discussed geological setting and metallogenesis in view of geological and geochemical data. It is concluded that Devonian System is the source bed occurred fault alteration zone of NW direction, ore fluid transmitted through and deposited in the faults where outlined geochemical anomalies in this area.
出处
《甘肃地质》
2013年第4期58-62,共5页
Gansu Geology
关键词
铅锌矿
地质特征
找矿标志
甘肃
lead-zinc deposit
geological characteristics
prospecting, Gansu
