摘要
河北营房银矿床产于花岗岩破碎带中,含矿岩石为浆爆角砾岩。矿质来源于深部含矿熔浆,熔浆既呈角砾又呈胶结物出现,其量越多矿化越好。银的富集主要与黄铁矿、方铅矿、闪锌矿关系密切。本区有益元素除银外,尚伴生一定量的金、铅、锌等。成矿元素具有上部为银(金、铅、锌)下部为铅锌(银、金)的垂直分带特点。矿床的围岩蚀变主要为硅化、水云母化、铁白云石化及蒙脱石化。根据含矿岩石及蚀变围岩特征、矿石结构构造、有益元素赋存状态、硫、氧同位素等资料综合分析,矿床成因为含矿英安质熔浆经隐爆作用形成的浅成中一低温热液改造型银矿床。
Silver deposit from Ying Fang in He Bei occurs in granite fracture belts. Ore-forming materialsare derived from ore-bearing magma at depth. Mineralization is more developed as melted magma in-cease. Enrichment of silver is mainly associated with pyrite, galena and sphalerite. This area also con-tains Au. Pb. Zn besides silver. Ore-forming elements are characterized by the vertical zoning of Agat upper part, Pb Zn at lower part. Alterations of wall rocks in the deposit are mainly silicification, hy-dromicazation, ferri-dolomitization and smectition. On the basis of comprehensive analysis about fea-tures of ore-forming rocks and alterred country roocks, texture and structure of ore, occurrence of use-ful elements and δ^(34)S、δ^(18)O data, we suggest that the depposit is epigene middle-lower temperature hy-drothermal reworked silver deposit formed by the hidden explosive effect of quartz-andesite ore-dearing melted magma.
出处
《地质找矿论丛》
CAS
CSCD
1991年第4期80-89,共10页
Contributions to Geology and Mineral Resources Research
