西藏南部马扎拉金锑矿成矿特征及找矿方向

Metallogenic characters and prospecting direction of the Mazhala gold-antimony deposit,sourthern Tibet

马扎拉金锑矿由 5个矿群组成 ,在空间上呈反“Z”形分布。其中Ⅰ、Ⅲ、Ⅴ、Ⅷ矿群成矿较好。矿区下侏罗统日当组第一岩性段为主要控矿层位 ,该组地层平均Au丰度值为 0 17×10 - 6,为区内金矿的主要矿源层 ;普遍发育的岩浆岩为马扎拉金锑矿的形成提供了部分物源和热动力 ;而复杂的构造为矿液的运移、聚集成矿提供了良好的场所。钻孔资料显示 ,在Ⅴ、Ⅷ矿群近地表及深部具有一定的找矿前景 ,而在Ⅲ矿群则应侧重于近地表找矿。在砂金找矿方面 ,除应进一步对龙德普下游进行找矿工作外 。

The Mazhala gold antimony deposit consists of 5 ore body groups which arraged in'Z'shap in spatial, and the Ⅰ,Ⅲ,Ⅴ,Ⅷ ore body groups is the main ore body. The major ore control stratum, first lithohorizon of Ridang group of lower Jurassic series, which has the high gold content(0 17×10 6 ), is the main mineral origin of gold deposit. However,the magma rocks supplied source of mineral matter and hot power to form the deposit;the complex structure supplied good places for the moving and assembling of ore solution.The drillers log shows that there was good prospect on surface or in deep situation in Ⅴ,Ⅷ mineral groups,but in Ⅲ groups the prospecting should be mainly focused on the surface.The further prospecting should be not only took on the lower reaches of Longdepu,but also on the middle lower reaches of Pengdepu.