北秦岭金银多金属成矿带天水段成矿地质特征及找矿思路

北秦岭金银多金属成矿带天水段地处秦岭造山带反"S"型转折部位内弧北侧,区内构造岩浆活动频繁,溶浆分异相对彻底,矿质浓度较高,矿石类型显示出以块状硫化物为主的特征。结合李子园金矿的基本地质特征,初步分析认为该区金银多金属矿床成矿严格受区内东西向复式背斜控制,矿脉主要富集于次级褶皱发育的地段及层间剥离断裂构造旁侧,由于区内应力作用方式属以近似水平滑移作用为主的运动形式,诸多矿脉皆显示出延深大、延长小的特点。本文根据北秦岭金银多金属成矿带天水段的成矿地质特征及成矿规律进一步提出了该区今后的找矿思路。

Geological Characters and Prospecting Thread on Tianshui Section of North Qinling Mountains Au-Ag-Multimetals Metallogenetic Ore Zone

The gold mine of the Tianshui section in the north Qinling Mountain is located in the north side of the inner arc of reversed S-shaped turning point in the Qinling orogenic belt. The deposits are strictly controlled by the east-west multiple anticlines, and the ore veins are mainly enriched in the sections where the secondary folds are well developed and in the latend side of interlayer stripping fatdted structures. As the stress action in the region is mainly by the way of near-horizontal slip, many ore veins are characterized with large depth extension but short elongation. The tectonic and magmatic activities in the region are continual and frequent , the magmatic differentiation being comparatively complete and the ore solution concentration being higher. The ore appears mainly in the type of massive sulfides, gold grade being relatively high.