西藏错那县西午铅锌矿床地质特征及找矿方向

Geological characteristics and prospecting direction of Pb-Zn deposit in Xiwu,Cuona County,Tibet

西藏错那县西午铅锌矿床位于藏南地区,处于特提斯-喜马拉雅构造成矿带东缘。通过对矿床地质背景、地质特征、成矿机理和找矿方向的研究,认为成矿地质条件较好。经野外调查、钻探和样品测试分析,认为西午铅锌矿床主要受控于SN向断裂,通过构造解析认为矿区NE向断裂带及其次级裂隙既控制了中基性岩脉的侵入活动,同时又是主要的控矿、导矿和容矿构造。通过矿床成因研究,初步推断该矿床是与构造-岩浆侵入活动有关的中低温热液充填交代型矿床。加大对矿体深部的勘探力度,同时对F1、F2、F4所围限的三角形区域进行重点研究和勘查,有望扩大矿床规模。

The Xiwu lead-zinc deposit in Cona County,Tibet is located in southern Tibet,on the eastern margin of the Tethys-Himalayan tectonic metallogenic belt. Through the study of the geological background,geological characteristics,metallogenic mechanism and prospecting direction of the deposit,it is believed that the deposit’s metallogenic geological conditions are good. After field investigation,drilling,and sample test analysis,it is believed that the Xiwu lead-zinc deposit is mainly controlled by SN-trending faults. Through structural analysis,it is believed that the NE-trending fault zone and its secondary fissures in the mining area have both controlled the intrusive activities of the basic rock veins. It is also the main ore-controlling,ore-guiding structure and ore-hosting structure. Through research on the genesis of the deposit,it is preliminarily inferred that the deposit is a metasomatic deposit of midlow temperature hydrothermal fluid filling related to tectonic-magmatic intrusion. Intensify the exploration of the deep part of the ore body,and at the same time,carry out key research and exploration on the triangular area enclosed by F1,F2,and F4,which is expected to expand the scale of the ore body.