陕西小秦岭金矿田太峪金矿区Q154号矿脉构造-蚀变特征及深部找矿预测  

Tectonic-alteration characteristics and deep prospecting prediction of Q154 vein in Taiyuvillage,Xiaoqinling gold field,Shaanxi Province

作　　者：文月贵 张欢欢 刘涛 WEN Yuegui;ZHANG Huanhuan;LIU Tao(Shaanxi Geology and Mining Sixth Geological Team Co.LTD,Xi'an 710611,Shaanxi,China)

机构地区：[1]陕西地矿第六地质队有限公司,陕西西安710611

出　　处：《矿产勘查》2023年第6期861-871,共11页Mineral Exploration

基　　金：中国地质调查局项目“陕西小秦岭金矿田深部及外围金矿整装勘查区找矿预测与技术应用示范(12120114014101)”联合资助。

摘　　要：小秦岭金矿床是豫陕小秦岭贵金属成矿带的重要组成部分,为韧性剪切带控制下的热液脉型金矿床,为探讨其深部成矿潜力,本文结合矿区地质背景、矿床成因、矿体特征对陕西小秦岭金矿田Q154号矿脉进行找矿预测研究。研究表明Q154号矿脉经过两期构造活动叠加成矿,主体呈左行逆冲断层。矿脉早期(成矿期)受北东向的挤压力,根据断层面顶板擦痕判断为一逆冲断层,力学性质为压扭性,晚期叠加左行走滑断层;根据构造控矿规律研究认为矿体向西侧伏。与金矿化密切相关的蚀变矿物组合为黄铁矿化-硅化-绢云母化。根据控矿构造空间及蚀变矿物组合特征,初步认为Q154号矿脉西段玉石峪西坡—太峪东坡700~500 m标高段可能为一矿化富集地段,可供工程进一步验证。Xiaoqinling gold deposit is an important part of Xiaoqinling precious metal metallogenic belt in Henan and Shaanxi Province.It is a hydrothermal vein gold deposit controlled by ductile shear zone.In order to explore its deep metallogenic potential,this paper studies the prospecting and prediction of Q154 vein in Xiaoqinling gold field in Shaanxi Province based on the geological background,deposit genesis and orebody characteristics.The study shows that the main body of Q154 vein is a left-running thrust fault after two phases of tectonic activity superimposed mineralization.In the early stage(metallogenic stage),the veins were subjected to the NE-trending extrusion pressure,and were judged to be a thrust fault with compression-torsion mechanical properties according to the scratches on the top plate of the fault plane,while the late stage was a left-strike-slip fault.According to the study of structural ore control law,it is believed that the ore body lies to the west.The altered mineral assemblage closely related to gold mineralization is pyritization,silicitization and sericitization.According to the ore-controlling structural space and the characteristics of altered mineral association,the 700-500 m elevation section of Yushiyu West slope and Taiyu East slope in the western section of Q154 ore vein may be a mineralization enrichment section,which can be further verified by engineering.

关 键 词：小秦岭 构造控矿 围岩蚀变 找矿预测 陕西 

分 类 号：P612[天文地球—矿床学]