甘肃李坝金矿床成矿地质特征  

Mineralizing Geological Features of Liba Gold Deposit in Gansu

作　　者：罗天伟[1] 周继强[1] 

机构地区：[1]甘肃有色地质勘查局四队,甘肃张掖734012

出　　处：《桂林工学院学报》2004年第4期407-411,共5页Journal of Guilin University of Technology

基　　金：国家科技攻关项目(96-914-01-04);国家重点基础研究项目(G1999043213)

摘　　要：从区域地质背景、区域和区内成矿地质条件(构造、地层、岩性、岩浆、变质、金的赋存状态等方面)阐明了李坝矿床地质特征、成矿规律、找矿标志及找矿方向,总结出了异常+构造+岩脉+蚀变四位一体的综合找矿标志.深大断裂的旁侧次一级断裂构造是主要的控矿构造(容矿构造),并决定着矿体的大小、形态和产状;矿区内岩体、岩脉的出露与成矿关系较为密切,泥盆系碎屑岩是含矿的主要岩石;特定的异常元素组合(Au-Ag-As-Sb-Pb-Zn)指示金矿体的存在,化探是找矿的最有效手段.The geological features,minerogenetic patterns,mineralizing criteria and exploration targets of Liba gold deposit are presented based on regional geological settings and mineralizing geological conditions which include structures,strata,lithology,magmatism,metamorphism and gold occurrence.A general prospecting criterion is proposed,which is composed of anomaly,structure,magmatic vein and alteration.The secondary faults of deep-seated fracfures are the major ore-control or ore-host structures which control size,shape and occurrence of ore boldies.Magmatism and magmatic reins are closely related to gold mineralization,which is mainly hosted in Deronian clastic sedimentary rocks.A specific geochemical anomaly pattern (Au-Ag-As-Sb-Pb-Zn)indicates the existence of gold ore body.Geochemical prospecting is the most effective method at Liba gold deposit.

关 键 词：甘肃李坝 金矿床 成矿地质特征 岩脉 成矿关系 金矿体 容矿构造 矿区 赋存状态 产状 

分 类 号：P618[天文地球—矿床学] P631.3[天文地球—地质学]