老挝色贡省格棱铁矿地质特征及找矿标志  

Geological Featuers and Prospecting Criteria of Gelin Iron Deposit in Segong of Laos

作　　者：朱华平[1] 范文玉[1] 罗茂金[1] 

机构地区：[1]成都地质矿产研究所,成都610082

出　　处：《桂林理工大学学报》2012年第4期469-474,共6页Journal of Guilin University of Technology

基　　金：中国地质调查局国土资源大调查项目(1212011220907)

摘　　要：格棱铁矿床位于老挝长山成矿带内,铁矿体产于下—中三叠统碎屑岩夹碳酸盐岩建造中,严格受北东向断裂构造控制。矿体呈脉状、透镜状分布;矿石构造以细脉状、角砾状及团块状为主;矿石类型简单,主要为镜铁矿,夹少量磁铁矿;3个矿体的平均品位(TFe)在50%左右。初步认为该矿床与长山成矿带内花岗闪长岩体有关,岩体提供热源及矿源,属于岩浆期后热液脉型镜铁矿床。找矿标志以花岗闪长岩体侵位、围岩强烈的硅化、绿泥石化及航磁异常为主。Gelin iron deposit locates at Changsan metallogenic belt in Laos.Iron ore bodies lie in clastic and carbonate sedimentary rock in low-middle Triassic,strictly controlled by northeast fault structure.The orebodies distribute in lens and nervation shape,and the structure of ores are mainly fine vein,brecciated and crumb.The type of ores is very simple,includimg specularite and a small amount of magnetite.The average grade（TFe） of three orebodies is about 50% in Gelin deposit.Based on these information,it is concluded that the iorn deposit belongs to hydrothermal vein type connected with later stage magmatic activity.Iron ore deposits are associated with granodiorite rock between Changshan metallogenic belts.The granodiorite rock provides heat and metallogenic material.The ore-prospecting indicator primarily includes granodiorite emplaceing,strong silicification,chloritization in wall rock and magnetic anomaly.

关 键 词：镜铁矿 地质特征 找矿标志 格棱铁矿 老挝 

分 类 号：P618.31[天文地球—矿床学]