青海果洛龙洼金矿床成因探讨及成矿模式构建

摘要

The east Kunlun structural belt which is called“Gold belt” is one of the famous mineralization belts in China.Guoluolongwa is a large gold deposit located in the east end of east Kunlun and it is controlled by fractures. Even many prospecting work have been done,the genesis of the deposit is still unclear,that block the prospecting work.The ore bodies occur in the phyllonite and the ore belongs to quartz-vein type.Given the regional geological evolution,ore geology and the isotopes character,we conclude that the gold deposit is a magmatic mesothermal quartz-vein type deposit which formed during the orogeny.It will make a reference to the prospecting work of the deposit and similar deposits in the east Kunlun.%东昆仑构造带是我国著名的成矿带之一，素有“金腰带”之称，是我国重要的矿产资源基地。果洛龙洼金矿床是东昆仑东段一个典型的大型金矿床，虽然该矿床前期已经投入较多的找矿勘查工作，但是矿床成因研究不足，严重制约了该区找矿工作的突破。本文在研究区域地质演化背景和矿床地质特征的基础上，认为该矿床主要受断裂控制，矿体产于纳赤台群千糜岩中，矿石类型以石英脉型为主。利用 S、Pb、H-O 同位素示踪手段确定该矿床为形成于造山过程中的岩浆热液石英脉型金矿床。矿床成因类型的确定为该矿床下一步找矿工作提供了方向，同时也为整个东昆仑地区同类型金矿找矿工作提供借鉴。