贵州省盘县架底金矿火山角砾岩微量元素地球化学特征及其与成矿的关系  

Geochemical characteristics of trace elements of volcanic breccia in Jiadi gold deposit of Panxian,Guizhou Province and its relation to mineralization

作　　者：张兵强 杨清毫 赵富远 王石华[1] 刘松[1] 李俊海[1] ZHANG Bing-qiang;YANG Qing-hao;ZHAO Fu-yuan;WANG Shi-hua;LIU Song;LI Jun-hai(No.105 Geological Team,Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550018,China)

机构地区：[1]贵州省地质矿产勘查开发局一0五地质大队,贵阳550018

出　　处：《世界地质》2020年第4期755-767,共13页World Geology

基　　金：贵州省地质矿产勘查开发局青年地质科研基金项目[黔地矿科合(2018)37号];贵州省科技计划项目[黔科合平台(2018)5765号]资助。

摘　　要：贵州省盘县架底金矿是近年来在峨眉山玄武岩地层中发现的大型原生金矿床,矿区整套玄武岩地层中存在上下两层火山角砾岩,两层火山角砾岩在结构、构造和角砾特征等方面无明显不同,但其容矿性却存在着截然的差异。下层火山角砾岩是矿区最主要的容矿岩石,上层火山角砾岩主体基本无蚀变,不含矿。两层火山角砾岩含矿性的差异,除了受构造、热液蚀变等影响外,可能还跟其岩性差异有关。通过对比,两层火山角砾岩ΣREE和Zr、Ti、Nb等惰性元素含量存在明显差异,分析认为两层火山角砾岩经历了不同的岩浆结晶分异作用,下层火山角砾岩分异演化程度更高,其岩性属中基性甚至中性,两层火山角砾岩岩性的不同应该是导致其容矿性差异的一个重要原因。The Jiadi gold deposit is a large primary gold deposit discovered in recent years in Mount Emei basalt formation located in Panxian,Guizhou Province.There are two layers of volcanic breccia in the basaltic formations of the mining area,with no obvious differences in the structure and breccia characteristics,but with quite different ore-bearing properties.The lower volcanic breccia is the main ore-bearing rock in the mining area,whereas the upper volcanic breccia shows no alteration and ores.The difference of ore-bearing property of two layers of volcanic breccia may be related to their lithology,in addition to the influence of structure and hydrothermal alteration.The contents of REE and inert elements such as Zr,Ti,Nb in the two layers of volcanic breccia are obviously different.It is indicated from the analysis that two layers of volcanic breccia experienced different crystallization and magma differentiation,of which the lower volcanic breccia has a higher differentiation,and its lithology is intermediate-basic to intermediate.The difference of lithology between the two layers of volcanic breccia should be a key reason for the difference in ore-bearing.

关 键 词：火山角砾岩 微量元素 成矿 架底金矿床 盘县 

分 类 号：P595[天文地球—地球化学] P618.51[天文地球—地质学]