湘西五强溪金矿稀土-微量元素地球化学特征及其成因指示  

Rare Earth-trace Element Geochemistry and Genesis Directions of Wuqiangxi Gold Mineralization Concentrated Area in Western Hunan Province

作　　者：贾三石[1] 付建飞[2] 王恩德[2] 冷文芳 

机构地区：[1]东北大学秦皇岛分校资源与材料学院,河北秦皇岛066004 [2]东北大学资源与土木工程学院,辽宁沈阳110819 [3]辽宁省矿产勘查院,辽宁沈阳110032

出　　处：《稀土》2017年第4期95-104,共10页Chinese Rare Earths

基　　金：中央高校基本科研业务费专项资金(N130423003)

摘　　要：针对湘西五强溪金矿化集中区的金矿床成因问题,通过对其赋矿紫红色砂质板岩、发生褪色蚀变的砂质板岩、钠长岩脉、含金钠长石英脉和含金多金属硫化物石英脉的稀土-微量元素地球化学研究发现,稀土配分模式均为右倾重稀土富集型,微量元素反映壳源特征,但具体的分布模式和范围表明,钠长岩脉所代表的岩浆活动与区内金成矿关系密切,而紫红色砂质板岩的褪色蚀变则表明了成矿流体的还原性特征,结合区域地质和矿床地质研究成果,本区金矿床为与印支-燕山期构造岩浆活动产生的还原性成矿流体有关的金矿床。To reveal the genesis of the gold deposit of Wuqiangxi gold mineralization concentrated area in western Hunan province, this paper studied the rare earth-trace element geochemistry character of the ore-bearing rock of purple sandy slate, fade alterated sandy slate, albitite dikes, gold-bearing albitite quartz veins and gold-hearing quartz vein with polymetallic sul- phides. The results showed that REE assemblage was rightist HREE enrichment. Trace elements reflected crust source charac- teristics. The specific distribution pattern and scope of the albitite dikes showed that gold mineralization was closely related to the magmatism. And the faded purple alteration of sandy slate indicated reducing features of the ore-forming fluid. Combined with the regional geology and ore deposit geology research, the gold deposit in this area was related to the reduced ore-forming fluids produced by the Indo - Yanshanian magmatic activities.

关 键 词：湘西 五强溪 稀土元素 微量元素 金矿 

分 类 号：P595[天文地球—地球化学]