阿西金矿床流体成矿的地球化学示踪研究  

STUDIES ABOUT GEOCHEMICAL TRACING ON FLUID ORE FORMING IN A'XI GOLD DEPOSIT

作　　者：滕彦国[1] 倪师军[1] 张成江[1] 曹志敏 罗梅[1] 

机构地区：[1]成都理工学院核工系

出　　处：《贵金属地质》1999年第2期104-109,共6页

基　　金：国家计委科技找矿项目;国土资源部百名跨世纪优秀人才培养计划基金;国家"九五"科技攻关重点项目

摘　　要：依据阿西金矿床Ｈ、Ｏ同位素组成特点对成矿流体的来源进行了示踪研究，并且研究了矿床的水岩交换作用，讨论了水－岩作用与金成矿的关系．根据矿床中典型热液矿物和岩矿石的稀土元素地球化学特征对成矿流体作用过程进行了示踪研究，与同位素地球化学示踪研究取得了基本一致的结果．根据成矿流体活动踪迹建立找矿标志，是进行矿产资源预测的新思路．Fluid geochemistry is a frontier of research in international earth science field,and tracing on information of fluid movement is another focus of research at present In past time,isotopic method and REE geochemical method were used to study source of mineralizing material and mechanism of ore forming,but were not so fully and widely used in tracing tracks of ore forming fluid So,in this essay,the emphasis of research is on the tracing of ore forming fluid movement The isotopic features of A'xi gold deposit from quartz fluid inclusion are δ D:-54 7‰～-117 7‰(average,-94 9‰); δ 18 O H 2O :-8 6‰～+5 8‰(average,-0 48‰) The relationship between δ D and δ 18 O H 2O shows that ore forming water originates mainly from meteoric groundwater,partly from magmatic water and metamorphic water REE geochemical characteristics of minerals and rocks indicate that mineralizing material mainly comes from sedimentary rocks Isotopic exchange and water rock interaction researches can check fluid active traces,that is,ore body is the center of fluid movement,on both sides of which fluid movement become weaker and weaker In A'xi gold deposit,the δ 18 O of ore body are greater,while the other rocks' are lower Water/rock ratio of ore body is high,those in both sides of the ore body are small(ratios are respectively 0 56-0 31-0 19 and 0 56-0 22-0 01,the former presents ore body skarn quartz diorite,and the later presents ore body marble middle Triassic system). In summery,REE and δ 18 O can be used to refer to some features of mineralizing fluid activities Using these features,we can set up some tracing marks to search and prospect mineral resources,and to trace fluid paths

关 键 词：流体成矿 同位素 地球化学示踪 金矿床 

分 类 号：P618.510.5[天文地球—矿床学] P618.510.4[天文地球—地质学]