湖南麻阳砂岩自然铜矿床元素地球化学及其成因意义  被引量:3

Element Geochemistry and Its Genetic Significance of Native Copper Mineralization in the Mayang Deposit,Hunan Province,China

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作  者:王大鹏[1] 张乾[1] 郭国林[2] 蔡伊[1,3] 

机构地区:[1]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳550002 [2]东华理工大学核资源与环境教育部重点实验室,南昌330013 [3]中国科学院研究生院,北京100039

出  处:《吉林大学学报(地球科学版)》2014年第4期1177-1187,共11页Journal of Jilin University:Earth Science Edition

基  金:国家自然科学基金青年基金项目(41102054);核资源与环境教育部重点实验室开放基金项目(060604)

摘  要:麻阳铜矿床(又称九曲湾铜矿床)位于湖南省沅麻盆地中段南部,其南部靠近雪峰山,开采历史悠久,是一类十分罕见的产于砂岩中的自然铜矿床。含矿岩系主要为上白垩统锦江组,矿体呈层状或似层状产出,少数为短距离内尖灭的透镜体,严格受灰白—灰绿色砂岩控制;矿化主要以胶结物产出,自然铜占总资源量的90%左右。测试了麻阳铜矿不同工作面的红色粉砂岩、自然铜砂岩(矿石)、辉铜矿砂岩(矿石)及自然铜、辉铜矿的常量元素和微量元素含量,应用Spearman秩相关分析对数据进行统计分析。结合矿物组合特点认为,与Cu有较强正相关的Fe、Ag、As、Ba、Sr等元素对矿化形成条件有指示意义。铜矿化的形成与成岩期热液活动有着密切联系,流体可能来源于低温、弱还原的地下水。The Mayang copper deposit located in the Central of Yuanma basin and near to Mount Xuefeng in the southern is a rarely sandstone type native copper deposit.The production of this deposit has a long history,and can be dated to Period of Spring and Autumn ,so far it has provided more than 2 million tons copper which about 90% from native copper.The ore bodies are multistory and mainly occur in the gray white or gray green sandstones of Jinjiang Formation of Cretaceous,and a single ore-body is stratified or lentoid.The native copper is important as cement in sandstones.In this paper,the content of major elements,trace elements and rare earth elements of the redbed rock,ores,native copper and chalcocite were calculated using the correlation analysis to discuss the relationship between the element character and copper mineralization.Kinds of elements,such as Fe,Ag,As,Ba,Sr,are positive correlated with Cu, which show these elements are closely related to the native copper formation.The native copper mineralization is due to the underground thermal water,and this type fluid may be low temperature and weak reduction environment.

关 键 词:自然铜 砂岩 元素地球化学 相关分析 麻阳 湖南 

分 类 号:P618.41[天文地球—矿床学]

 

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