摘要
陕西省大茅坪铜矿床产于碧口群火山岩地层中 ,矿床的成因与成矿物质的来源均与火山岩相关。通过矿石和围岩微量元素、稀土元素、Sr和 Pb同位素的示踪 ,认为矿床是喷流沉积的产物 ,成矿年龄与碧口群火山岩形成年龄相近 ,在 12 0 0 Ma左右。矿石铅同位素特征显示大茅坪铜矿床有后期热液改造成矿作用的参与 ,这与地质认识相吻合 ,从而得出矿床成矿物质主要来源于赋矿火山岩 ,在喷流沉积成矿的基础上 ,有后期变质流体的叠加改造 。
Damaoping copper deposit lies in volcanic rocks of Bikou Group,with which ore forming elements are closely related. This paper has analyzed the relation between ore and volcanic rocks using geochemical data, such as rare earth elements, trace elements, and Sr,Pb isotopes.The geochemical composition of ore and volcanic rocks reveals that the ore forming elements mainly originate from the basic volcanic in Bikou Group,but some of them come from metamorphic fluid on the basis of volcanic exhalation mineralization.
出处
《地质科技情报》
CAS
CSCD
北大核心
2002年第3期69-73,共5页
Geological Science and Technology Information
基金
国土资源部"九五"科技攻关项目 (95 -0 2 -0 0 2 )
关键词
火山岩
构造环境
碧口群
铜矿床
成矿元素
陕西
volcanic rock
tectonic environment
Bikou Group
copper deposit
ore forming element
