摘要
喇嘛苏矿床的硫化物单矿物铅同位素呈线性分布，但其拟合直线与铅同位素生长线只有一个交点．它们是二元混合铅继续演化的结果．拟合直线的斜率反映二元混合的时间．计算结果表明，喇嘛苏矿床成矿物质最初混合的时间是１．７６Ｇａ，铅同位素μ值表明物质具有地幔与上地壳的混合来源．经过一段时间的演化后，海西期通过中元古代初期构造层的重熔形成岩浆，引起喇嘛苏矿区的大规模成矿作用．
Lead isotopes of the monominerals of sulphide in the Lamasu Deposit are linearly dependent, but their fitting line intersects the growth curve of lead isotope at only one point, which is the result of further evolution of the two mixture lead. The slope of the fitting line of m ( 206 Pb)/ m ( 204 Pb) with m ( 207 Pb)/ m ( 204 Pb) inflects the age of mixture. The calculation indicates that the metallogenetic material of the Lamasu Deposit originated from mantle and upper crust as showed by μ values of lead isotope mixed 1.76 Ga ago. Having evolved for a long time, the structural layer of primary Mid Proterozoic remelted in Hercynian period to form magma, which caused a large scale metallogenesis in the Lamasu mineral district.
出处
《中南工业大学学报》
CSCD
北大核心
1999年第4期364-367,共4页
Journal of Central South University of Technology(Natural Science)
基金
国家"九五"科技攻关计划基金
关键词
铅同位素
年龄
喇嘛苏铜矿
铜矿床
lead isotope
age
the Lamasu copper deposit
Xinjiang
