喇嘛苏铜矿区铅同位素特征及其意义——铅同位素年龄计算的一种新思路
来源期刊：中南大学学报(自然科学版)1999年第4期
论文作者：赖健清 彭省临 王核 邵拥军
文章页码：37 - 40
关键词：铅同位素;年龄;喇嘛苏铜矿;新疆
Key words：lead-isotope; age; the Lamasu copper deposit; Xinjiang
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．
Abstract: 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 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.
