摘要
统计表明,我国花岗岩呈锶同位素组成,以秦岭—大别山造山带为界,南北呈现明显的差别。北方地区的花岗岩初始锶同位素比值90％的数据小于0.710,伴生的主要成矿元素为上地幔中富含亲铁性和亲硫性较强的元素,花岗岩的物质来源较深。南方花岗岩初始锶同位素比值80％的数据大于0.710,伴生的主要成矿元素为在地壳硅铝质岩石中富集的亲石性元素,花岗岩的物质来源较浅。
The statistics show that Sr isotopic compositions of granites in the north part and south part of China,bounded by the Qinlitng-Dabie oregenic zone,are obviously different.Initial Sr ratios from the granites of north up to 90% are lower than 0.710. Associated major metallogenetie elements are strongly siderophile and sulphophile elements from upper mantle.This indicates the granites derived from deeper levels. While the ratios for 80% granites of south are higher than 0.710.Associated major metallogenetie elements are lithophile elements from upper crust.
关键词
花岗岩
锶
同位素
地壳型
研究
granite, initial Sr isotope ratio, crust-type, mantle-type, crust-mantle igmeous type
