摘要
本文综合分析了西藏曲水岩基的Ph、Sr同位素组成特征,并运用同位素的混合模式对该岩基的物质来源和成因进行了进一步的深入研究。结果表明,该岩基的Ph、Sr同位素组成较好地符合三元混合模式。结合冈底斯岩带的地质、构造及其他地球化学特征,得出曲水岩基花岗岩类岩石的物质来源包括幔源岩浆、前造山带和上地壳物质三部分。
This paper deals with Pb and Sr isotopic characteristics of the Quxu batholith. According to the isotopic mixing model, the origin of this batholith has been further studied. It is shown that the Pb and Sr isotopic compositions are consistent with the three-component mixing model. In terms of the geology, tectonics and geochemistry of the Gangdise petrographic belt, the man-tlederived magma, the preorogenic belt and the upper crust may be the three material sources of granitoid rocks of the Quxu batholith.
出处
《地球化学》
CAS
1987年第1期60-66,共7页
Geochimica
