西秦岭糜署岭岩浆混合花岗岩 地球化学特征及构造意义

西秦岭糜署岭岩体是壳幔岩浆混合的产物。从寄主岩石和基性端元暗色微细粒镁铁质包体的 主要元素、稀土元素岩石地球化学研究入手,深入探讨了糜署岭岩体是壳源和幔源两类岩浆混合形成的 混浆花岗岩,其岩石地球化学特征介于壳源和幔源两个端元之间并有显著的过渡特征,表明二者在岩浆 侵位过程中发生过不同程度地物质成分交换。这对研究西秦岭中生代壳幔混合作用和地壳增生有重要 意义。

Geochemical features of Mishuling hybrid magma granite and its tectonic significance in Western Qinling

The Mishuling granite of western Qinling originates from the mixture of crust and mantle magmas. This paper fur- ther clarifies the geochemistry of the major elements and the REEs in the granite and the muhc microenclaves, which is typ- ied of obvious fransitional characteristics between crust and mantle-derived magmas, indicating their exchange of composi- tions in variable extent as the magmas intruded and the hgrid origin of the granite. This has important significance for stud- ying the Mesozoic crust-mantle mixing and the crustal accretion there.