川西双江口地区花岗岩的岩石学、地球化学特征及其成因研究

Petrology, Geochemistry and Genesis of Granitoids in the Shuangjiangkou Area, West Sichuan

双江口地区出露的花岗岩主要为二云二长花岗岩和似斑状黑云花岗岩,二者呈侵入接触关系,在岩体特征、岩石颜色、结构、矿物组成及后期改造等方面存在较为明显的差异。岩相学特征表明二云二长花岗岩形成晚于似斑状花岗岩,岩石地球化学特征表明二者成因为部分熔融,物源为壳源,形成环境为同碰撞-造山带环境,形成时间为印支晚期。

The granitoids intrusion in the Shuangjiangkou area consists mainly of two-mica adamellite and porphyroid biotite granite. The two-mica adamellite differs from porphyroid biotite granite in color, texture and mineral composition. Petrographic features indicate that the two-mica adamellite was emplaced after the porphyroid biotite granite. Lithogeochemical features indicate that they were crust-derived and emplaced in a syncollision-synorogenic conditions in the Late Indo-Chinese epoch.