Geochemistry of the Granites in the Tamuqi Area on the Southern Margin of Tarim Block

摘要

This study shows that the intrusive rocks distributed in the Aoyiqieke-Tamuqi area on the southern margin of the Tarim Bock are composed fo gabbro, diorite, granodiorite and granite, which constitute reigonally a nearly EW-trending tectono-magmatic belt. Petrochemi- cally the diorite, granodiorite and granite belong to the calc-alkaline, high-K series, with Na_2O/K_2O ratios varyign between 0.83 and 2.63. M/F ratios in the diorite are within the Range of 0.44-0.70 and those of the granodiorite (granite) are 0.45-0.87.