Major and trace element geochemical characteristics and petrogenesis of Dabuxiletu pluton in the north part of Sonid Left Banner，Inner Mongolia

Abstract：Content and characteristic numerical values of major and trace elements contain much genetic information, such as source region, evolution and formation environment of magma. The Dabuxile pluton is located near the northern side of the Erlian-Hegenshan suture belt that is part of the suture zone of the North China plate and the Siberian plate (Xing-Meng orogenic zone) . Sampling of all rock types of the pluton was conducted to analyze content of REE and trace elements, and the results show that granodiorites composed of biotite granodiorite and granodiorite are genetically of I-S transitional type granite, whose rock-forming magma might have resulted from subducted oceanic slab and metagreywacke of the overlying partly-melted continental crust. Granites composed of monzogranite, biotite granite and potassium feldspar granite are genetically of S-type granites, whose rock-forming magma might have been derived from metamorphic pelite. The two types of granites were both generated from the continental arc, and are not adakitic rocks.