西准噶尔地区以广泛发育正ε(Nd)值的I型和A型花岗岩为特征，反映了年轻的地壳物质源区组成。课题组在该区玉依塔勒盆克提一带发现了一套似斑状石榴石花岗岩，尽管石榴石可以出现在I、A型花岗岩中，但更易于发育在S型花岗岩中。若其为S型，是否反映了源区古老地壳的信息？若为I、A型，它又将反映何种岩浆形成条件及其演化过程？石榴石的形成与岩浆源区组成、同化混染和结晶分异之间的关系是探讨这一重要问题的关键。本项目拟通过野外地质、岩石学、矿物学、元素和Sr-Nd-O同位素地球化学及锆石U-Pb年代学等研究深入剖析其岩石组合特征、矿物结构特征和形成的温度压力条件,查明其形成时代，探讨该区花岗岩中产出石榴石的形成机制和地质意义。

The West Junggar is characterized by the abundant I-type and A-type granites with hing positive ε (Nd) value and demonstrated a juvenile metriarial resources. We found a suite of the garnet-bearing porphyritic granites in the Yuyitalepenketi area in the West Junggar. Although garnet can appear in I, A-type granites, but it is more easier to develop in S-type granites. If the granite belongs to S-type, whether it reflects the information of ancient crustal source? Alternatively, if they are I-type or A-type granite, so what kind of conditions of magma formation and evolution processes it reflect? The relationship between the formation of garnet and composition of magma source, assimilation and fractional crystallization are the key to discuss this important issue. The field geological, petrological, mineralogical, geochemical, Sr-Nd-O isotope geochemistry will allow us to analyze the rock assemblages, texture of the minerals, temperature and pressure of magma. Zircon U-Pb geochronology for the granite will yield a formation age of them. These data will be used to probe the origin of the garnet from granite and its geological significances.