中文摘要：

新疆东准噶尔卡拉麦里构造带分布多种类型花岗岩,主要包括花岗闪长岩、二长花岗岩和钾长花岗岩。对处于卡拉麦里主断裂带西侧的奥塔乌克尔希花岗闪长岩体进行年代学和地球化学特征研究,岩体SiO2含量中等,相对富含钠,A/CNK在0.93-0.99,具准铝质中等钙碱性岩系特征。其轻稀土元素富集,具微弱铕负异常,明显富集Rb,Sr,Th等大离子亲石元素和Zr,Hf等高场强元素,强烈亏损元素Nb,Ta,Ti,为I型花岗岩。锆石LA-ICP MS测年为（329.1±1.3）Ma和（305.7±1.5）Ma,分属于早石炭世维宪期和晚石炭世卡西莫夫期,岩体定位于晚石炭世晚期。主微量及稀土元素综合分析表明该岩体具复杂成因,早石炭世晚期卡拉麦里地区洋壳消减,造山作用形成新生陆壳物质,晚石炭世后碰撞构造阶段地幔底侵岩浆引起地壳物质的部分熔融形成了奥塔乌克尔希岩体。综合研究表明,东准噶尔洋盆闭合发生在早石炭世维宪期,晚石炭世晚期准噶尔地区东部已进入新沉积盆地构造发育时期。

英文摘要：

There are plenty types of granites around the Kalamaili structural belt in East Junggar of Xinjiang,mostly including granodiorite,monzonitic granite,alkali-feldspar granite and alkali granite.This paper studied the dating of the Aotawuke’erxi granodiorites in the west of principal structural belt and their geochemical compositions.The result shows that the granites are characterized by medium SiO2 contents,modicum K-feldspar,amphibole and blotite contents,comparative enrichment natrium,and dominated plagioclases among the feldspars.The ratio of A/CNK is varying from 0.93 to 0.99,showing characteristics of metaluminous and medium calc-alkalic rock series.The granites are characterized by enrichment in LREE,not obvious depletion in Eu.For the trace elements of granites,large-ion lithophile elements of Rb,Sr,Th etc.and high field strength elements of Zr,Hf etc.are rich obviously,but Nb,Ta,Ti appear strong depletion.The main body of granites are I-type granodiorite.The LA-ICP MS ages of zircon are（329.1±1.3） Ma and（305.7±1.5） Ma.Geochemical elementary and regional geology analysis indicated that the orogenic collision at east Junggar presented during the early late-carboniferous periods,and the orogenic movement ended at the teminal of late-carboniferous periods.