东准库布苏南岩体岩石化学特征及其地质意义  

PETROCHEMISTRY FEATURE AND TECTONIC SIGNIFICANCE OF THE KUBUSUNAN GRANITIC ROCK MASS IN EAST JUNGGAR,XINJIANG

作　　者：闫存兴 杨高学[2] 李永军[2] 吴宏恩 司国辉[2] 张永智 

机构地区：[1]新疆维吾尔自治区有色地质矿产勘察院,新疆乌鲁木齐830000 [2]长安大学地球科学与资源学院,陕西西安710054

出　　处：《新疆地质》2008年第3期220-224,共5页Xinjiang Geology

基　　金：新疆青河、奇台县红柳沟-苏吉泉一带1∶5万区域地质矿产调查(QD200508)资助

摘　　要：新疆东准噶尔卡拉麦里地区库布苏南岩体以花岗闪长岩为主,岩石具似斑状结构和块状构造.岩石化学研究表明,岩体具富SiO2(64.24%～67.75%)、低Al2O3(16.06%～22.00%)、富Na2O+K2O(7.03%～7.50%)特征,且Na2O>K2O,标准矿物中出现刚玉分子,属于准铝质高钾钙碱性Ⅰ型花岗岩类型.较低的DI(69.49～76.62)、FL(64.32～71.56)和MF(69.58～76.00),表明岩体具有壳-幔混合作用的特征.结合东准噶尔卡拉麦里地区晚古生代构造-岩浆演化过程分析,岩体形成于卡拉麦里造山带的大陆主碰撞后初始拉张阶段[(300±10)Ma],属后碰撞花岗岩,它是幔源岩浆在壳下和壳内不同深度上发生垫托,壳幔物质发生不同程度的分熔、混合和交换的产物.Grunodiorite is main lithological character of the Kubusunan rock in Kalamaili area,East Jungar, Xinjiang, rock charactertics of like-porphyro-texture and block structure. Study of petrochemistry, rocks high SiO2 （64.24%～67.75%）,1ow Al2O3 （16.06%～22.00%）,rich Na2O＋K2O （7.03%～7.50%）,Na2O〉K2O, have norm mineral corundum,belongs to sub-aluminum,high potassium,calc-alkalinity,I type granite, lower DI（69.49～76.62）,FL（64.32～71.56） and MF（69.58～76.00）,stands for rocks mixed by mantle magma. Based on tectonics-magma evolution of the Later Paleozoic era in Kalarnaili area,East Jungar, indicated that rock formed in initial stretch stage of the main-eollision（300±10Ma） inthe Kalamaili orogenic zone,belongs to post-collision granite type,that is formed by marie magma under or up to crust in different depth,crust-marie material melting, mixing and exchanging in different degree.

关 键 词：东准噶尔 卡拉麦里 库布苏南花岗岩 岩石化学 地质意义 

分 类 号：P584[天文地球—岩石学]