西天山阿吾拉勒阔尔库岩基解体的地球化学证据及意义  

THE GEOCHEMICAL EVIDENCE AND ITS SIGNIFICANCE OF THE "DISINTEGRATION"OF THE KUOERKU GRANITE BATHOLITH IN AWULALE,WESTERN TIANSHAN

作　　者：杨高学[1] 周继兵[2] 栾新东[2] 郭文杰[2] 毕明波[1] 李宏[2] 佟黎明[2] 李永军[1] 

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]新疆维吾尔自治区地质矿产勘查开发局第九地质大队,新疆乌鲁木齐830000

出　　处：《新疆地质》2008年第2期128-132,共5页Xinjiang Geology

基　　金：新疆新源县托库兹库马拉克一带1∶5万区域地质矿产调查(XJQDW-2003-07)资助

摘　　要：西天山阿吾拉勒阔尔库岩基被解体为早石炭世赛肯都鲁序列和早二叠世阔尔库序列.稀土微量元素研究表明,赛肯都鲁序列低Ba,高Sr,低稀土总量,贫LREE,类似埃达克岩.LREE/HREE=2.5,δEu=0.89,为幔源岛弧花岗岩,与研究区早石炭世大哈拉军山组钙碱性火山岩共同构成了岛弧火成岩组合.阔尔库序列高Ba,低Sr,高稀土总量,富集LREE,LREE/HREE=6.3,δEu=0.67,为壳源后造山花岗岩,与晚石炭—早二叠世大陆裂谷环境双峰式火山岩共同构成碰撞后火成岩组合.地球化学特征为该岩基解体提供了有力的证据.The Kuoerku batholith of the Awulale in western Tianshan is disintergrated into two intrusive series,one is early Carboniferous Saikendulu series,another is early Permian Kuoerku series,they are obvious different studied by trace element and REE,. The former is characterized by rich St, poor Ba and LREE, LREE/HREE=2.5,δEu=0.89, similar to Adakite,be derived from mantle, belongs to island arc granite,the one and calc-alkline volcanic rock of the early Carboniferous Dahalajunshan Formation constitutes island arc igneous group in research area;The later is characterized by poor Sr, rich Ba and LREE, LREE/HREE=6.3,δEu=0.65,be derived from crust, belongs to post-orogenic granite,the one and alkline bimodal volcanic rock of the later Carboniferous-early Permian in continent-rift surroundings constitutes post-collision igneous group. The characteristics of geochemistry evident the disintegaration of the Kuoerku batholith.

关 键 词：西天山 阿吾拉勒 阔尔库岩基 解体 地球化学 

分 类 号：P588.14[天文地球—岩石学]