西准噶尔夏尔莆岩体岩浆混合的地球化学证据  

Geochemical Evidence of Magma Mingling of Xiaerpu Granite in West Junggar,Xinjiang

作　　者：张洪伟[1] 康磊[2,3] 赵春环[4] 何晓刚[1] 李永军[2] 

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局第七地质大队,新疆乌苏833000 [2]长安大学地球科学与资源学院,陕西西安710054 [3]中国地质调查局西安地质调查中心,陕西西安710054 [4]新疆维吾尔自治区地质矿产勘查开发局第一地质大队,新疆昌吉831100

出　　处：《西北地质》2011年第2期41-50,共10页Northwestern Geology

基　　金：国家自然科学基金项目(40534020);新疆维吾尔自治区地质矿产调查项目(XJZBKD2006-3)资助

摘　　要：夏尔莆岩体是西准噶尔地区典型的岩浆混合花岗岩体之一,由寄主岩石、微细粒镁铁质包体、中基性岩墙群3部分组成。元素地球化学成分的双扩散和相关度是判别岩浆化学混合的最有效手段之一。寄主岩石和中基性岩墙群的地球化学特征差异明显,具不同的演化特征。微细粒镁铁质包体与寄主岩石之间存在强烈的元素双扩散作用,与中基性岩墙又存在亲缘性,地球化学特征具两者之间的过渡性。初步认为夏尔莆岩体是以寄主岩石为代表的地壳岩浆和以微细粒镁铁质包体和中基性岩墙代表的地幔岩浆之间混合的产物。地球化学显示的岩浆混合信息印证了岩相学揭示的岩浆混合成因,为解决该岩体久存的成因分歧从地球化学角度提供了重要依据。Xiaerpu granite is one of the typical magma mixing granites in West Junggar,which is composed of the host rock,mafic microgranular enclave,and basic dyke swarm.The double diffusion and relativity of geochemistry are one of the most effective means of differentiating magma mixing.Petrochemistry features are difference between the host rock and basic dyke swarm which have distinct evolution.There was strong double diffusion between the host rock and mafic microgranular enclave,and affinity between mafic microgranular enclave and basic dyke swarm.Xiaerpu granite is the mixture between mantle magma represented by mafic microgranular enclave and basic dyke swarm and crust magma represented by the host rock.Magma mixing information from geochemistry is in conformity with petrographical feature,which support magma mixing,providing an important proof for solving the difference of Xiaerpu granite＇s origin from petrographical field.

关 键 词：岩浆混合 地球化学 夏尔莆岩体 西准噶尔 

分 类 号：P959[天文地球—自然地理学]