西准噶尔夏尔莆岩体岩浆混合岩石化学证据  

PETROCHEMICAL EVIDENCE OF MAGMA MINGLING FOR THE XIAERPU GRANITE IN WEST JUNGGAR

作　　者：何晓刚[1] 康磊[2] 王晓刚[1] 李永军[2] 张洪伟[1] 

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,西部矿产资源与地质工程教育部重点实验室,陕西西安710054

出　　处：《新疆地质》2011年第3期251-256,共6页Xinjiang 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)联合资助

摘　　要：夏尔莆岩体是西准噶尔地区较典型岩浆混合花岗岩.岩体由寄主岩石(中酸性侵入岩)、微粒镁铁质包体和中基性岩墙群3部分组成.寄主岩石(中酸性侵入岩)与微细粒镁铁质包体具相似岩石化学特征,有明显元素双扩散现象.在图解中,寄主岩石具良好线型岩浆混合演化特征,微细粒镁铁质包体也位于演化趋势上,显示两者具共同成因联系,中基性岩墙群具独立演化趋势,属不同岩浆端元.岩石化学显示的岩浆混合信息与岩相学表现的岩浆混合特征完全吻合,支持岩浆混合成因认识,为解决该岩体成因分歧提供重要依据.Xiaerpu granite is a typical magma mixing granite in West Junggar. are composed of the host rock（intermediate-acid intrusive rocks）,maric microgranular enclave, and basic dyke swarm.Although petrographical feature provide a important proof for magma mixing, but the double diffusion and relativity of petrochemistry are one of the most effective means of differentiate magma mixing. Petrochemistry feature of marie microgranular enclave is similar to the host rock, showing strong double diffusion. In diagram, the host rock＇s evolution is linear which according with magma mixing, and maric microgranular is also in the evolution linear which show that the origin of them is similar relation, but the evolution tendency of basic dyke swarm is defter from them which show host rock and basic dyke swarm belong to different magmatic chamber. Magma mixing information from petrochemistry is in conformity with petrographical feature, which support magma mixing, and providing a important proof of magma mixing from another field.

关 键 词：西准噶尔 夏尔莆岩体 岩浆混合 岩石化学 

分 类 号：P588.1[天文地球—岩石学]