黄羊山岩体岩石化学特征.docVIP

第31卷第1期 地球科学与环境学报 V01．31 No．1 2009年3月 Journal of Earth Sciences and Environment Mar．2009 东准噶尔卡拉麦里地区黄羊山岩体岩石学特征 杨高学1，李永军1，司国JF 1，吴宏恩2，张永智2，金 朝1 (1．长安大学地球科学与资源学院．陕西西安710054I 2．新誓维吾尔自治区有色地质矿产勘查院，新疆乌鲁木齐830000) 摘要：在前人研究基础上，对黄羊山岩体取得了新的认识：萨北岩体和苏吉泉岩体只是黄羊山岩体的一个组成 部分，并非单独岩体。黄羊山岩体寄主岩石划分为中粒黑云母碱长花岗岩，中粒角闪石碱长花岗岩、中粒钠铁闪 石碱长花岗岩、中细粒钠铁闪石碱长花岗岩、细粒黑云母碱长花岗岩和细粒混合花岗岩(台石墨)6个单元。岩 石学及矿物特征表明。岩体有从黑云母碱长花岗岩向钠铁闪石碱长花岗岩演化的趋势，可能是幔源重熔分异的 碱性花岗岩(A型花岗岩)，而闪长质微细粒包体及大量发育的闪长(玢)岩脉和辉绿(玢)岩脉提供了有力的佐 证，初步研究认为黄羊山岩体形成于后碰撞张性环境．其就位与卡拉麦里断裂有关，其形成和演化标志了准噶尔 地区显生宙幔源岩浆活动及其分异产物导致大陆地壳垂向生长过程。 关键词：岩石学特征；包体；岩浆混合作用；黄羊山岩体；东准噶尔 中图分类号：P581文献标志码：A文章编号：1672— 6561(2009)01— 0034-08 Petrological Characteristic of the Huangyangshan Intrusion in Kalamaili Area，East Junggar，Xinjiang YANG Gao— xuel，LI Yong-junl，SI GUO— huil， WU Hone— en2，ZHANG Yong-zhi2。JIN Zha01 (1．School ofEarth Sciences andResources，ChanganUniversity，Xian 710054，Shaanxi，China， 2．Xinjiang Institute of Geological Exploration for Nonferrous Resources，Urumqi 830000，xi可iang，China) Abstract：Based on predecessor’s research work，new understanding about Huangyangshan intrusion has been got．Sabei and Sujiquan granites are only parts of the Huangyangshan intrusion，but not the single intrusion．The host rock of Huangyangshan intrusion may be divided into 6 units，that is，medium-grain biotite alkali— feldspar granite，medium-grain amphibole alkali— feldspar granite，medium-grain arfvedsonite alkali— feldspar granite， medium-fine grain arfvedsonite alkali— feldspar granite，fine grain biotite alkali— feldspar granite and fine-grain mixing granite(including graphite)．Petrological and mineralogical Characteristics show that the rock evolution presents the tendency from biotite alkali— 。feldspar granite to arfvedsonite alkali· -feldspar granite that may belong to alkali granite(A— type granite)produced by remehing differentiation from mantle magma，which is powerfully evidenced by the existence of microgranular dioritic enclaves。massive ci：oritic(porphyrite)dike and diabase (porphyrite)dike． It i