内蒙古西乌珠穆沁旗迪彦庙蛇绿岩的识别  

Recognition of Diyanmiao ophiolite in Xi U jimqin Banner,Inner Mongolia

作　　者：李英杰[1] 王金芳[1] 李红阳[1] 董培培[1] 刘玉翠[1] 刘德武[1] 白卉[1] 

机构地区：[1]石家庄经济学院,石家庄050031

出　　处：《岩石学报》2012年第4期1282-1290,共9页Acta Petrologica Sinica

基　　金：中国地质调查局项目(1212011120701);河北省科技计划项目(11277106D;12276709D);河北省教育厅科研计划项目(Z2010295)联合资助

摘　　要：新识别出的内蒙古西乌珠穆沁旗迪彦庙蛇绿岩位于中朝古板块与西伯利亚古板块之间的兴蒙造山带中部。通过对迪彦庙蛇绿岩进行详细的野外地质调查和岩石学、岩石地球化学的研究,发现迪彦庙蛇绿岩由孬来可吐和白音布拉格两个蛇绿岩带组成,各带宽约3km,延伸约30km,蛇绿岩各单元出露齐全。岩性由下到上主要为蛇纹石化方辉橄榄岩、层状-块状辉长岩、斜长岩、细碧岩、枕状玄武岩、角斑岩-石英角斑岩及硅质岩。蛇纹石化方辉橄榄岩稀土配分模式具SSZ型蛇绿岩的地幔橄榄岩特征;枕状玄武岩具岛弧拉斑玄武岩(IAT)特征;硅质岩的Al2O3/(Al2O3+Fe2O3)比值显示大陆边缘沉积环境特征。Firstly recognized Diyanmiao ophiolite occurs in Xing＇anling-Mongolian Orogenic Belt（XMOB） between the Sino-Korean paleoplate and the Siberian paleoplate in the central sector of Inner Mongolia,According to field geological investigation and the preliminary results of petrology and geochemistry,we found Diyanmiao ophiolite consists of Baiyinbulage ophiolite zone and Naolaiketu ophiolite zone,each of them is about 3km wide,30km long,and Diyanmiao ophiolite outcrops completely,including augite peridotite,beded-massive gabbro,anorthosite,spilite,pillow basalt,keratophyre,baschtauite,and chert from bottom to top,The chondrite-normalized REE patterns of augite peridotite represent a typical mantle section of the SSZ-type ophiolite,Pillow basalt has the island-arc tholeiite（IAT） features,The values of Al2O3/（Al2O3＋Fe2O3） of chert display the characteristics of continental margin.

关 键 词：蛇绿岩 岩石学 地球化学 岛弧拉斑玄武岩 迪彦庙 内蒙古 

分 类 号：P588.125[天文地球—岩石学]