新疆东昆仑木孜塔格蛇绿混杂岩中发现富Nb玄武岩  

NB - ENRICHED BASALTS FOUND IN MUZTAG OPHIOLITIC MELANGE,EASTERN KUNLUN MOUNTAIN, XINJIANG

作　　者：兰朝利[1,2] 何顺利[1] 魏俊之[1] 李继亮[3] 

机构地区：[1]石油大学石油工程系 [2]中国科学院地质与地球物理研究所岩石圈构造演化开放实验室,北京100029 [3]中国科学院地质与地球物理研究所岩石圈构造演化开放实验室

出　　处：《地质与勘探》2002年第3期55-59,共5页Geology and Exploration

基　　金：国家"九五"科技攻关305项目(96-915-06-03)资助

摘　　要：富Nb 玄武岩以相对高的TiO2 含量、低的LILE/HFSE和LREE/HFSE比值以及(La/Nb)MN＜2为特征,是岛弧环境的典型产物。首次报道发现于新疆东昆仑木孜塔格蛇绿混杂岩中的富Nb玄武岩,并分析了它们的典型地球化学特征和构造环境,表明了它们形成在岛弧环境。Nb - enriched basalts are characterized by relatively higher TiO2 contents, lower LILE/HFSE and LREE/HFSE , and (La/Nb) MN < 2.They are typical productions of island arc environment. This paper first reported Nb - enriched basalts found in the Muztag ophiolitic melanges, EastemKunlun Mountain of Xinjiang, and discussed their typical geochemical characteristics and tectonic settings, which manifested that they had formed in theisland arc environment.

关 键 词：新疆 木孜塔格 蛇绿混杂岩 富Nb玄武岩 岛弧 构造环境 

分 类 号：P588.145[天文地球—岩石学]