东昆仑造山带诺木洪郭勒早古生代火山活动  

Early Paleozoic Volcanism in Nuomuhongguole Area, East Kunlun Orogenic Belt

作　　者：朱云海[1] 王国灿[1] 贾春兴 林启祥[1] 王青海 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074 [2]青海省地质调查研究院,青海西宁810012

出　　处：《地球科学（中国地质大学学报）》2003年第6期606-614,共9页Earth Science-Journal of China University of Geosciences

基　　金：中国地质调查局1:25万阿拉克湖幅区域地质调查项目(No.19991300004021);高等学校全国优秀博士论文作者专项资金项目(No.200228).

摘　　要：诺木洪郭勒一带发育早古生代火山岩,可明显分为2种类型:一类为基性火山岩组合,岩石主要为具枕状构造的玄武岩,SiO2碱度均较低,为拉斑系列玄武岩,稀土、微量元素特征及构造环境判别显示其形成于洋中脊的构造环境;另一类为中基性火山岩组合,火山岩岩石类型复杂,熔岩和火山碎屑岩均较发育,熔岩成分从基性到中酸性均有,火山岩SiO2成分变化较大,既有亚碱性,又有碱性,亚碱性系列岩石多属钙碱性系列.稀土、微量元素特征及构造环境判别其形成于火山弧的环境.Early Paleozoic volcanic rocks developed in Nuomuhong area can be devided into two types. One is the basic volcanic assemble, mainly consisting of tholeiite basalts with low SiO2 and alkali. Its characteristics of REE, trace elements and tectonic setting reveal that it formed in middle ocean ridge tectonic setting. The other is called middle-basic volcanic assemble with complex rock types and well developed lava and pyroclastics. The volcanic rocks belong to subalkali and alkali series, and the subalkali rocks belong to calalkali series. The charecteristics of REE, trace elements and tectonic setting indicate that they formed in volcanic arc tectonic setting.

关 键 词：东昆仑造山带 早古生代 火山岩 诺木洪郭勒 

分 类 号：P588.1[天文地球—岩石学]