摘要
对卡拉岗组火山岩岩石化学特征分析和研究结果表明 ,火山岩碱性程度为碱性 -钙碱性 ,岩石系列为高铝玄武岩系列、拉斑玄武岩系列及碱性玄武岩系列 ,求得钙碱指数为 5 2 ,属张性环境 ,在全碱—二氧化硅图上样品落入玄武岩区及流纹岩区 ,分异指数频率曲线表明具有大陆拉张的双峰式特点 。
By analyzing and studying the petrochemistry characteristics of the Kalagang Formation of Lower Premian volcanic rock in Saerbuer Mountain,the authors conclude that the alkalinity of this volcanic rock is alkaline and calc alkaline suites and its rock series consists of high alumina basalt, tholeiite and alkaline basalt.The calc alkaline index of the suites is 52,indicating the tensional tectonic setting.The distribution of these suites on the TAS diagram is the area of basalt and rhyolite,while their DI frequence curve shows bimodal of rift valley.Hence,it is concluded that the volcanic rock of Kalagang Formation of Lower Permian is produced in bimodal continential rift valley.
出处
《地质科技情报》
CAS
CSCD
北大核心
2002年第2期19-22,28,共5页
Geological Science and Technology Information
基金
原地矿部地调项目"巴音达拉幅
乌兰哈达幅 1: 5万区域地质调查"
关键词
新疆
沙尔布尔山
早二叠世
卡拉岗组
火山岩
岩石化学
构造环境
Saerbuer Mountanin
Lower Permian volcanic Formation of Kalagang
petrochemistry
tectonic setting
