羌塘东部治多县索加一带早石炭世杂多群火山岩特征及其构造环境

The geochemical characteristics and tectonic setting of volcanic rocks from early Carboniferous Zaduo group in Suojia area,Zhiduo County,eastern Qiangtang

羌塘东部冶多县索加一带的杂多群火山岩是由玄武岩组成的基性熔岩,属钙碱性玄武岩系列,稀土元素特征表现为轻稀土显著富集,Eu为轻微负异常,富集大离子亲石元素,高场强元素分异,反映了板内拉张环境特征。

The volcanics of lower Carboniferous Zaduo group which is found in Zhiduo county, weastem Qiangtang block, is mainly consist of basic lavas. These basalt rocks are belongs to calc - alkali rock series, and have get enriched in light rare earth elements and lithophile elements, and slightly negative Eu anomaly, and fractionated high field strength elements, which indicate these basalt lavas formed in intra - continental extension environment.