摘要
青藏高原措勤盆地早白垩世火山活动十分强烈，则弄群火山岩主要分布在措勤盆地中央隆起带的冈底斯构造岩浆岩带中，则弄群以安山岩—英安岩—流纹岩钙碱性系列火山熔岩及火山碎屑岩为主，盆地北部坳陷带中火山活动相对较弱，见有少量玄武安山岩、安山岩。则弄群火山岩岩石化学、地球化学特征分析表明，该火山岩形成于岛弧区构造环境中。
The volcanic activities were extensive in Cuoqin Basin of Qinghai Xizang plateau during the Early Cretaceous. The volcanic rocks of Zenong Group in the Early Cretaceous occurred mainly in Gangdisi volcanic rock belt in the central uplift of the basin. The Zenong Group was dominated by calcalkaline volcanic suite (andesite dacite rhyolite) and pyroclastic rocks. The volcanic activities were light in the northern depression with a little basaltic andesite and andesite. The lithochemical and lithogeochemical analyses of the Zenong Group show that the volcanic rocks formed in the tectonic enviroment of inland arc, which is related to the palaeotethys ocean crust subduce towards north along the Yarlung Zangbo river.
出处
《石油大学学报（自然科学版）》
CSCD
1999年第5期17-19,23,共4页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
中国石油天然气集团公司新区事业部青藏项目
关键词
青藏地区
措勤盆地
火山岩
地球化学特征
白垩统
Qinghai Xizang area
Cuoqin basin
Zenong Group
volcanic rock
geochemical characteristics
tectonic enviroment
