摘要
青藏高原措勤盆地新生代火山活动十分强烈，以古近纪林子宗群火山岩为代表，主要分布在盆地中央隆起带的冈底斯构造岩浆岩带中，在北部坳陷带中仅有零星分布。林子宗群火山岩主要由安山岩、流纹岩、中酸性熔岩和火山碎屑岩组成。岩石化学研究表明属钙碱—高钾钙碱系列；岩石地球化学研究表明，林子宗群火山岩具岛弧火山岩特点。
Violent volcanic eruption occurred in the Chuoqin Basin of Qinghai Tibetan Plateau during Cenozoic era, resulting in volcanic rocks consisting of andesite, rhyolite, intemediate acid lava flow and pyroclastics known as the Linzizong Group which are distributed mainly in the Gangdise tectono volcanic belt of the central uplift in the Chuoqin Basin but sparsely scattered in the north depression. Petrochemical study suggests the volcanics are of calc alkalic to high potassium calc alkalic suite; Geochemical study indicates that they are akin to the island are type formed by collision of the Himalayian plate with the Gangdis Nianqing Tangula plate.
出处
《地质力学学报》
CSCD
1999年第2期65-70,共6页
Journal of Geomechanics
基金
原石油天然气总公司新区青藏项目
关键词
青藏高原
措勤盆地
火山岩
构造环境
地球化学
Qinghai Tibetan Plateau
Cuoqin Basin
Volcanic rock
Tectonic setting
