藏北鱼鳞山地区鱼鳞山组火山岩的特征及时代探讨

Deliberation on Characteristic and Epoch of the Volcanic Rocks of the Yulinshan Formation in the Yulinshan Area, North Tibet

鱼鳞山组是青藏高原已知最新的火山岩石组合之一,属陆内裂谷型碱性火山岩,它反映了印度板块与亚洲板块碰撞后与板内造山相关的构造—岩浆作用,是青藏高原由挤压向伸展转换的标志,因而,进一步认识鱼鳞山组火山岩的特征并重新审视其时代具有重要意义。

The Yulinshan formation of being known as one of the youngest volcanic assemblages in the area of Tibet Plateau falls within intracontinental rift-type alkaline volcanic rocks, which reflects tectonic and magmatic activities relevant to intraplate orogeny after the collision between the Indian Plate and the Asian Plate as a mark in the transformation of compression to extension for the Qinghai-Tibet Plateau, therefore it is significant to further investigate the characteristic of volcanic rocks of the Yulinshan formation and newly examine its epoch.