论文部分内容阅读
引言西藏镁铁岩和超镁铁岩属世界性东西向阿尔卑斯超镁铁岩带的一部分。其中超镁铁岩岩体约40个,总面积约6500平方公里;镁铁岩体较少,多与超镁铁岩伴生。这些岩体大体上组成两个近东西向展布的岩带,简称藏北岩带和藏南岩带,各延伸达1500公里以上,其区域地质构造环境各异,并且有不同的岩石组合特征。本文在对比西藏超镁铁岩的基础上,对其成因作初步讨论。
Introduction Tibet mafic and ultramafic rocks are part of the worldwide east-west Alpine ultramafic belt. Thereinto, there are about 40 ultramafic rocks with a total area of about 6,500 km2; less mafic rocks are associated with ultramafic rocks. These rock masses generally constitute two nearly east-west distribution rock belts, referred to as the northern Tibet belt and the southern Tibetan belt, each extending over 1,500 kilometers, the regional geological tectonic environment, and have different rock characteristics. Based on the comparison of the ultramafic rocks in Tibet, this paper makes a preliminary discussion on the causes.