Abstract
The southeast region of the Qinghai-Tibetan plateau is the region where the Indian subcontinent collided with Eurasia to form arcuate mountain chains along what is now the border area of China, India and Burma. On the basis of Cenozoic deformation, metamorphism and magmatic activity, we can divide this orogenic zone into three tectonic sections: the External, Medial and Internal arcuate belts. These in turn are divided into seventeen major nappes, delineated in a SW to NE cross-section through the orogenic zone. The External belt, composed of the western nappes, contains traces of late Mesozoic and Cenozoic sutures which have undergone significant disruption due to Cenozoic orogenesis; and its Paleozoic strata show affinities to the Gondwanaland facies. The Medial belt, including most notably the nappes of the Jinsha River region, contains the remains of an ancient ocean, very probably the Paleo-Tethys, which separated the Gondwana and Yangzi paleolandmasses in late Paleozoic — early Triassic time. The Internal belt, composed of the eastern nappes, consists mainly of flysch from China's largest Triassic sedimentary basin; and its Paleozoic strata belong to the Yangzi plate.
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