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Tectonic Division and Regional Tectonic Evolution of West Tianshan Organic Belt
详细信息   
摘要

Located in the southern part of Central Asia, the West Tianshan organic belt lies at the juncture between the Kazakhstan- Junggar ancient plate and the Tarim ancient plate and is composed of Paleozoic epicontinental rock series, oceanic crust relicts and Precambrian microlandmass. Its structural evolution process is a miniature of the evolution of the Northern Xinjiang paleo-Asiatic Ocea. It experienced the formation of continental nucleus in Archean-early Proterozoic period, the evolution of Ancient Tianshan oceanic basin in late Proterozoic period, and the generation of a unified Xinjiang part of Gondwana in late Proterozoic period. In late Proterozoic period, Tianshan region, as a part of the paleo-Asiatic Ocean, began cracking; in Cambrian period this region entered the peak stage of expansion; in Ordovician-Carboniferous period, the ancient subduction zone was formed, and the ancient ocean basin was continually contracted; in Late Carboniferous period, the Tianshan ancient ocean basin was closed, with the formation of an unified continental crust; in Middle Cenozoic period, the region entered into the intracontinental evolution stage.

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