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A Discussion on Age and Tectonic Significance of Ophiolitein Eastern Junggar,Xinjiang

HE Guoqi+{1)} LI Maosong+{1)} JIA Jindou+{2)} ZHOU Hui+{1)} (+{1)}Department of Geology,Peking University,Beijing,100871; +{2)}Research Institute of Exploration and Development,CNPC,Beijing,100083)  
There are two ophiolite belts,Armantai and Kelamaili ophiolite belts,in northeastern border of the Junggar basin,Xinjiang.Ages of the ophiolite and geological time of their emplacement of these two ophiolite belts are still not clear though many research works have be done since 1981.According to new data of isotopic age determination,microfossils in the ophiolite suite and regional tectonic analysis,this paper get following new knowledge:geologic time of development of these two palaeo-oceans representing by two ophiolite belts were close,and it might be from late Neo-proterozoic to early Silurian.The nascent oceans were formed in late Neo-proterozoic.The oceans were in a period of great prosperity from Cambrian to early-middle Ordovician.And they were withered and closed from late Ordovician to early Silurian.This new knowledge is important to reconstruction of Palaeo-Asian Ocean and understand continental crust evolution of Northern Xinjiang.
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