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《Acta Scicentiarum Naturalum Universitis Pekinesis》 2001-01
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Significance of Paleostructure and Paleogeography of Ordovician-Silurian Rock Associations in Northern Xinjiang,China

HE Guoqi LI Maosong (Department of Geology,Peking University,Beijing,100871)  
Traditional tectonic ideas are that the orogenic belts in the northern Xinjiang were formed mainly in the late Paleozoic.However,new data show that there is almost continuous early Paleozoic orogenic belt surrounding the Junggar Basin.The facts will change the traditional idea which only emphasizes the late Paleozoic orogenesis.According to the new data,authors reconstructed the early Paleozoic geologic evolution of the Northern Xinjiang.The Junggar and adjacent old lands began to breakup in the Sinian period.The ancient ocean between those old lands came up to the biggest size at early Ordovician.The inferential Junggar old land often situated below sea level in the period of cracking and spreading of the old land.The ancient ocean of the Northern Xinjiang began to shrink and the old continental margin became active margin in the late Ordovician.Then,convergence,collision and orogenesis were took place among the Junggar,Yili and Siberia old lands.The late Ordovician and early middle Silurian forearc or back arc foreland basins might develop on the side of earn Junggar old land of the early Paleozoic orogenic belts.
【Fund】: 国家“九五”科技攻关基金资助项目!(96 915 0 7 0 1)
【CateGory Index】: P548
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