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THE FORMATION MECHANISM OF THE NIHEWAN PALRO-LAKE AND ITS RELATIONSHIP WITH LIVING ENVIRONMENT FOR EARLY ANCIENT HUMEN

YUAN Bao-yin~1,TONG Hao-wen~2,WEN Rui-lin~1,WANG Yan-hua~3(1.Institute of Geology and Geophiscs,Chinese Academy of Sciences,Beijing 100029,China;2.Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China;3.Administrative office of Nature Protect Region of Nihewan,Yangyuan,Hebei 075000,China)  
The Nihewan Basin is located at northeast end of the Fen-Wei rift valley system,and constitutes an important part of it.At the beginning of Eogene an upwelling plume of soft mantle was developed in Hengshan-Datong region.It caused thinning of the crust and magma eruption.During 25~24 Ma the crust began to subside along Yangyuan-Shixia area to form a basin,with an extensional orogen on its northern side.The compressional stress caused by shortening of the crust in the basin lead to the formation of terrace along its south side.The subsidence of the basin reached its acme during the terminal Pliocene to early Pleistocene when the Nihewan paleo-lake formed.During 2.0~0.8 Ma,the Nihewan paleolake saw a temperate climate intercalated with some subtropic intervals.The volcanic eruption and eolion deposits provided plentiful mineral nutrients necessary for living of animals and plants around the basin.These in turn offered the necessary living condition for early ancient humen.The Nihewan basin is a potential area to find the early ancient humen fossils.
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