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New 40Ar/39Ar dating results from the shanwang Basin,eastern China:Constraints on the age of the shanwang formation and associated biota

New 40Ar/39Ar dating results from the Shanwang Basin,eastern...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Huaiyu He~(a,*),Chenglong Deng~b,Yongxin Pan~a,Tao Deng~c,Zhaohua Luo~d,Jimin Sunb,Rixiang Zhu~b a Key Laboratory of the Earth’s Deep Interior,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China c Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China d China University of Geosciences,Beijing 100083,China

The fluvio-lacustrine sequence of the shanwang Basin,eastern China,preserves a rich and important terrestrial fossil fauna and flora;the exceptional preservation of these fossils reveals the dynamics of ancient mammalian ecosystems and plant ***,the timing of this sedimentary sequence has been the subject of debate for *** we contribute to this debate by presenting the detailed results of Ar/Ar analysis of the basalts above,below,and within the shanwang *** dates place stringent constraints on the age of shanwang formation and associated ***/Ar ages obtained from basalts of the Niushan and Yaoshan formations,which underlie and overlie the shanwang formation, are 21.0±2.5 Ma(2σ,full external error) and 17.3±1.5 Ma(2σ,full external error),respectively. The Ar/Ar age of the basalt in the shanwang formation is 17-18 *** the age constraints of the basalts of the Yaoshan and shanwang formations,the age of the shanwang biota is estimated to be ca.17 Ma,late Burdigalian of the Early Miocene,indicating that the deposition of this fauna coincided with the onset of the mid-Miocene Climatic *** results provide new age constraints on the shanwang mammal fauna,and independently support interpretations that this fauna can be assigned to chronozone MN4,and correlated with middle Orleanian of the European Land Mammal *** to late Hemingfordian of the North American Land Mammal *** diversity of the shanwang formation could reflect the global-scale mid-Miocene Climatic Optimum.

关键词： 40Ar/39Ar dating Geochronology shanwang formation shanwang biota Miocene

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