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《Quaternary Sciences》 2008-05
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PALEOMAGNETIC CHRONOLOGY OF QUATERNARY STRATIGRAPHY OF THE LONGDAN SECTION IN GANSU PROVINCE OF CHINA

Liu Ping Zhang Song Han Jiamao Liu Tungsheng(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029)  
Linxia Basin,situated in the northeast belt of the Tibetan Plateau,is a Late Cenozoic depression basin bounded by the Tibetan Plateau and the Chinese Loess Plateau.The Longdan section(35°31'31.6″N,103°29'0.6″E)lies on the east slope of Longdan,a small village of township Nalesi in the south of the Dongxiang Autonomous County,Linxia Hui Nationality Autonomous Prefecture.The Longdan mammal fauna was discovered at the base of the Early Pleistocene loess deposits at Dongxiang,where the lithology is different from the typical Wucheng Loess on the Chinese Loess Plateau.The rich fossils contain many new species and the major two layers of fossils are in the loess beds.Geologically the fossiliferous area is located in the central part of the Linxia Cenozoic sedimentary basin.Tectonically it is an intermountain fault basin,bordered by the Leijishan major fault in the south and the north Qinling and Qilianshan major faults in the north.The section is 51.6m thick above the gravel layer,including the 1.6m Late Pleistocene Malan Loess on the top and the other loess-paleo~sol sequences in the middle of the section.The base of the section is the Jishi Formation,consisting of gravel layer of 13~17m thick.In this study,972 bulk samples were collected with an interval of 5cm and other 401 oriented samples were taken with a magnetic compass.In the laboratory,the paleo~magnetism,medium grain size and the susceptibility of the loess-paleo~sol in the Longdan section were analyzed.From the stratigraphic analysis,the Longdan section from the top 0.3m to the bottom 51.6m,containing 5 normal polarities(N1~N5)and 5 reversal polarities(R1~R5).The paleo~magnetic results show N3 is the Olduvai subchron in the middle of the Matuyama chron,and then the chronology of the Longdan mammal fauna is constructed along the section.The Olduvai subchron with the age of 1.77~1.95Ma is found just in the upper fossiliferous level of Longdan mammal fauna.The geological age of the upper fossiliferous level of Longdan mammal fauna is estimated to be about 1.9Ma.The lower fossiliferous level is below the Reunion subchron and its age is estimated to be 2.25Ma.
【Fund】: 2003年度刘东生国家最高科学技术奖专项项目资助
【CateGory Index】: P318.44
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