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《Chinese Journal of Geophysics》 2015-02
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Study on the conductivity structure of the upper mantle and transition zone beneath North China

XU Guang-Jing;TANG Ji;HUANG Qing-Hua;UYESHIMA Makoto;Department of Geophysics,School of Earth and Space Sciences,Peking University;Institute of Geology,China Earthquake Administration;Earthquake Research Institute,The University of Tokyo;  
In order to reveal the deep geodynamics of the North China,14 geomagnetic stations with long-period observation data in North China were used to obtain the electrical structure under the lithosphere,especially between the mantle transition zone.Remote reference method and robust estimation were conducted to obtain the high quality data(the data coherencies are higher than 0.8).The Geomagnetic Deep Sounding(GDS)response of the periods 105~107seconds was obtained and transformed into an equivalent scalar magnetotelluric(MT)transfer function.+ρtheory was conducted to check the consistency of the apparent resistivity and phase.The smooth conductivity models of Occam inversion were obtained and compared with the past models.The real and imaginary parts of tipper were also analyzed.The+ρinversion indicates that conductivity discontinuity surfaces exist at depth about417 km and 850 km.Occam inversion shows that electrical conductivities in the eastern part aremuch higher than those of the western part in North China.The real and imaginary parts of tipper reveal that a high conductivity object along nearly north to south direction exists in the eastern part of North China.The conductivity of the mantle transition zone in the east and west of the North China are different.The conductivities of the mantle transition zone near the Ordos in the west of North China are similar as that of Tucson in the North America,while the conductivities of the east part are approximately 2~5times higher.This feature may correspond to the subduction of the Pacific plate.
【Fund】: 国家杰出青年科学基金(41025014);; 国家自然科学基金(40974041)资助
【CateGory Index】: P631.325
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