Crust and upper mantle structures beneath Northeast China from receiver function studies

查看全文 作　　者：Zhen [1]Guo;Yuliang [1]Cao;Xianguang [1]Wang;Y.John [1]Chen;Jieyuan [1]Ning;Weiguang [1]He;Youcai [2]Tang;Yongge [1]Feng

机构地区：[1]School of Earth and Space Sciences,Institute of Theoretical and Applied Geophysics (ITAG),Peking University;[2]State Key Laboratory of Petroleum Resource and Prospecting,and Unconventional Natural Gas Institute,China University of Petroleum

出　　处：《Earthquake Science》索引2014年第27卷第3期,共11页

摘　　要：P-wave and S-wave receiver function analyses have been performed along a profile consisted of 27broadband seismic stations to image the crustal and upper mantle discontinuities across Northeast China.The results show that the average Moho depth varies from about37 km beneath the Daxing'anling orogenic belt in the west to about 33 km beneath the Songliao Basin,and to about35 km beneath the Changbai mountain region in the east.Our results reveal that the Moho is generally flat beneath the Daxing'anling region and a remarkable Moho offset(about 4 km) exists beneath the basin-mountain boundary,the Daxing'anling-Taihang Gravity Line.Beneath the Tanlu faults zone,which seperates the Songliao Basin and Changbai region,the Moho is uplift and the crustal thickness changes rapidly.We interpret this feature as that the Tanlu faults might deeply penetrate into the upper mantle,and facilitate the mantle upwelling along the faults during the Cenozoic era.The average depth of the lithosphereasthenosphere boundary(LAB) is *80 km along the profile which is thinner than an average thickness of a continental lithosphere.The LAB shows an arc-like shape in the basin,with the shallowest part approximately beneath the center of the basin.The uplift LAB beneath the basin might be related to the extensive lithospheric stretching in theMesozoic.In the mantle transition zone,a structurally complicated 660 km discontinuity with a maximum 35 km depression beneath the Changbai region is observed.The35 km depression is roughly coincident with the location of the stagnant western pacific slab on top of the 660 km discontinuity revealed by the recent P wave tomography. 关键词：上地幔结构中国东北地区接收函数地壳大兴安岭地区郯庐断裂带不连续性松辽盆地

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Crust and upper mantle structures beneath Northeast China from receiver function studies

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