应用接收函数方法研究海南及其邻区地幔转换带结构
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摘要
利用海南、广东及广西区域台网和国家台网共88个宽频带地震台站记录的2007年8月至2010年3月75个远震事件波形资料,采用接收函数共面元叠加的方法,得到了海南及其邻区上地幔410km和660km间断面结构和转换带厚度.结果表明,研究区410km间断面形态较复杂,局部下沉到447km,而660km间断面相对简单,其深度分布在670km左右.海南岛东北部存在一个直径约200km的转换带异常薄的区域,其厚度较全球平均值薄25±5km,相当于转换带中存在约180℃的高温异常,转换带厚度局部偏薄暗示海南地幔柱可能起源于下地幔.
We have obtained the upper mantle 410 km discontinuity and 660-km discontinuity structure and transition zone thickness around Hainan by using receiver function method.The data used in this study was teleseismic waveforms recorded by 88 seismic stations of Hainan,Guangdong and Guangxi Regional Seismic Network and National Seismic Network during August,2007 to March,2010.Our results show that the structure of 410 km discontinuity is complex in this region,it is depressed to 447 km locally.The 660 km discontinuity is simple relatively,with the depth around 670km.Transition zone is thinned anomalously by 25±5km within an area approximately 200km in diameter centered northeast of Hainan island,this anomaly is consistent with an excess temperature of ～180℃.The locally thinned transition zone implies that Hainan plume originates from lower mantle.
We have obtained the upper mantle 410 km discontinuity and 660-km discontinuity structure and transition zone thickness around Hainan by using receiver function method.The data used in this study was teleseismic waveforms recorded by 88 seismic stations of Hainan,Guangdong and Guangxi Regional Seismic Network and National Seismic Network during August,2007 to March,2010.Our results show that the structure of 410 km discontinuity is complex in this region,it is depressed to 447 km locally.The 660 km discontinuity is simple relatively,with the depth around 670km.Transition zone is thinned anomalously by 25±5km within an area approximately 200km in diameter centered northeast of Hainan island,this anomaly is consistent with an excess temperature of ～180℃.The locally thinned transition zone implies that Hainan plume originates from lower mantle.
引文
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[26]Zhao D P,Liu L.Deep structure and origin of activevolcanoes in China.Geoseience Frontiers,2010,1(1):31-44.
[27]Tan E,Gurnis M,Han LJ.Slabs in the lower mantle andtheir modulation of plume formation.Geochem.Geophys.Geosyst.,2002,3(11),1067,doi:10.1029/2001GC000238.
[28]郑秀芬,欧阳飚,张东宁等."国家数字测震台网数据备份中心"技术系统建设及其对汶川大地震研究的数据支撑.地球物理学报,2009,52(5):1412-1417.Zhen X F,Ouyang B,Zhang D N,et al.Technical systemconstruction of Data Backup Centre for China SeismographNetwork and the data support to researches on the Wenchuanearthquake.Chinese J.Geophys.(in Chinese),2009,52(5):1412-1417.
[2]Maruyama S.Plume tectonics.J.Geol.Soc.Japan,1994,100(1):24-49.
[3]Lebedev S,Nolet G.Upper mantle beneath Southeast Asiafrom S velocity tomography.J.Geophys.Res.,2003,108(B1):2048.
[4]Montelli R,Nolet G,Masters G,et al.Finite-frequencyTomography reveals a variety of plumes in the mantle.Science,2004,303(5656):338-343.
[5]Montelli R,Nolet G,Dahlen F A,et al.A catalogue of deepmantle plumes:New results from finite-frequency tomography.Geochem.Geophys.Geosyst.,2006,7:Q11007,doi:10.1029/2006GC001248.
[6]Huang J L,Zhao D P.High-resolution mantle tomography ofChina and surrounding regions.J.Geophys.Res.,2006,111:B09305,doi:10.1029/2005JB004066.
[7]Lei J S,Zhao D P,Steinberger B,et al.New seismicconstraints on the upper mantle structure of the Hainanplume.Phys.Earth Planet.Int.,2008,173(1-2):33-50,doi:10.1016/j.pepi.2008.10.013.
[8]Shen Y,Solomon S C,Bjarnasonet I T,et al.Seismicevidence for a lower-mantle origin of the Iceland plume.Nature,1998,395(6697):62-65.
[9]Niu F L,Solomon S C,Silver P G,et al.Mantle transition-zone structure beneath the South Pacific Superswell andevidence for a mantle plume underlying the Society hotspot.Earth Planet.Sci.Lett.,2002,198(3-4):371-380.
[10]Li X Q,Kind R,Priestley K,et al.Mapping the Hawaiianplume conduit with converted seismic waves.Nature,2000,405(6789):938-941.
[11]Li X Q,Kind R,Yuna X H.Seismic study of upper mantleand transition zone beneath hotspots.Phys.Earth Planet.Int.,2003,136(1-2):79-92.
[12]Hooft E E E,Toomey D R,Solomon S C.Anomalously thintransition zone beneath the Galápagos hotspot.EarthPlanet.Sci.Lett.,2003,216(1-2):55-64.
[13]Huerta A D,Nyblade A A,Reusch A M.Mantle transitionzone structure beneath Kenya and Tanzania:more evidencefor a deep-seated thermal upwelling in the mantle.Geophys.J.Int.,2009,177(3):1249-1255.
[14]杨毅,周蕙兰.用接收函数方法研究中国及邻区上地幔间断面的埋藏深度.地球物理学报,2001,44(6):783-792.Yang Y,Zhou H L.Application of receiver function methodto estimate the buried depths of discontinuities in the uppermantle beneath China and adjacent area.Chinese J.Geophys.(in Chinese),2001,44(6):783-792.
[15]Lebedev S,Chevrot S,van der Hilst R D.Seismic evidencefor olivine phase changes at the 410-and 660-kilometerdiscontinuities.Science,2002,296(5571):1300-1302.
[16]Langston C A.Structure under Mount Rainier,Washington,inferred from teleseismic body waves.J.Geophys.Res.,1979,84(B9):4749-4762.
[17]Ammon C J.The isolation of receiver effects from teleseismicP waveforms.Bulletin of the Seismological Society ofAmerica,1991,81(6):2504-2510.
[18]Shen Y,Sheehan A F,Dueker K G,et al.Mantlediscontinuity structure beneath the southern East Pacific Risefrom P-to-S converted phases.Science,1998,280(5367):1232-1235.
[19]徐强,赵俊猛.接收函数方法的研究综述.地球物理学进展,2008,23(6):1709-1716.Xu Q,Zhao J M.A review of the receiver function method.Progress in Geophysics(in Chinese),2008,23(6):1709-1716.
[20]Bina C R,Helffrich G.Phase transition Clapeyron slopes andtransition zone seismic discontinuity topography.J.Geophys.Res.,1994,99(B8):15853-15860.
[21]Courtillot V,Davaille A,Besse J,et al.Three distinct typesof hotspots in the Earth′s mantle.Earth Planet.Sci.Lett.,2003,205(3-4):295-308.
[22]Anderson D L.The thermal state of the upper mantle:norole for mantle plumes.Geophys.Res.Lett.,2000,27(22):3623-3626.
[23]Olson P,Schubert G,Anderson C.Plume formation in theD″-layer and the roughness of the core-mantle boundary.Nature,1987,327(6121):409-413.
[24]Olson P,Schubert G,Anderson C,et al.Plume formationand lithosphere erosion:A comparison of laboratory andnumerical experiments.J.Geophys.Res.,1988,93(B12):15065-15084.
[25]朱炳泉,王慧芬.雷琼地区MORB-OIB过渡型地幔源火山作用的Nd-Sr-Pb同位素证据.地球化学,1989,(3):193-201.Zhu B Q,Wang H F.Nd-Sr-Pb isotopic and chemicalevidence for the volcanism with MORB-OIB sourcecharacteristics in the Leiqiong area,China.Geochimica(inChinese),1989,(3):193-201.
[26]Zhao D P,Liu L.Deep structure and origin of activevolcanoes in China.Geoseience Frontiers,2010,1(1):31-44.
[27]Tan E,Gurnis M,Han LJ.Slabs in the lower mantle andtheir modulation of plume formation.Geochem.Geophys.Geosyst.,2002,3(11),1067,doi:10.1029/2001GC000238.
[28]郑秀芬,欧阳飚,张东宁等."国家数字测震台网数据备份中心"技术系统建设及其对汶川大地震研究的数据支撑.地球物理学报,2009,52(5):1412-1417.Zhen X F,Ouyang B,Zhang D N,et al.Technical systemconstruction of Data Backup Centre for China SeismographNetwork and the data support to researches on the Wenchuanearthquake.Chinese J.Geophys.(in Chinese),2009,52(5):1412-1417.
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