新疆富蕴—库尔勒剖面地震层析图像与地壳上地幔的速度结构
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摘要
利用在2002~2004年新疆天山地区富蕴—库尔勒布设的流动地震台,经过连续两年的观测所采集的数据,挑选远震P波到时数据,进行了地震层析反演处理,获得此剖面地震层析图像推断地壳上地幔的速度结构。反演结果表明,富蕴—库尔勒剖面上塔里木板块向北的推进相对于西部有所减弱,在西部表现强烈的造山作用,向东逐步减缓,在天山的底部不过100km上下。地震活动集中在此范围内。岩石圈物质移动方向发生变化部分向东推移,自然也降低了天山的隆升作用,从而造成天山西段和东段的差异。在本剖面范围内天山的Moho面结构复杂有重叠、斜插特征,深度最大在天山地区达80km,准噶尔盆地和本剖面范围内塔里木盆地北部Moho面深度为40~50km。
From two years seismic data continuously recorded by stations directly set up from Fuyun to Kuerle, P_arrival times were picked and image of crust and upper mantle structure was given with the technique of seismic tomography. The inversion shows that the extrusion to north of Tarim plate in this profile is more weaken than that in the west. The orogen effect is intense in the west and becomes weak gradually to east. Moreover, the depth of orogeny is less than about 100 km under Tianshan Moutain in this profile. The earthquake activity converged this range in depth. The part of lithosphere substance changed in the floating tendence was moved to east, which decreased the uplift activity of Tianshan Moutain. As a result, there is difference between the west and the east of Tianshan Mountain. Under the Tianshan Mountain in this profile, the structure of Moho is complicated with the characteristic of cross and overlap. The depth of Moho in the Tianshan Mountain area extends to 80 km, and the depth under Junggar basin and north part of Tarim basin is 40～50 km.
From two years seismic data continuously recorded by stations directly set up from Fuyun to Kuerle, P_arrival times were picked and image of crust and upper mantle structure was given with the technique of seismic tomography. The inversion shows that the extrusion to north of Tarim plate in this profile is more weaken than that in the west. The orogen effect is intense in the west and becomes weak gradually to east. Moreover, the depth of orogeny is less than about 100 km under Tianshan Moutain in this profile. The earthquake activity converged this range in depth. The part of lithosphere substance changed in the floating tendence was moved to east, which decreased the uplift activity of Tianshan Moutain. As a result, there is difference between the west and the east of Tianshan Mountain. Under the Tianshan Mountain in this profile, the structure of Moho is complicated with the characteristic of cross and overlap. The depth of Moho in the Tianshan Mountain area extends to 80 km, and the depth under Junggar basin and north part of Tarim basin is 40～50 km.
引文
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姜枚,许志琴,HirnA,刘妍,董英君,薛光琦,钱辉.2001.青藏高原及其部分邻区地震各向异性和上地幔特征.地球学报,22(2):111~116.
姜常义,姜寒冰,叶书锋,夏明哲,逯东霞.2005.新疆库鲁克塔格地区二叠纪脉岩群岩石地球化学特征,Nd、Sr、Pb同位素组成与岩石成因.地质学报,79(6):823~832.
卢德源,李秋生,高锐,李英康,李德兴,刘文,张之英.2000.横跨天山的人工爆破地震剖面.科学通报,45(9):982~987.
钱辉,宿和平,姜枚,等.2004.江苏东海大陆钻址区层析成像.地质学报,78(1).:139~144.
孙桂华,李锦铁,高立明,杨天南.2005.新疆东部哈尔里克山闪长岩锆石SHRIMPU_Pb定年及其地质意义.地质论评,51(4):463~469.
王有学,韩果花,姜枚,袁学诚.2004.阿尔泰—阿尔金地学断面地壳结构.地球物理学进展,47(2):240~249.
吴华,李华芹,莫新华,陈富文,路远发,梅玉萍,邓岗.2005.新疆哈密白石泉铜镍矿区基性-超基性岩的形成时代及其地质意义.地质学报,79(4):498~502.
魏素花,薛光琦,钱辉,姜枚,等.2000.新疆库车—克拉玛依地震层析成像.地球物理学进展,15(4):46~54.
AkiK,ChristofferssonA,HusebyeES.1977.Determinationofthethree-dimensionalseismicstructureofthelithosphere.J.Geophy.Res.,82(2):277~296.
DongYingjun,JiangMei,QianHui,XueGuangqi.2005.StudyofanisotropywithinlithosphereofwesternTibetanPlateau.ActaPetrologicaetMineralogica,24(5):418~424(inChinesewithEnglishabstract).
EvansJR,AchauerU.1993.TeleseismicvelocitytomographyusingtheACHmethod:theoryandapplicationtocontinental-scalestud-ies.In:IyerHM,HiraharaK,eds.SeimicTomography:TheoryandPractice,309~360.
Eberhart-PhillipsD.1993.Localearthquaketomography:earthquakesoureregions,inSeismicTomography.In:IyerHM,HiraharaK,eds.TheoryandPractice,ChapmanandHall,London,613~643.
GaoRui,XiaoXuchang,KaoHoon,LiuQiusheng,LiuXun,JiangMei,ShiDanian.2002.SummaryofdeepseismicprobingofthelithosphericstructureacrosstheWestKunlun—Tarim—Tianshan.GeologicalBulletinofChina,21(1):11~18(inChinesewithEng-lishabstract).
JiangMei,XueGuangqi,SuHeping,QianHui,WeiSuhua,DongYingjun.2000.Seisimicfeaturesofcrust-uppermantlebeneathKaramay-Kuqa,Xinjiang.ContinentalDynamics,5(1):25~33.
JiangMei,XuZhiqin,HirnA,LiuYan,DongYingjun,XueGuangqi,QianHui.2001.TeleseimicanisotropyandcorrespondingfeaturesoftheuppermantleinTibetPlateauanditsneighboringareas.ActaGeoscientiaSinica,22(2):111~116(inChinesewithEnglishab-stract).
LuDeyuan,LiQiusheng,GaoRui,LiYingkang,LiDexing,LiuWen,ZhangZhiying.2000.DynamiteseismicprofileacroosTianShanMountains.ChineseScienceBulletin,45(9):982~987(inChinesewithEnglishabstract).
QianHui,SuHeping,JiangMei.2004.TomographyintheChinesecon-tinentalScientificDrillingAreaofDonghaicounty,JiangsuProvince.ChinaActaGeologicaSinica,78(1):139~144(inChi-nesewithEnglishabstract).
WangYouxue,HanGuohua,JiangMei,YuanXuecheng,WalterDMooney,RobertGColeman.2004.Crustalstructurealongthegeosciencestransectfromaltaytoaltuntagh.ChineseJournalofGeophysics,47(2):240~249(inChinesewithEnglishabstract).
WeiSuhua,XueGuangqi,QianHui,JaingMei,PoupinetG,EdiKissiling.2000.XinjiangKuche-Kelamayiseismictomography.ProgressinGeophysics,15(4):46~54(inChinesewithEnglishabstract).
YuanXuecheng.1992.Mid-AsiaGeoscienceTransect.Abstractsof29thInternationalGeologicalCongress,2of3:478.
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