念青唐古拉山深部构造特征研究
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摘要
本文利用INDEPTH项目深反射地震资料和大地电磁测深资料对念青唐古拉山地壳构造特征进行了深入细致的研究,通过对深反射地震资料的地震相分析及与大地电磁资料的比较得到:①16~22km深度的部分熔融体是多个不连通的独立的穹隆;②在羊八井—当雄北地区,深45~58km以下的下地壳深度存在NE走向的向形构造,该向形构造向北延伸、逐渐变深;③当雄北20km附近,中下地壳在深29~58km范围内存在大型的正断层,断距达6km。
Using the deep reflection seismic data and MT data of the INDEPTH project, the authors studied in detail the crustal structure. Through the seismic phase analysis of the deep reflection seismic data in comparison with the MT data, the following conclusions have been reached:① The partially melted bodies are several independent domes 15～25 km under the Nyainqentanglha Mountains;② There is a rock body at the depth of 42～54 km in the lower crust, which looks like a NE-striking anticline that stretches northward and becomes increasingly deeper in that direction;③ In the place 20 km north of Dangxiong City, there exists a large fault at the depth of 27～54 km in the middle crust, with the fault displacement as long as 6 km.
Using the deep reflection seismic data and MT data of the INDEPTH project, the authors studied in detail the crustal structure. Through the seismic phase analysis of the deep reflection seismic data in comparison with the MT data, the following conclusions have been reached:① The partially melted bodies are several independent domes 15～25 km under the Nyainqentanglha Mountains;② There is a rock body at the depth of 42～54 km in the lower crust, which looks like a NE-striking anticline that stretches northward and becomes increasingly deeper in that direction;③ In the place 20 km north of Dangxiong City, there exists a large fault at the depth of 27～54 km in the middle crust, with the fault displacement as long as 6 km.
引文
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MakovskyY,KlempererSL,RatschbacherLetal.1996.INDEPTHwide-anglereflectionobservationofP-waveconversionfromcrustalbrightspotsinTibet.Science,274(6):1690~1691.
NelsonKD,ZhaoWenjin,BrownLDetal.1996.PartiallymoltenmiddlecrustbeneathSouthernTibet:SynthesisofProjectIN-DEPTHresults.Science,274(6):1684~1688.
ShiYaolin,WangQiyu.1997.ThermalmodelingoftheformationofleucogranitesinthehigherHimalaya.ActaGeophysicaSinica,40(5):667~676(inChinesewithEnglishabstract).
TanHandong,ChenLeshou,WeiWenboetal.1997.Electricalstruc-tureofYaluzangbusuturefromprojectINDEPTH-MT.Geo-science,11(3):375~378(inChinesewithEnglishabstract).
WeiWenbo,ChenLeshou,TanHandongetal.1997.MTsoundingonTibetanplateau.Geoscience,11(3):366~374(inChinesewithEnglishabstract).
ZhaoWenjin,NelsonKDandProjectINDEPTHTeam.1993.DeepseismicreflectionevidenceforcontinentalunderthrustingbeneathsouthernTibet.Nature,366:557~559.
ZhaoWenjin,NelsonKD.1996.DeepseismicreflectionevidenceforcontinentalunderthrustingbeneathSouthernTibet.ActaGeoscien-ticaSinica,17(2):131~137(inChinesewithEnglishabstract).
ZhaoWenjin,NelsonKD,MeissnerR.1997a.AdvancesofIN-DEPTH-AdeepprofilingstudyinTibetandtheHimalayas.Episodes,20(4):266~272.
ZhaoWenjin,MechieJ,GuoJunetal.1997b.SeismicmappingofcrustalstructuresbeneaththeIndus-Yarlungsuture,Tibet.TerraNova,9(1):42~46.
ZhaoWenjin&ProjectINDEPTHTeam.2001.StudyingonthedeepstructurebeneathHimalayaandYaluzangbusuture.Beijing:Geo-logicalPublishingHouse(inChinese).
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石耀霖,王其允.1997.高喜马拉雅淡色花岗岩形成的热模拟.地球物理学报,40(5):667~676.
谭捍东,陈乐寿,魏文博等.1997.从INDEPTH结果探讨雅鲁藏布江缝合带的电性结构.现代地质,11(3):375~378.
魏文博,陈乐寿,谭捍东等.1997.西藏高原大地电磁深探测.现代地质,11(3):366~374.
赵文津及INDEPTH项目组.2001.喜马拉雅山及雅鲁藏布江缝合带深部结构与构造研究.北京:地质出版社.
赵文津,薛光琦,赵逊等.2004.INDEPTH-III地震层析成像———藏北印度岩石圈俯冲断落的证据.地球学报,25(1):1~10.
赵文津,NelsonKD.1996.印度板块俯冲到藏南之下的深反射证据.地球学报,17(2):131~137.
BrownLD,ZhaoWenjin,NelsonKDetal.1996.Brightspots,structure,andmagmatisminsouthernTibetfromINDEPTHseis-micreflectionprofiling.Science,274(6):1688~1690.
LiuQisheng,WuZhenhan,HuDaogongetal.2004.ShrimpU-Pbzir-condatingonNyainqentanglhagraniteincentralLhasablock.Chi-neseScienceBulletin,49(1):76~82(inChinesewithEnglishab-stract).
MakovskyY,KlempererSL,HuangLiyanetal.1996.Structuralele-mentsofthesouthernTethyanHimalayacrustfromwide-angleseismicdata.ActaGeoscienticaSinica,17(2):153~161(inChi-nesewithEnglishabstract).
MakovskyY,KlempererSL,RatschbacherLetal.1996.INDEPTHwide-anglereflectionobservationofP-waveconversionfromcrustalbrightspotsinTibet.Science,274(6):1690~1691.
NelsonKD,ZhaoWenjin,BrownLDetal.1996.PartiallymoltenmiddlecrustbeneathSouthernTibet:SynthesisofProjectIN-DEPTHresults.Science,274(6):1684~1688.
ShiYaolin,WangQiyu.1997.ThermalmodelingoftheformationofleucogranitesinthehigherHimalaya.ActaGeophysicaSinica,40(5):667~676(inChinesewithEnglishabstract).
TanHandong,ChenLeshou,WeiWenboetal.1997.Electricalstruc-tureofYaluzangbusuturefromprojectINDEPTH-MT.Geo-science,11(3):375~378(inChinesewithEnglishabstract).
WeiWenbo,ChenLeshou,TanHandongetal.1997.MTsoundingonTibetanplateau.Geoscience,11(3):366~374(inChinesewithEnglishabstract).
ZhaoWenjin,NelsonKDandProjectINDEPTHTeam.1993.DeepseismicreflectionevidenceforcontinentalunderthrustingbeneathsouthernTibet.Nature,366:557~559.
ZhaoWenjin,NelsonKD.1996.DeepseismicreflectionevidenceforcontinentalunderthrustingbeneathSouthernTibet.ActaGeoscien-ticaSinica,17(2):131~137(inChinesewithEnglishabstract).
ZhaoWenjin,NelsonKD,MeissnerR.1997a.AdvancesofIN-DEPTH-AdeepprofilingstudyinTibetandtheHimalayas.Episodes,20(4):266~272.
ZhaoWenjin,MechieJ,GuoJunetal.1997b.SeismicmappingofcrustalstructuresbeneaththeIndus-Yarlungsuture,Tibet.TerraNova,9(1):42~46.
ZhaoWenjin&ProjectINDEPTHTeam.2001.StudyingonthedeepstructurebeneathHimalayaandYaluzangbusuture.Beijing:Geo-logicalPublishingHouse(inChinese).
ZhaoWenjin,XueGuangqi,ZhaoXunetal.2004.SeismicimagingofthesubductingIndianlithospherebeneathNorthTibet.ActaGeo-scienticaSinica,25(1):1~10(inChinesewithEnglishabstract).
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