青藏高原北部巴颜喀拉构造带基底隆起的地震学证据
|
摘要
过去曾笼统地认为巴颜喀拉构造带上万米的堆积主要是三叠系的复理石沉积。通过对沱沱河-格尔木深地震剖面资料的再认识发现,巴颜喀拉构造带的结晶基底埋深仅5km左右,比金沙江断裂带以南的羌塘地块北缘和昆仑山南缘的基底埋藏深度都要浅。进一步对青藏公路以东横穿巴颜喀拉构造带的几条深地震测深剖面进行分析,发现该基底隆起一直顺构造走向延伸,向东贯穿了整个构造带,推测它是扬子古陆块的残余。
In the past it is generally thought that the up to 10000 m thick deposits in the Bayan Har tectonic belt are mainly Triassic flysch deposits. A further study of the data from the Tuotuo River-Golmud deep seismic profile reveals that the burial depth of the crystalline basement of the Bayan Har tectonic belt is only ～ 5 km, shallower than that of the basement of the northern margin of the Qiangtang and the southern margin of the Kunlun Mountains south of the Jinsha River fault. In combination of several deep seismic sounding profiles traversing the Bayan Har tectonic belt east of the Qinghai-Tibet Highway, it is found that the basement uplift might extend along the tectonic strike and eastward go through the whole tectonic belt. It is inferred that it represents remains of a ancient continental block.
In the past it is generally thought that the up to 10000 m thick deposits in the Bayan Har tectonic belt are mainly Triassic flysch deposits. A further study of the data from the Tuotuo River-Golmud deep seismic profile reveals that the burial depth of the crystalline basement of the Bayan Har tectonic belt is only ～ 5 km, shallower than that of the basement of the northern margin of the Qiangtang and the southern margin of the Kunlun Mountains south of the Jinsha River fault. In combination of several deep seismic sounding profiles traversing the Bayan Har tectonic belt east of the Qinghai-Tibet Highway, it is found that the basement uplift might extend along the tectonic strike and eastward go through the whole tectonic belt. It is inferred that it represents remains of a ancient continental block.
引文
[1]许志琴,杨经绥,陈方远.阿尼玛卿缝合带及“俯冲—碰撞”动力学[A].见:张旗主编.蛇绿岩与地球动力学研究[C].北京:地质出版社,1996.185～189.
[2]任纪瞬,王作勋,陈炳蔚,等.中国及邻区大地构造图[M].北京:地质出版社,1997.
[3]LiCY,WangQ,LiuX,etal.ExplanatoryNotestotheTectonicMapofAsia[M].CatographicPublishingHouse,Beijing,1982.
[4]MolnarP,BurchfielBC,ZhaoZ,etal.GeologicEvolu-tionofNorthernTibet:ResultsofanexpeditiontoUlughMuztagh[J].Science,1987,23:299～305.
[5]BurchfielBC,MolnarP,ZhaoZ,etal.GeologyoftheUlughMuztagharea,northernTibet[J].EarthPlanet.Sci.Lett.,1989,94:57～70.
[6]DeweyJF,ShackeltonRM,ChangC,etal.ThetectonicevolutionoftheTibetanPlateau[J].Phil.Trans.R.Soc.Lond.,1988,A327:379～413.
[7]DengW.TheophiolitesofthegeotraversersfromYechengtoShiquanhe[A].In:PanYushenged.GeologicalEvolutionoftheKarakorumandKunlunMountains[C].SeismologicalPress,Beijing,1996.51～93.
[8]PanY.Regionalgeologicevolutionandconclusion[A].In:PanYushenged.GeologicEvolutionoftheKarakorumandKunlunMountains[C].SeismologicalPress,Beijing,1996.263～288.
[9]李廷栋,肖序常.青藏高原地体构造分析[A].见:中国地质科学院岩石圈研究中心、地质矿产部地质研究所著.地质专报五:构造地质地质力学第20号,亚东—格尔木岩石圈地学断面综合研究——青藏高原岩石圈结构构造和形成演化[C].北京:地质出版社,1996.6～20.
[10]AnYin,MarkHarrisonT.GeologicEvolutionoftheHi-malayan-TibetanOrogen[J].Annu.EarthPlanet.Sci.,2000,28:211～80.
[11]RaoR,XuJ,ChenY,etal.TheTriassicSystemoftheQinghai-XizangPlateau[M].GeologicalPublishingHouse,Beijing,1987.
[12]QinghaiBGMR(QinghaiBureauofGeologyandMineralResources).RegionalGeologyofQinghaiProvince[M].Ge-ologicalPublishingHouse,Beijing,1991.
[13]GuXX.GeochemicalcharacteristicsoftheTriassicTethys-turbiditesinnorthwesternSichuan,China:Implicationsforprovenanceandinterpretationofthetectonicsetting[J].Geochim.Cosmochim.Acta,1994,58:4615～4631.
[14]NieS,YinA,RowleyD,etal.ExhumationoftheDabieshanultra-highpressurerocksandaccumulationoftheSongpan-Ganziflyschsequence,centralChina[J].Geology,1994,22:999～1002.
[15]崔作舟,陈纪平,吴苓.花石峡—邵阳深部地壳的结构和构造[M].北京:地质出版社,1996.
[16]SengorAMC.TheCimmeridesOrogenicSystemandtheTectonicofEurasia[M].geol.Soc.Amer.,spec.paper,1984.198.
[17]陈炳蔚,王恺元,刘万熹,等.怒江—澜沧江—金沙江地区大地构造[M].北京:地质出版社,1987.
[18]卢德源,陈纪平.青藏高原北部沱沱河—格尔木一带地壳深部结构[J].地质论评,1987,33(2):122～128.
[19]卢德源,王香泾.青藏高原北部沱沱河—格尔木地区的地壳结构和深部作用过程[J].中国地质科学院院报,1990,21:227～237.
[20]孟令顺.地壳的重力构造[A].见:中国地质科学院岩石圈中心、地质矿产部地质研究所著.青藏高原岩石圈结构构造与形成演化[C].北京:地质出版社,1996.83～93.
[21]钱辉,姜枚,薛光琦,等.天然地震接收函数揭示的青藏高原东部地壳结构[J].地震学报,2001,231:103～108.
[22]XUEGuangqi,QIANHui,JIANGMei.StudiesontheVe-locityStructureofCrust-UpperMantleBeneathQinghai-TibtetPlateauUsingseismicTomography[J].ContinentalDy-namics,1999,4(2):79～85.
[23]王有学,钱辉.青海东部地壳速度结构特征研究[J].地学前缘,2000,7(4):568～579.
[24]王椿镛,韩渭宾,吴建平,等.松潘-甘孜造山带地壳速度结构[J].地震学报,2003,253:229～241.
[2]任纪瞬,王作勋,陈炳蔚,等.中国及邻区大地构造图[M].北京:地质出版社,1997.
[3]LiCY,WangQ,LiuX,etal.ExplanatoryNotestotheTectonicMapofAsia[M].CatographicPublishingHouse,Beijing,1982.
[4]MolnarP,BurchfielBC,ZhaoZ,etal.GeologicEvolu-tionofNorthernTibet:ResultsofanexpeditiontoUlughMuztagh[J].Science,1987,23:299～305.
[5]BurchfielBC,MolnarP,ZhaoZ,etal.GeologyoftheUlughMuztagharea,northernTibet[J].EarthPlanet.Sci.Lett.,1989,94:57～70.
[6]DeweyJF,ShackeltonRM,ChangC,etal.ThetectonicevolutionoftheTibetanPlateau[J].Phil.Trans.R.Soc.Lond.,1988,A327:379～413.
[7]DengW.TheophiolitesofthegeotraversersfromYechengtoShiquanhe[A].In:PanYushenged.GeologicalEvolutionoftheKarakorumandKunlunMountains[C].SeismologicalPress,Beijing,1996.51～93.
[8]PanY.Regionalgeologicevolutionandconclusion[A].In:PanYushenged.GeologicEvolutionoftheKarakorumandKunlunMountains[C].SeismologicalPress,Beijing,1996.263～288.
[9]李廷栋,肖序常.青藏高原地体构造分析[A].见:中国地质科学院岩石圈研究中心、地质矿产部地质研究所著.地质专报五:构造地质地质力学第20号,亚东—格尔木岩石圈地学断面综合研究——青藏高原岩石圈结构构造和形成演化[C].北京:地质出版社,1996.6～20.
[10]AnYin,MarkHarrisonT.GeologicEvolutionoftheHi-malayan-TibetanOrogen[J].Annu.EarthPlanet.Sci.,2000,28:211～80.
[11]RaoR,XuJ,ChenY,etal.TheTriassicSystemoftheQinghai-XizangPlateau[M].GeologicalPublishingHouse,Beijing,1987.
[12]QinghaiBGMR(QinghaiBureauofGeologyandMineralResources).RegionalGeologyofQinghaiProvince[M].Ge-ologicalPublishingHouse,Beijing,1991.
[13]GuXX.GeochemicalcharacteristicsoftheTriassicTethys-turbiditesinnorthwesternSichuan,China:Implicationsforprovenanceandinterpretationofthetectonicsetting[J].Geochim.Cosmochim.Acta,1994,58:4615～4631.
[14]NieS,YinA,RowleyD,etal.ExhumationoftheDabieshanultra-highpressurerocksandaccumulationoftheSongpan-Ganziflyschsequence,centralChina[J].Geology,1994,22:999～1002.
[15]崔作舟,陈纪平,吴苓.花石峡—邵阳深部地壳的结构和构造[M].北京:地质出版社,1996.
[16]SengorAMC.TheCimmeridesOrogenicSystemandtheTectonicofEurasia[M].geol.Soc.Amer.,spec.paper,1984.198.
[17]陈炳蔚,王恺元,刘万熹,等.怒江—澜沧江—金沙江地区大地构造[M].北京:地质出版社,1987.
[18]卢德源,陈纪平.青藏高原北部沱沱河—格尔木一带地壳深部结构[J].地质论评,1987,33(2):122～128.
[19]卢德源,王香泾.青藏高原北部沱沱河—格尔木地区的地壳结构和深部作用过程[J].中国地质科学院院报,1990,21:227～237.
[20]孟令顺.地壳的重力构造[A].见:中国地质科学院岩石圈中心、地质矿产部地质研究所著.青藏高原岩石圈结构构造与形成演化[C].北京:地质出版社,1996.83～93.
[21]钱辉,姜枚,薛光琦,等.天然地震接收函数揭示的青藏高原东部地壳结构[J].地震学报,2001,231:103～108.
[22]XUEGuangqi,QIANHui,JIANGMei.StudiesontheVe-locityStructureofCrust-UpperMantleBeneathQinghai-TibtetPlateauUsingseismicTomography[J].ContinentalDy-namics,1999,4(2):79～85.
[23]王有学,钱辉.青海东部地壳速度结构特征研究[J].地学前缘,2000,7(4):568～579.
[24]王椿镛,韩渭宾,吴建平,等.松潘-甘孜造山带地壳速度结构[J].地震学报,2003,253:229～241.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心