中国大陆科学钻探场址区的地壳速度结构特征
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摘要
为了深入研究大别—苏鲁超高压变质带的深部结构及空间展布特征 ,进一步揭示该超高压变质形成的动力学过程 ,在中国大陆科学钻探场址区进行了广角反射 /折射地震测深调查 .根据广角反射 /折射地震测深的资料研究 ,建立了中国大陆科学钻探场址区的地壳纵波速度结构 .从纵向上来看 ,研究区域的地壳结构可划分为上、中、下 3层 :上地壳的速度小于6 .2 0km/s,厚 10余km ;中地壳的速度为 6 .4 0km/s,厚亦为 10km左右 ;下地壳的速度为 6 .6 0km/s.地壳厚度为 31km左右 ,且其地壳的平均速度为 6 .30km/s.上地壳中的速度倒转指示了超高压变质体在地壳内部的空间分布 ,且超高压变质体在大陆科学钻探场址及其附近的下部呈现为一隆起形态
In order to study the deep structure, spatial tectonic characteristics and the dynamic process for the Dabie-Sulu ultral-high metamorphic belt, a wide-angle reflection/refraction seismic survey was conducted in the Chinese Continental Scientific Drilling (CCSD) site. The crustal velocity structure beneath the CCSD site has been established based on wide-angle seismic reflection/refraction data acquired at the site. According to the results, the crust beneath CCSD is composed of three layers: the upper, middle and lower crust, with velocities of <6.20 km/s, 6.40 km/s, and 6.60 km/s, and a thickness of ～10 km, ～10 km, and ～12 km respectively. The crust thickness is 31 km around with an average velocity of 6.30 km/s. However, the reversed velocity in the upper crust implies an ultrahigh-pressure metamorphic (UHPM) layer (body) with a shape of uplift beneath or near the CCSD site.
In order to study the deep structure, spatial tectonic characteristics and the dynamic process for the Dabie-Sulu ultral-high metamorphic belt, a wide-angle reflection/refraction seismic survey was conducted in the Chinese Continental Scientific Drilling (CCSD) site. The crustal velocity structure beneath the CCSD site has been established based on wide-angle seismic reflection/refraction data acquired at the site. According to the results, the crust beneath CCSD is composed of three layers: the upper, middle and lower crust, with velocities of <6.20 km/s, 6.40 km/s, and 6.60 km/s, and a thickness of ～10 km, ～10 km, and ～12 km respectively. The crust thickness is 31 km around with an average velocity of 6.30 km/s. However, the reversed velocity in the upper crust implies an ultrahigh-pressure metamorphic (UHPM) layer (body) with a shape of uplift beneath or near the CCSD site.
引文
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程裕淇,1994.中国区域地质概论.北京:地质出版社.丛柏林,王清晨,翟明国,1994.超高压变质作用:固体地球科学领域的新挑战.地球物理学进展,9(4):30-38.
欧新功,金振民,金淑燕,等,2003.江苏东海超高压榴辉岩的热导率及对大陆科学钻探研究的意义.地球科学———中国地质大学学报,28(2):129-136.
索书田,钟增球,周汉文,等,2003.大别—苏鲁超高压变质带内的块状榴辉岩及其构造意义.地球科学———中国地质大学学报,28(2):111-120.
王有学,2002.苏鲁—大别超高压变质带广角地震测深地壳结构研究.博士论文,北京:中国地质大学.
杨文采,程振炎,陈国九,等,1999a.苏鲁超高压变质带北部地球物理调查(Ⅰ)———深反射地震.地球物理学报,42(1):41-52.
杨文采,胡振远,程振炎,等,1999c.郯城-涟水综合地球物理剖面.地球物理学报,42(2):206-216.
杨文采,余长青,2001.根据地球物理资料分析大别苏鲁超高压变质带的运动学与动力学.地球物理学报,44(3):346-359.
杨文采,方慧,程振炎,等,1999b.苏鲁超高压变质带北部地球物理调查(Ⅱ)———非地震方法.地球物理学报,42(4):508-519.
余钦范,姚长利,孟小红,等,2001.苏北大陆科学钻探靶区重磁异常反演解释.地球物理学报,44(6):825-832.
余钦范,郭友钊,孟小红,等,2002.苏北大陆科学钻探靶区岩石物理性质.地球物理学报,45(1):93-100.
张儒媛,丛柏林,刘忠光,1993.苏鲁超高压变质地体及其成因解释.岩石学报,9(3):211-226.
张永康,1997.江苏东海———中国大陆科学钻探的最佳选区之一.江苏地质,21(3):129-137.
Cheng,Y .Q .,1994.RegionalgeologyinChina.GeologicalPu bilishingHouse,Beijing(inChinese).
Cong,B .L .,Wang,Q .C .,Zhai,M .G .,1994.Ultra highpres suremetamorphism:Newchallengeinsolidearthscience.ProgressinGeophysics,9(4):30-38(inChinesewithEnglishabstract).
Mooney,W .D .,1989.Seismicmethodsfordeterminingearth quakesource parametersandlithosphericstructure.In:Pakiser,L .C .,Mooney,W .D .,eds.,Geophysicalframe workofthecontinentalUnitedStates,Mem.Geol.Soc.Am.,172:11-34.
Ou,X .G .,Jin,Z .M .,Jin,S .Y .,etal.,2003.Thermalconduc tivityofDonghaiUHPeclogiteanditssignificanceforstudyingcontinentalscientificdrilling.EarthScience—JournalofChinaUniversityofGeosciences,28(2):129-136(inChinesewithEnglishabstract).
Suo,S .T .,Zhong,Z .Q .,Zhou,H .W .,etal.,2003.Massivee clogitesandtheirsignificanceinDabieUHPmetamorphicbelt,EastCentralChina.EarthScience—JournalofChi naUniversityofGeosciences,28(2):111-120(inChi nesewithEnglishabstract).
Wang,Y .X .,2002.Crustalstructureresearchusingwide angleseismicreflectioninSuluDabieultrahighpressuremeta morphicbelts:Ph.D .Thesis.ChinaUniversityofGeo sciences,Beijing(inChinese).
Xu,Z .Q .,1987.EtudetectoniqueetmicrotectoniquedelachainepaleozoiqueettriasiquedesQinlings(Chine).A cademiedeMontpellierUniversitedesSciencesetTech niquesduLanguedoc,93-107.
Yang,W .C .,1997.CrustalstructureanddevelopmentofSuluUHPMterraneinEastCentralChina.Episode,20(2):100-103.
Yang,W .C .,Cheng,Z .Y .,1998.Crustalstructureanddevel opmentoftheDabieUHPMterraneinEastCentralChi na.ContinentalDynamics,3:86-95.
Yang,W .C .,Cheng,Z .Y .,Chen,G .J .,etal.,1999a.Geo physicalinvestigationsinnorthernSuluUHPMbelt,PartⅠ:Deepseismicreflection.ChineseJournalofGeophysics,42(1):41-52(inChinesewithEnglishabstract).
Yang,W .C .,Fang,H .,Cheng,Z .Y .,etal.,1999b.Geophysi calinvestigationinnorthernSuluUHPMbelt,PartⅡ:Non seismicmethods.ChineseJournalofGeophysics,42(4):508-519(inChinesewithEnglishabstract).
Yang,W .C .,Hu,Z .Y .,Cheng,Z .Y .,etal.,1999c.Longpro fileofgeophysicalinvestigationfromTanchengtoLian shui,east centralChina.ChineseJournalofGeophysics,42(2):206-216(inChinesewithEnglishabstract).
Yang,W .C .,Yu,C .Q .,2001.Kineticsanddynamicsofdevel opmentoftheDabieSuluUHPMterranesbasedongeo physicalevidences.ChineseJournalofGeophysics,44(3):346-359(inChinesewithEnglishabstract).
Yu,Q .F .,Guo,Y .Z .,Meng,X .H .,2002.Petrophysicalpa rametersatcontinentalscientificdrillingsiteinSubei,Chi na.ChineseJournalofGeophysics,45(1):93-100(inChinesewithEnglishabstract).
Yu,Q .F .,Yao,C .L .,Meng,X .H .,etal.,2001.Interpreta tionofgravityandmagneticanomaliesobtainedatconti nentalscientificdrillingsiteinSubei.ChineseJournalofGeophysics,44(6):825-832(inChinesewithEnglishab stract).
Zhang,R .Y .,Cong,B .L .,Liu,Z .G .,1993.Suluultrahighpressuremetamorphicterraneandexplorationofitsorigin.ActaPetrologicaSinica,9(3):211-226(inChinesewithEnglishabstract)
Zhang,Y .K .,1997.Donghai,NorthJiangsu:OneofthebestsiteoptionsforthefirstcontinentalscientificdrillinginChina.JiangsuGeology,21(3):129-137(inChinesewithEnglishabstract).
程裕淇,1994.中国区域地质概论.北京:地质出版社.丛柏林,王清晨,翟明国,1994.超高压变质作用:固体地球科学领域的新挑战.地球物理学进展,9(4):30-38.
欧新功,金振民,金淑燕,等,2003.江苏东海超高压榴辉岩的热导率及对大陆科学钻探研究的意义.地球科学———中国地质大学学报,28(2):129-136.
索书田,钟增球,周汉文,等,2003.大别—苏鲁超高压变质带内的块状榴辉岩及其构造意义.地球科学———中国地质大学学报,28(2):111-120.
王有学,2002.苏鲁—大别超高压变质带广角地震测深地壳结构研究.博士论文,北京:中国地质大学.
杨文采,程振炎,陈国九,等,1999a.苏鲁超高压变质带北部地球物理调查(Ⅰ)———深反射地震.地球物理学报,42(1):41-52.
杨文采,胡振远,程振炎,等,1999c.郯城-涟水综合地球物理剖面.地球物理学报,42(2):206-216.
杨文采,余长青,2001.根据地球物理资料分析大别苏鲁超高压变质带的运动学与动力学.地球物理学报,44(3):346-359.
杨文采,方慧,程振炎,等,1999b.苏鲁超高压变质带北部地球物理调查(Ⅱ)———非地震方法.地球物理学报,42(4):508-519.
余钦范,姚长利,孟小红,等,2001.苏北大陆科学钻探靶区重磁异常反演解释.地球物理学报,44(6):825-832.
余钦范,郭友钊,孟小红,等,2002.苏北大陆科学钻探靶区岩石物理性质.地球物理学报,45(1):93-100.
张儒媛,丛柏林,刘忠光,1993.苏鲁超高压变质地体及其成因解释.岩石学报,9(3):211-226.
张永康,1997.江苏东海———中国大陆科学钻探的最佳选区之一.江苏地质,21(3):129-137.
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