鲁西地区的地壳结构及壳内近直立高速异常体的发现
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摘要
长320 km横跨鲁西地区的聊城-连云港宽角反射地震剖面揭示了鲁西地区的地壳结构,上地壳为二层结构,总厚18~20 km,速度5.4~6.2 km/s;下地壳也分为二层结构,总厚度13~15 km,速度6.4~6.7 km/s.Moho深度33~35 km.Pn速度为7.9 km/s.地壳速度分布在横向上有较大变化,且平均速度为6.2~6.5 km/s,较正常值偏高.研究结果发现地壳内有两个近直立的高速体.从下地壳延伸到上地壳并直达沉积盆地的底部.可能是幔源岩浆大量侵入地壳,使得地壳的局部平均速度增高.近直立的高速体可能是幔源岩桨上涌的通道.鲁西地壳结构的研究对于探讨古地台的裂解与沉陷机制具有一定的意义.
The crustal velocity structure of western Shandong is presented from a DSS profile with a length of 320 km.In this area,the depth of Moho layer is from 33 km to 35 km.The thickness of upper crust is 18～20 km,the velocity is 5.4～6.2 km/s; these of the lower crust are respectively 13～15 km,6.4～6.7 km/s.Pn velocity in this region is 7.9 km/s.Crustal velocity varies transversally at a rather large range.The mean velocity is from 6.2 km/s to 6.5 km/s,higher than the normal value.In the crust there are two nearly vertically high-velocity blocks,stretching from the lower crust to the upper crust reaching the bottom of the sediment basin.It is possible that a large mount of magma from the upper mantle gushes up into the crust,causing the increase of the crustal mean velocity.The high velocity blocks are the channels of mantle magma to go up through.
The crustal velocity structure of western Shandong is presented from a DSS profile with a length of 320 km.In this area,the depth of Moho layer is from 33 km to 35 km.The thickness of upper crust is 18～20 km,the velocity is 5.4～6.2 km/s; these of the lower crust are respectively 13～15 km,6.4～6.7 km/s.Pn velocity in this region is 7.9 km/s.Crustal velocity varies transversally at a rather large range.The mean velocity is from 6.2 km/s to 6.5 km/s,higher than the normal value.In the crust there are two nearly vertically high-velocity blocks,stretching from the lower crust to the upper crust reaching the bottom of the sediment basin.It is possible that a large mount of magma from the upper mantle gushes up into the crust,causing the increase of the crustal mean velocity.The high velocity blocks are the channels of mantle magma to go up through.
引文
[1]马杏垣,刘昌铨,刘国栋.江苏响水至内蒙古满都拉地学断面.地质学报,1991,(3):199~215Ma X Y,Liu C Q,Liu G D.Geoscience transect from Xiangshui(Jiangsu Province)to Mandula(Nei Mongolia).Acta GeologicaSinca(in Chinese),1991,(3):199~215
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[7]陈立辉,周新华.鲁西中生代闪长岩中的深源超镁铁质岩捕虏体及其富硅交代特征.中国科学,2003,33(8):734~744Chen L H,Zhou X H.Ultramafic xenoliths in Mesozoic diorite inwest Shandong Province.Science in China(Ser.D),2004,47(6):489~499
[8]许文良,王冬梅,高山,林景仟.鲁西中生代金岭闪长岩中纯橄岩和辉石岩包体的发现及其意义.科学通报,2003,48(8):863~868Xu W L,Wang D M,Gao S,Lin J Q.Discovery of dunite andpyroxenite xenoliths in Mesozoic diorite at Jinling,western Shandongand its significance.Chinese Science Bulletin,2003,48(15):1599~1604
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[12]杨学明,杨晓勇,Lebas M J.碳酸岩的地质地球化学特征及其大地构造意义.地球科学进展,1998,13(5):457~466Yang X M,Yang X Y,Lebas M J.Geological and geochemicalcharacteristics of carbonate and their implication for tectonic settings.Advance in Earth Science(in Chinese),1998,13(5):457~466
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[14]张自桓.鲁西伸展构造.山东地质,1995,11(2):23~31Zhang Z H.The extensional structure in western Shandong Province.Shandong Geology(in Chinese),1995,11(2):23~31
[15]牛树银,胡华斌,毛景文等.鲁西地区地质构造特征及其形成机制.中国地质,2004,31(1):34~39Niu S Y,Hu H B,Mao J W,et al.Structure in western Shandong andits genetic mechanism.Chinese Geology(in Chinese),2004,31(1):34~39
[16]刘若新,杨美娥,胥怀济等.华北地区新生代玄武岩中超镁铁质捕虏体初步研究.地震地质,1981,3(3):1~16Liu R X,Yang M E,Xu H J,et al.Preliminary study of ultramaficxenoliths from Cenozoic alkaline basalts in north China.Seismologyand Geology(in Chinese),1981,3(3):1~16
[17]马杏垣,刘昌铨,刘国栋主编.江苏响水至内蒙古满都拉地学断面说明书.北京:地质出版社,1991.16~27Ma X Y,Liu C Q,Liu G D.Explanation to Xiangshui(JiangsuProvince)to Mandula(Nei Mongolia)Geoscience Transect.Beijing:Geological Publishing House,1991.16~27
[18]中国科学院地球物理研究所,福建地质矿产局编著.福建地热地球物理研究.北京:中国科学技术出版社,1992.94~126Institute of Geophysics Chinese Academy of Sciences,Geology andMineral Bureau of Fujian Province.The Geothermic and GeophysicsStudy in Fujian Province.Beijing:Chinese Science and TechnologyPress,1992.94~126
[19]杨文采,张春贺,朱光明.标定大陆科学钻探孔区地震反射体.地球物理学报,2002,45(3):370~383Yang W C,Zhang C H,Zhu G M.Calibration of seismic reflectors inChinese Continental drilling area.Chinese J.Geophys.(inChinese),2002,45(3):370~383
[20]刘福田,徐佩芬,刘劲松等.大陆深俯冲带的地壳速度结构-东大别造山带深地震宽角反射/折射研究.地球物理学报,2003,46(3):366~372Liu F T,Xu P F,Liu J S,et al.The crustal velocity structure of thecontinental deep subduction belt:study on the eastern Dabie orogen byseismic wide-angle reflection/refraction.Chinese J.Geophys.(inChinese),2003,46(3):366~372
[21]李曙光,黄方,李辉.大别-苏鲁造山带碰撞后的岩石圈拆离.科学通报,2001,46(17):1487~1490Li S G,Huang F,Li H.Lithosphere delamination in Dabie-Suluorogenic belt after the collision.Chinese Science Bulletin(inChinese),2001,46(17):1487~1490
[22]Suo S T,Zhong Z Q,You Z D,et al.Post-collisional ductileextensional tectonic framework in the UHP and HP metamorphic beltsin the Dabie-Sulu region China.Acta Geologica Sinica,2001,75(2):151~160
[23]杨文采,汪集.苏鲁地区地壳岩浆底侵的地球物理判识.地质学报,2002,76(2):173~179Yang W C,Wang J Y.Geophysical evidences for magmaticunderplating in the Sulu area east China.Acta Geologica Sinica(inChinese),2002,76(2):173~179
[24]赖绍聪.岩浆作用的物理过程研究进展.地球科学进展,1999,14(2):153~158Lai S C.Advances in the physics process research on magmatism.Advance in Earth Sciences(in Chinese),1999,14(2):153~158
[2]刘昌铨,嘉世旭,杜官恒.江苏响水-内蒙古满都拉地学断面地震折射测深结果.地震地质,1991,13(3):193~204Liu C Q,Jia S X,Du G H.Result of seismic refraction soundingalong the transect from Jiangsu Xiangshui to Nei Mongol Mandula.Seismology and Geology(in Chinese),1991,13(3):193~204
[3]江钊,孙洁,徐常芳等.江苏响水-内蒙古满都拉地壳上地幔电性结构初探-地学断面研究报道之三.地震地质,1990,12(3):193~206Jiang Z,Sun J,Xu C F,et al.Preliminary study on the conductivitystructure of the crust and upper mantle:third report on the geosciencetransect from Jiangsu Xiangshui to Nei Mongol.Seismology andGeology(in Chinese),1990,12(3):193~206
[4]马杏垣,王楫,李双庆等.有关内蒙古地质构造的一线之见-江苏响水至内蒙古满都拉地学断面北段研究报道之一.地震地质,1988,10(4):45~50Ma X Y,Wang J,Li S Q,et al.A report of geological observations onnorthern segment(Baotou to Mandula)of the geoscience transect fromJiangsu Xiangshui to Nei Mongol Mandula.Seismology and Geology(in Chinese),1988,10(4):45~50
[5]任纪舜,王作勋,陈炳蔚等.从全球看中国大地构造-中国及邻区大地构造图简要说明.北京:地质出版社,1999Ren J S,Wang Z X,Chen B W,et al.The Location of ChineseTectonic Structure in the Global-the Brief Explanation About theTectonic Structure Map of China and the Neighbor Area(in Chinese).Beijing:Geological Publishing House,1999
[6]宋明春,李洪奎.山东省区域地质构造演化探讨.山东地质,2001,17(6):12~21Song M C,Li H K.Study on regional geological structural evolutionin Shandong Province.Shandong Geology(in Chinese),2001,17(6):12~21
[7]陈立辉,周新华.鲁西中生代闪长岩中的深源超镁铁质岩捕虏体及其富硅交代特征.中国科学,2003,33(8):734~744Chen L H,Zhou X H.Ultramafic xenoliths in Mesozoic diorite inwest Shandong Province.Science in China(Ser.D),2004,47(6):489~499
[8]许文良,王冬梅,高山,林景仟.鲁西中生代金岭闪长岩中纯橄岩和辉石岩包体的发现及其意义.科学通报,2003,48(8):863~868Xu W L,Wang D M,Gao S,Lin J Q.Discovery of dunite andpyroxenite xenoliths in Mesozoic diorite at Jinling,western Shandongand its significance.Chinese Science Bulletin,2003,48(15):1599~1604
[9]胡华斌,牛树银,毛景文等.鲁西中生代幔枝构造及其金矿化.矿床地质,2004,23(1):115~122Hu H B,Niu S Y,Mao J W,et al.Mesozoic mantle-branch structureand related gold deposits in western Shandong.Mineral Deposits(inChinese),2004,23(1):115~122
[10]王世进,张成基,宋明春等.山东省侵入岩岩石单位及其代号的厘定.山东地质,2002,18(1):9~21Wang S J,Zhang C J,Song M C,et al.Classification of intrusive rockunits and the code names in Shandong Province.Shandong Geology(in Chinese),2002,18(1):9~21
[11]林景仟,谭东娟,金烨.鲁西地区中生代火山活动的40Ar/39Ar年龄.岩石矿物学杂志,1996,15(3):213~220Lin J Q,Tan D J,Jin Y.40Ar/39Ar ages of Mesozoic igneousactivities in western Shandong.Acta Petrologica et Mineralogical(inChinese),1996,15(3):213~220
[12]杨学明,杨晓勇,Lebas M J.碳酸岩的地质地球化学特征及其大地构造意义.地球科学进展,1998,13(5):457~466Yang X M,Yang X Y,Lebas M J.Geological and geochemicalcharacteristics of carbonate and their implication for tectonic settings.Advance in Earth Science(in Chinese),1998,13(5):457~466
[13]邱检生,徐夕生,罗清华.鲁西富钾火山岩和煌斑岩的40Ar-39Ar定年及源区示踪.科学通报,2001,46(18):1500~1508Qiu J S,Xu X S,Luo Q H.40Ar-39Ar dating and provenancetracing of K-rich volcanic and lamprophyre in western Shandong.Chinese Science Bulletin(in Chinese),2001,46(18):1500~1508
[14]张自桓.鲁西伸展构造.山东地质,1995,11(2):23~31Zhang Z H.The extensional structure in western Shandong Province.Shandong Geology(in Chinese),1995,11(2):23~31
[15]牛树银,胡华斌,毛景文等.鲁西地区地质构造特征及其形成机制.中国地质,2004,31(1):34~39Niu S Y,Hu H B,Mao J W,et al.Structure in western Shandong andits genetic mechanism.Chinese Geology(in Chinese),2004,31(1):34~39
[16]刘若新,杨美娥,胥怀济等.华北地区新生代玄武岩中超镁铁质捕虏体初步研究.地震地质,1981,3(3):1~16Liu R X,Yang M E,Xu H J,et al.Preliminary study of ultramaficxenoliths from Cenozoic alkaline basalts in north China.Seismologyand Geology(in Chinese),1981,3(3):1~16
[17]马杏垣,刘昌铨,刘国栋主编.江苏响水至内蒙古满都拉地学断面说明书.北京:地质出版社,1991.16~27Ma X Y,Liu C Q,Liu G D.Explanation to Xiangshui(JiangsuProvince)to Mandula(Nei Mongolia)Geoscience Transect.Beijing:Geological Publishing House,1991.16~27
[18]中国科学院地球物理研究所,福建地质矿产局编著.福建地热地球物理研究.北京:中国科学技术出版社,1992.94~126Institute of Geophysics Chinese Academy of Sciences,Geology andMineral Bureau of Fujian Province.The Geothermic and GeophysicsStudy in Fujian Province.Beijing:Chinese Science and TechnologyPress,1992.94~126
[19]杨文采,张春贺,朱光明.标定大陆科学钻探孔区地震反射体.地球物理学报,2002,45(3):370~383Yang W C,Zhang C H,Zhu G M.Calibration of seismic reflectors inChinese Continental drilling area.Chinese J.Geophys.(inChinese),2002,45(3):370~383
[20]刘福田,徐佩芬,刘劲松等.大陆深俯冲带的地壳速度结构-东大别造山带深地震宽角反射/折射研究.地球物理学报,2003,46(3):366~372Liu F T,Xu P F,Liu J S,et al.The crustal velocity structure of thecontinental deep subduction belt:study on the eastern Dabie orogen byseismic wide-angle reflection/refraction.Chinese J.Geophys.(inChinese),2003,46(3):366~372
[21]李曙光,黄方,李辉.大别-苏鲁造山带碰撞后的岩石圈拆离.科学通报,2001,46(17):1487~1490Li S G,Huang F,Li H.Lithosphere delamination in Dabie-Suluorogenic belt after the collision.Chinese Science Bulletin(inChinese),2001,46(17):1487~1490
[22]Suo S T,Zhong Z Q,You Z D,et al.Post-collisional ductileextensional tectonic framework in the UHP and HP metamorphic beltsin the Dabie-Sulu region China.Acta Geologica Sinica,2001,75(2):151~160
[23]杨文采,汪集.苏鲁地区地壳岩浆底侵的地球物理判识.地质学报,2002,76(2):173~179Yang W C,Wang J Y.Geophysical evidences for magmaticunderplating in the Sulu area east China.Acta Geologica Sinica(inChinese),2002,76(2):173~179
[24]赖绍聪.岩浆作用的物理过程研究进展.地球科学进展,1999,14(2):153~158Lai S C.Advances in the physics process research on magmatism.Advance in Earth Sciences(in Chinese),1999,14(2):153~158