苏鲁超高压变质带的深部构造特征——宽频地震层析结果
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摘要
为了探测苏鲁超高压变质带的岩石圈结构实施了山东日照到滨洲剖面的宽频带地震探测,于2003～2005年使用REFTER130-01型和CMG-6TD型三分量地震仪(频宽50～60s)。以10～25km间距布设了25个台站观测近三年时间,由远震地震层析反演结果得到了华北板块、超高压变质带、扬子板块清晰的P波速度图像。华北板块具有简单的低速体形态,越过郯庐断裂向超高压变质带扩张,并平稳地由郯庐断裂向北延伸直到黄河以北的古城镇。Moho面和岩石圈深度分别为30～35km,75～80km;扬子板块为高速体,界于两者之间的苏鲁超高压变质带地壳的平均速度大于两侧板块,剖面上从日照到五莲-烟台断裂范围内除地壳为高速体外,30～60km深度范围内有一个高速体和一个低速体拼会在一起,构成了超高压变质带岩石圈最突出的构造特征。此高速体应为榴辉橄榄岩等超基性岩组成,它可能属于折返回来又被移动的超高压变质岩组合体,并与华北板块基底直接接触,超高压变质带的下界面深度为60km。下界面平直,可能意味着正在消退的造山带的山根,或是造山带的下一层Moho面?郯庐断裂带地壳出露的共四条带,比较陡的产状向深部延伸,并逐步向南倾,TLF2～TLF4在岩石圈底界处合并。
In order to understand the lithosphere structure beneath Sulu UHPM,a broadband seismic survey was conducted during 2003～2005 from Rizhao to Binzhou in Shandong province,deploying 25 stations with a spacing of 10～25km,using REFTER130-01 and CMG-6TD with three-components seismometers(period between 50～60s),and recording seismic data up to almost three years. The P-velocity image from seismic tomography by the acquired data clearly depicts the characteristics of the different tectonic units, including North China terrane,Sulu UHPM,and Yangtze terrane.The North China terrane within the lithosphere shows a low velocity block which extends stably towards north to Gucheng Zhen in the north of yellow river across Tanlu fault,and the depths of Moho and lithosphere of the North China Terrane are 30～35 and 75～80km,respectively.The Yangtze terrane,however,has a high velocity background.The Sulu UHPM locates between North China Terrane and Yangtze terrane,and its average crust velocity is higher than that in both sides.The UHPM is significantly featured by two high velocity blocks between Rizhao and Wulian-Yantai Fault,one within the crust and another at depth of 30～60km,which probably are composed of ultra-mafic rocks,like ecologites,were exhumated and relocated to form the ultra-metamorphic-rock complex.The bottom of the high velocity block at depth of 60km indicates that the depth of the Sulu UHPM is 60 km,and the flat bottom implies an disappearing orogenic root or another Moho discontinuity?Meanwhile,the tomography image also gives a outline of the Tanlu Fault belt,which inclines steeply towards south and vanished at the bottom of the lithosphere.
In order to understand the lithosphere structure beneath Sulu UHPM,a broadband seismic survey was conducted during 2003～2005 from Rizhao to Binzhou in Shandong province,deploying 25 stations with a spacing of 10～25km,using REFTER130-01 and CMG-6TD with three-components seismometers(period between 50～60s),and recording seismic data up to almost three years. The P-velocity image from seismic tomography by the acquired data clearly depicts the characteristics of the different tectonic units, including North China terrane,Sulu UHPM,and Yangtze terrane.The North China terrane within the lithosphere shows a low velocity block which extends stably towards north to Gucheng Zhen in the north of yellow river across Tanlu fault,and the depths of Moho and lithosphere of the North China Terrane are 30～35 and 75～80km,respectively.The Yangtze terrane,however,has a high velocity background.The Sulu UHPM locates between North China Terrane and Yangtze terrane,and its average crust velocity is higher than that in both sides.The UHPM is significantly featured by two high velocity blocks between Rizhao and Wulian-Yantai Fault,one within the crust and another at depth of 30～60km,which probably are composed of ultra-mafic rocks,like ecologites,were exhumated and relocated to form the ultra-metamorphic-rock complex.The bottom of the high velocity block at depth of 60km indicates that the depth of the Sulu UHPM is 60 km,and the flat bottom implies an disappearing orogenic root or another Moho discontinuity?Meanwhile,the tomography image also gives a outline of the Tanlu Fault belt,which inclines steeply towards south and vanished at the bottom of the lithosphere.
引文
Cong BL and Wang QC.1999.Newly research developments on Dabie- Sulu UHP metamorphic belts.Chinese Science Bulletin,44 (11): 1127-1148 (in Chinese)
Gao S,Liu YJ.1999.Deep structures and composition of continental crust.In:Zheng YF (ed.).Chemical Geodynamics.Beijing: Science Press,168-201 (in Chinese)
Jiang M,Li HO,Wang YJ et al.2006.The effect of Qinghai-Tibet plateau uplift on the structure of crust and upper mantle beneath the Tianshan mountains in Xinjiang.Earth Science Frontiers,13 (5): 401-407 (in Chinese with English abstract)
Jiang M,Wang YX,Su HP.2003.Applications of a broadband seismic technique in deep seismic exploration.Geological Bulletin of China, 22 (7):536-539 (in Chinese with English abstract)
Jin ZM,Ou XG,Xu HJ etal.2004.Elastic wave velocities of the 2000m depth at Chinese Continental Scientific Drilling:Constraints on deep seismic reflection.Acts Petrologica Sinica,20(1):81-96(in Chinese with English abstract)
Jin ZM,Yu RD,Yang WC et al.2003.Mantle-derived xenoliths of peridotite from Pingmingshan,Donghai County,Jiangsu province and their implications for deep structures.Acta Geologica Sinica,77 (4):451-462 (in Chinese with English abstract)
Liou JG,Zhang RY.1996.Occurences of intergranular coesite in ultrabigh-P rocks from the Sulu region,eastern China:implications for lack of fluid during exhumation.Amer Mineralogist,81:1217- 1221
Liu FT,Xu PF,Liu JS.2003.The crustal velocity structure of the continental deep subduction belt:study on the Eastern Dabie orogen by seismic wide-angle reflection/refraction.Chinese Journal of Geophysics,46 (3):366-372 (in Chinese with English abstract)
Qian H,Su HP,Jiang M et al.2004.Tomography in the Chinese Continental Scientific Drilling Area of Donghai County,Jiangsu Province,Chian.Acta Geologies Sinica,78 (1):139-144(in Chinese with English abstract)
Sobolev NV,Shatsky VS.1990.Diamond inclusions in garnets from metamorphic rocks:a new environment for diamond formation. Nature,343:742-746
Wang YX,Jiang M,Han GH.2004.Crustal Velocity Structure beneath the Site of Chinese Continental Scientific Drilling Site.Earth Science - Journal of China University of Geasciences,29(6) :667-673 (in Chinese with English abstract)
Xu JR,Zhao ZX.2004.Regional structure characteristics of crustal root of mountain beneath the Sulu orogenic belt.Acta Petrologica Sinica, 20(1):149-156 (in Chinese with English abstract)
Xu PF,Liu FT,Wang QC et al.2000.Tomography Research of Dabie- Suhi orogeny-3-D velocity structure of lithosphere.Chinese Journal of Geophysics,43 (3):377-385 (in Chinese with English abstract)
Xu S,Okay AI,Ji Set al.1992.Diamond from.metamorphic rocks and its implication for tectonic setting.Science,256:80 -82
Xu ZQ.2004.The scientific goals and investigation progresses of the Chinese Continental Scientific Drilling Project.Acts Petrologica Sinica,20(1):1-8 (in Chinese with English abstract)
Yang WC,Cheng ZY,Chen GJ et al.1999.Geophysical investigations in northern Sulu UHPM belt,part I:deep seismic reflection. Chinese Journal of Geophysics,42 (1):41-52 (in Chinese with English abstract)
Yang WC,Fang H,Cheng ZY et al.1999.Geophysical investigation of northern Suhi UHPM terrane in East China (II):non-seismic methods.Chinese Journal of Geophysics,42(4):508-519 (in Chinese with English abstract)
Yang WC,Hu ZY,Cheng ZY et al.1999.Long profile of geophysical investigation from TANCHEN to LIANSHUI East-Central China. Chinese Journal of Geophysics,42(2):206-217 (in Chinese with English abstract)
Yang WC,Yang WY,Chen ZY.2004.Interpretation of 3D seismic reflection data in the Chinese Continental Scientific Drilling site. Acta Petrologica Sinica,20(1):127-138 (in Chinese with English abstract)
Ye K,Hirajima T,lshiwatari Aet al.1996.The discovery of intergranular coesite in eclogite of Yangke,Qingdao and its significance.Chinese Science Bulletin,41:1407-1408 (in Chinese)
Ye K,Hirajima T.1996.High-pressure marble at Yangguantun, Rongcheng County,Shangdong Province,eastern China.Mineralogy and Petrology,57:151-165
Yu QF,Yao CL,Meng XH et al.2001.Inversion and interpretation of gravity and magnatic anormality in the target area of CCSD of Northern Jiangsu.Journal of Geophysics,44 (6):825-832
Zhang ZM,Xu ZQ et al.1999.The metamorphism of ecologite in drilling pore ZK703 of UHPM in the south of Sulu area.Acta Geologica Sinica,73 (4):321-333 (in Chinese with English abstract)
Zhao XD,Zhang ZM.2006.Study of hydroxyl content of omphacite in UHP-eclogite from the main hole of Chinese Continental Scientific Drilling Project.Acta Petrologica Sinica,22(7):2039-2050 (in Chinese with English abstract)
Zhao ZX,Xu JR,Xu ZQ.2004.3-D S wave velocity structure in the upper mantle and the mechanism investigation for the ultrahigh- pressure metamorphosed belt in the Dabie-Sulu region.Acta Petrologica Sinica,20 (1):157-164 (in Chinese with English abstract)
Zhao ZX,Xu JR,Yang WC et al.2004.Simulations of reflection profile of borehole area of Chinese Continental Scientific Drilling.Acta Petrologica Sinica,20(1):139-148(in Chinese with English abstract)
从柏林，王清晨．1999．大别山—苏鲁超高压变质带研究的最新进展．科学通报，44(11)：1127—1141
高山，金振民，Kern H等．1997．大别超高压榴辉岩高温高压下地震波波速和密度的初步实验研究——对造山带地壳深部组成和莫霍面性质的启示．科学通报，42(8)：862—866
高山，刘勇胜．1999．大陆地壳深部结构与组成．见：郑永飞主编．化学地球动力学．北京：科学出版社，168-201
姜枚，李海鸥，王亚军等．2006．青藏高原隆升对新疆天山山脉地壳-上地幔构造的影响．地学前缘，13(5)：401-407
姜枚，王有学，宿和平．2003．宽频地震方法技术在地震探测工作中的应用．地质通报，22(7)：536—539
金振民，欧新功，徐海军等．2004．中国大陆科学钻探主孔100～2000m岩石弹性波速度：对地震深反射的约束．岩石学报，20(1)：81-96
金振民，余日东，杨文采等．2003．江苏东海县幔源橄榄岩包体及其深部构造意义．地质学报，77(4)：451-462
刘福田，徐佩芬，刘劲松等．2003．大别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，46(3)：366—372
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
徐纪人，赵志新．2004．苏鲁造山带区域地壳山根结构特征．岩石学报，20(1)：149—156
徐佩芬，刘福田，王清晨等．2000．大别—苏鲁碰撞造山带的地震层析成像研究——岩石圈三维速度结构．地球物理学报，43(3)：377—385
许志琴．2004．中国大陆科学钻探工程的科学目标及初步成果．岩石学报，20(1)：1-8
王有学，姜枚，韩国华．2004．中国大陆科学钻探场址区的地壳速度结构特征．地球科学，29(6)：667—673
杨文采，程振炎，陈国九等．1999．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，方慧，程振炎等．1999．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
杨文采，胡振远，程振炎等．1999．郯城—涟水综合地球物理剖面．地球物理学报，42(2)：206-217
杨文采，杨午阳，程振炎．2004．中国大陆科学钻探孔区三维地震资料的初步解释．岩石学报，20(1)：127—138
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
张泽民，许志琴，刘福来等．2003．南苏鲁造山带的超高压变质岩及岩石化学研究．地质学报，77(4)：478-491
赵志新，徐纪人，许志琴．2004．上地幔三维S波速度结构与大别苏鲁超高压变质带俯冲折返机制探讨．岩石学报，20(1)：157—164
赵志新，徐纪人，杨文采等．2004．中国大陆科学钻探孔区反射地震剖面的数值模拟与分析．岩石学报，20(1)：139-148
Gao S,Liu YJ.1999.Deep structures and composition of continental crust.In:Zheng YF (ed.).Chemical Geodynamics.Beijing: Science Press,168-201 (in Chinese)
Jiang M,Li HO,Wang YJ et al.2006.The effect of Qinghai-Tibet plateau uplift on the structure of crust and upper mantle beneath the Tianshan mountains in Xinjiang.Earth Science Frontiers,13 (5): 401-407 (in Chinese with English abstract)
Jiang M,Wang YX,Su HP.2003.Applications of a broadband seismic technique in deep seismic exploration.Geological Bulletin of China, 22 (7):536-539 (in Chinese with English abstract)
Jin ZM,Ou XG,Xu HJ etal.2004.Elastic wave velocities of the 2000m depth at Chinese Continental Scientific Drilling:Constraints on deep seismic reflection.Acts Petrologica Sinica,20(1):81-96(in Chinese with English abstract)
Jin ZM,Yu RD,Yang WC et al.2003.Mantle-derived xenoliths of peridotite from Pingmingshan,Donghai County,Jiangsu province and their implications for deep structures.Acta Geologica Sinica,77 (4):451-462 (in Chinese with English abstract)
Liou JG,Zhang RY.1996.Occurences of intergranular coesite in ultrabigh-P rocks from the Sulu region,eastern China:implications for lack of fluid during exhumation.Amer Mineralogist,81:1217- 1221
Liu FT,Xu PF,Liu JS.2003.The crustal velocity structure of the continental deep subduction belt:study on the Eastern Dabie orogen by seismic wide-angle reflection/refraction.Chinese Journal of Geophysics,46 (3):366-372 (in Chinese with English abstract)
Qian H,Su HP,Jiang M et al.2004.Tomography in the Chinese Continental Scientific Drilling Area of Donghai County,Jiangsu Province,Chian.Acta Geologies Sinica,78 (1):139-144(in Chinese with English abstract)
Sobolev NV,Shatsky VS.1990.Diamond inclusions in garnets from metamorphic rocks:a new environment for diamond formation. Nature,343:742-746
Wang YX,Jiang M,Han GH.2004.Crustal Velocity Structure beneath the Site of Chinese Continental Scientific Drilling Site.Earth Science - Journal of China University of Geasciences,29(6) :667-673 (in Chinese with English abstract)
Xu JR,Zhao ZX.2004.Regional structure characteristics of crustal root of mountain beneath the Sulu orogenic belt.Acta Petrologica Sinica, 20(1):149-156 (in Chinese with English abstract)
Xu PF,Liu FT,Wang QC et al.2000.Tomography Research of Dabie- Suhi orogeny-3-D velocity structure of lithosphere.Chinese Journal of Geophysics,43 (3):377-385 (in Chinese with English abstract)
Xu S,Okay AI,Ji Set al.1992.Diamond from.metamorphic rocks and its implication for tectonic setting.Science,256:80 -82
Xu ZQ.2004.The scientific goals and investigation progresses of the Chinese Continental Scientific Drilling Project.Acts Petrologica Sinica,20(1):1-8 (in Chinese with English abstract)
Yang WC,Cheng ZY,Chen GJ et al.1999.Geophysical investigations in northern Sulu UHPM belt,part I:deep seismic reflection. Chinese Journal of Geophysics,42 (1):41-52 (in Chinese with English abstract)
Yang WC,Fang H,Cheng ZY et al.1999.Geophysical investigation of northern Suhi UHPM terrane in East China (II):non-seismic methods.Chinese Journal of Geophysics,42(4):508-519 (in Chinese with English abstract)
Yang WC,Hu ZY,Cheng ZY et al.1999.Long profile of geophysical investigation from TANCHEN to LIANSHUI East-Central China. Chinese Journal of Geophysics,42(2):206-217 (in Chinese with English abstract)
Yang WC,Yang WY,Chen ZY.2004.Interpretation of 3D seismic reflection data in the Chinese Continental Scientific Drilling site. Acta Petrologica Sinica,20(1):127-138 (in Chinese with English abstract)
Ye K,Hirajima T,lshiwatari Aet al.1996.The discovery of intergranular coesite in eclogite of Yangke,Qingdao and its significance.Chinese Science Bulletin,41:1407-1408 (in Chinese)
Ye K,Hirajima T.1996.High-pressure marble at Yangguantun, Rongcheng County,Shangdong Province,eastern China.Mineralogy and Petrology,57:151-165
Yu QF,Yao CL,Meng XH et al.2001.Inversion and interpretation of gravity and magnatic anormality in the target area of CCSD of Northern Jiangsu.Journal of Geophysics,44 (6):825-832
Zhang ZM,Xu ZQ et al.1999.The metamorphism of ecologite in drilling pore ZK703 of UHPM in the south of Sulu area.Acta Geologica Sinica,73 (4):321-333 (in Chinese with English abstract)
Zhao XD,Zhang ZM.2006.Study of hydroxyl content of omphacite in UHP-eclogite from the main hole of Chinese Continental Scientific Drilling Project.Acta Petrologica Sinica,22(7):2039-2050 (in Chinese with English abstract)
Zhao ZX,Xu JR,Xu ZQ.2004.3-D S wave velocity structure in the upper mantle and the mechanism investigation for the ultrahigh- pressure metamorphosed belt in the Dabie-Sulu region.Acta Petrologica Sinica,20 (1):157-164 (in Chinese with English abstract)
Zhao ZX,Xu JR,Yang WC et al.2004.Simulations of reflection profile of borehole area of Chinese Continental Scientific Drilling.Acta Petrologica Sinica,20(1):139-148(in Chinese with English abstract)
从柏林，王清晨．1999．大别山—苏鲁超高压变质带研究的最新进展．科学通报，44(11)：1127—1141
高山，金振民，Kern H等．1997．大别超高压榴辉岩高温高压下地震波波速和密度的初步实验研究——对造山带地壳深部组成和莫霍面性质的启示．科学通报，42(8)：862—866
高山，刘勇胜．1999．大陆地壳深部结构与组成．见：郑永飞主编．化学地球动力学．北京：科学出版社，168-201
姜枚，李海鸥，王亚军等．2006．青藏高原隆升对新疆天山山脉地壳-上地幔构造的影响．地学前缘，13(5)：401-407
姜枚，王有学，宿和平．2003．宽频地震方法技术在地震探测工作中的应用．地质通报，22(7)：536—539
金振民，欧新功，徐海军等．2004．中国大陆科学钻探主孔100～2000m岩石弹性波速度：对地震深反射的约束．岩石学报，20(1)：81-96
金振民，余日东，杨文采等．2003．江苏东海县幔源橄榄岩包体及其深部构造意义．地质学报，77(4)：451-462
刘福田，徐佩芬，刘劲松等．2003．大别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，46(3)：366—372
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
徐纪人，赵志新．2004．苏鲁造山带区域地壳山根结构特征．岩石学报，20(1)：149—156
徐佩芬，刘福田，王清晨等．2000．大别—苏鲁碰撞造山带的地震层析成像研究——岩石圈三维速度结构．地球物理学报，43(3)：377—385
许志琴．2004．中国大陆科学钻探工程的科学目标及初步成果．岩石学报，20(1)：1-8
王有学，姜枚，韩国华．2004．中国大陆科学钻探场址区的地壳速度结构特征．地球科学，29(6)：667—673
杨文采，程振炎，陈国九等．1999．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，方慧，程振炎等．1999．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
杨文采，胡振远，程振炎等．1999．郯城—涟水综合地球物理剖面．地球物理学报，42(2)：206-217
杨文采，杨午阳，程振炎．2004．中国大陆科学钻探孔区三维地震资料的初步解释．岩石学报，20(1)：127—138
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
张泽民，许志琴，刘福来等．2003．南苏鲁造山带的超高压变质岩及岩石化学研究．地质学报，77(4)：478-491
赵志新，徐纪人，许志琴．2004．上地幔三维S波速度结构与大别苏鲁超高压变质带俯冲折返机制探讨．岩石学报，20(1)：157—164
赵志新，徐纪人，杨文采等．2004．中国大陆科学钻探孔区反射地震剖面的数值模拟与分析．岩石学报，20(1)：139-148
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