郯城-涟水综合地球物理剖面
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摘要
在穿过苏鲁地体的郯城-涟水剖面上进行了深反射地震和大地电磁调查，剖面全长１３９．５ｋｍ，取得了高质量记录，一级品记录高达８５％。结果表明：（１）苏鲁超高压－高压变质岩片向北西倾斜，表现为高速高阻岩片，并受到强烈的变形，反映了超高压岩片的俯冲与折返；（２）杨子克拉通向北俯冲在苏鲁地体之下，表现为常速、中低阻的挠曲板状体，内部有大量反映碰撞的反射楔形体；（３）嘉山-响水断裂带向南陡倾，低阻带直通浅地幔，具有燕山期裂谷的特征，估计有可能是与沂沭断裂带同期的中生代裂谷；（４）印支期俯冲扬子地壳的古Ｍｏｈｏ面与期后形成的新Ｍｏｈｏ面都有强反射，表明中新生代在地壳底部有强烈的岩浆活动与壳幔相互作用，促使新Ｍｏｈｏ面的形成；（５）超高压变质带下方有一组南倾的逆断层，与折返有关，在此处进行科学钻探对了解超高压变质带形成和折返机制很有利。
Deep seismic reflection and MT surveys along an 139km profile across the SuluUHPM terrane from Tangchen to Lianshui have been completed, producing highquality records and rich geological information about crustal structures. The resultsinclude (a) The Sulu UHPM and HPM terrane is a rock-slice with high velocity andresistivity, dipping northwest and undergone heavy deformation, implying itssubduction and then exhumation during Track Period, (b) the Yangtze craton,showing as a bent plate with normal velocity and relatively low resistivity, wassubducting northward beneath the Sulu UHPM terrane, containing a lot of wedgereflectors related to the collision between the Sulu and the Yangtze; (c) the Jiashan-Xionzhui fault zone contains two faults of steeply dipping south, corresponding to alow-resistivity zone reaching the oppermost mantle, probably implying that it might bea Mesozoic rift similar to the Ni-Shu Fault zone; (d) both the old Moho of theIndosinian subducting Yangtze crust and the new Moho formed after IndosinianMovement have strong and clear reflectors, indicating strong magmatic activities andinteraction between the crust of the mantle during Mesozoic Period which contributedto the formation and the new Moho; and (e) a group of thrusts exist in the uppercrust under the Sulu UHPM belt which may closely related to the exhumation of theUHPM belt, encouraging the scientific drilling in the South Sulu area whose aimsinclude revealing the exhumation dynamics of the UHPM belt.
Deep seismic reflection and MT surveys along an 139km profile across the SuluUHPM terrane from Tangchen to Lianshui have been completed, producing highquality records and rich geological information about crustal structures. The resultsinclude (a) The Sulu UHPM and HPM terrane is a rock-slice with high velocity andresistivity, dipping northwest and undergone heavy deformation, implying itssubduction and then exhumation during Track Period, (b) the Yangtze craton,showing as a bent plate with normal velocity and relatively low resistivity, wassubducting northward beneath the Sulu UHPM terrane, containing a lot of wedgereflectors related to the collision between the Sulu and the Yangtze; (c) the Jiashan-Xionzhui fault zone contains two faults of steeply dipping south, corresponding to alow-resistivity zone reaching the oppermost mantle, probably implying that it might bea Mesozoic rift similar to the Ni-Shu Fault zone; (d) both the old Moho of theIndosinian subducting Yangtze crust and the new Moho formed after IndosinianMovement have strong and clear reflectors, indicating strong magmatic activities andinteraction between the crust of the mantle during Mesozoic Period which contributedto the formation and the new Moho; and (e) a group of thrusts exist in the uppercrust under the Sulu UHPM belt which may closely related to the exhumation of theUHPM belt, encouraging the scientific drilling in the South Sulu area whose aimsinclude revealing the exhumation dynamics of the UHPM belt.
引文
1杨文采,程振炎,陈国九等。苏鲁超高压变质带北部地球物理调查( ):深反射地震。地球物理学报, 1999,42(1): 41-52YANG Wen-Cai, CHENG Zhen-Yan, CHEN Gu-Jiu, et al. Geolphysical investigations in northern Sulu UHPM belt, Part I: Seismic reflection. Chinese J. Geophys(in Chinese), 1999, 42(1)
2杨文采,方慧,程振炎等。苏鲁超高压变质带北部地球物理调查( ):非地震方法。地球物理学报, 1999, 42(4) (待发表)YANG Wen-Cai, FANG Hui, CHENG Zhen-Yan, et al. Geophysical investigations in northern Sulu UHPMbelt, Part : Non-seismic methods. Chiese J. Geophys. (in Chinese), 1999, 42(4)(in press)
3马杏垣,刘昌栓,刘国栋。江苏响水至内豪古满都拉地学断面,北京:地质出版社, 1986MA Xing-Yuan, LIU Chang-Quan, LIU Guo-Dong. Global Geological Transact from Xiangshui of Jiangsu toMandola of Inner Mongolia. (in Chinese), Beijing: Geological Pub. House, 1986
4金振民,金淑燕,高山等,大别山超高压岩石形成深度局限于100-150km吗?.科学报通, 1998,43(7) : 767-771JIN Zhen-Min, JIN Shu-Yan, GAO Shan, et al. Does the depth of UHPM rock formation in Dabieshan limitto 100-150km?. Chinese Science Bulle., (in Chinese), 1998, 43(7):767-771
5翟明国,从柏林。苏鲁-大别山变质带岩石大地构造学,中国科学(D), 1996,26(3): 258-264ZHAI Ming-Guo, CONG Bo-Lin. Petrotectonics of Sulu-Dabie metamorphic beIt, central and east China.Science in China (in Chinese) (D), 1996, 26(3):258-264
6徐树桐,刘贻灿,江来利等。大别山的构造格局和演化,北京:科学出版社, 1993XU Shu-Tong, LIU Yi-Chan, JIANG Lai-Li, et al. Tectonic Evolution of Dabieshan (in Chinese), Beijing:Science Press, 1993
7 Hacker B R, Sharp T, Zhang R Y, et al. Determining the origen of ultra-high pressure iherzolites. Sciences,1997, 27(10): 702-704
8 Li S G, Wang S S, Chen Y Z, et al. Exess argon in phengite from eclogite. Chem Geol. 1994, 112(7):343-3509 Liou J G, Maruyama S, Ernst W G. Seeing a mountain in a grain of garnet. Sciences, 1997, 27(4):48-49
10 Liou J G, Zhang R Y, Wang X, et al. Metamorphism and tectonics of HP and UHP belts in theDabie-Sulu region China. In: Yin A, Harrsion T M. ed. Tectonic Evolution of Asia. Cambridge Univ. Press.1995, 345-370
11 Yang J, Godard G, Kienast J R, et al. Ultrahigh-pressure (60kbar) Magnetite-bearing garnet periodotites from northeastern Jiangsu, China. J Geol., 1993, 101(11):541-554
12 YANG Wen-Cai. Crustal Structure and development of Sulu UHPM terrane in east-central China. Episodes,1997, 20(2): 100-103
13 YANG Wen-Cai. Crustal Structure and development of Dabie UHPM Terrane in east-central China.Continental Dynamics, 1998, 3(1-2). 86-95
14 Zhang Y. Oxygen and Carbon isotope anomalies in UHPM rocks of Dabie-Sulu terrane. Episodes, 1997,20(2): 104-108
15杨文采。后板块地球内部物理学导论。北京:地质出版社, 1998。YANG Wen-Cai. Post-Plate-Tectonics Physics of Earth's Interior (in Chinese). Beijing: Geological Pub.House, 1998
16许志琴,张巧大,赵民。郯庐断裂带中断大裂谷的基本特征,中国地质科学院院报, 1982,(4): 132-148XU Zhi-Qin, ZHANG Qiao-Da. ZHAO Min. Basic rift characteristics of Tanlu fault zone (in Chinese).Bulletin of the Chinese Academy of Geological Sciences, 1982, (4). 132-148
2杨文采,方慧,程振炎等。苏鲁超高压变质带北部地球物理调查( ):非地震方法。地球物理学报, 1999, 42(4) (待发表)YANG Wen-Cai, FANG Hui, CHENG Zhen-Yan, et al. Geophysical investigations in northern Sulu UHPMbelt, Part : Non-seismic methods. Chiese J. Geophys. (in Chinese), 1999, 42(4)(in press)
3马杏垣,刘昌栓,刘国栋。江苏响水至内豪古满都拉地学断面,北京:地质出版社, 1986MA Xing-Yuan, LIU Chang-Quan, LIU Guo-Dong. Global Geological Transact from Xiangshui of Jiangsu toMandola of Inner Mongolia. (in Chinese), Beijing: Geological Pub. House, 1986
4金振民,金淑燕,高山等,大别山超高压岩石形成深度局限于100-150km吗?.科学报通, 1998,43(7) : 767-771JIN Zhen-Min, JIN Shu-Yan, GAO Shan, et al. Does the depth of UHPM rock formation in Dabieshan limitto 100-150km?. Chinese Science Bulle., (in Chinese), 1998, 43(7):767-771
5翟明国,从柏林。苏鲁-大别山变质带岩石大地构造学,中国科学(D), 1996,26(3): 258-264ZHAI Ming-Guo, CONG Bo-Lin. Petrotectonics of Sulu-Dabie metamorphic beIt, central and east China.Science in China (in Chinese) (D), 1996, 26(3):258-264
6徐树桐,刘贻灿,江来利等。大别山的构造格局和演化,北京:科学出版社, 1993XU Shu-Tong, LIU Yi-Chan, JIANG Lai-Li, et al. Tectonic Evolution of Dabieshan (in Chinese), Beijing:Science Press, 1993
7 Hacker B R, Sharp T, Zhang R Y, et al. Determining the origen of ultra-high pressure iherzolites. Sciences,1997, 27(10): 702-704
8 Li S G, Wang S S, Chen Y Z, et al. Exess argon in phengite from eclogite. Chem Geol. 1994, 112(7):343-3509 Liou J G, Maruyama S, Ernst W G. Seeing a mountain in a grain of garnet. Sciences, 1997, 27(4):48-49
10 Liou J G, Zhang R Y, Wang X, et al. Metamorphism and tectonics of HP and UHP belts in theDabie-Sulu region China. In: Yin A, Harrsion T M. ed. Tectonic Evolution of Asia. Cambridge Univ. Press.1995, 345-370
11 Yang J, Godard G, Kienast J R, et al. Ultrahigh-pressure (60kbar) Magnetite-bearing garnet periodotites from northeastern Jiangsu, China. J Geol., 1993, 101(11):541-554
12 YANG Wen-Cai. Crustal Structure and development of Sulu UHPM terrane in east-central China. Episodes,1997, 20(2): 100-103
13 YANG Wen-Cai. Crustal Structure and development of Dabie UHPM Terrane in east-central China.Continental Dynamics, 1998, 3(1-2). 86-95
14 Zhang Y. Oxygen and Carbon isotope anomalies in UHPM rocks of Dabie-Sulu terrane. Episodes, 1997,20(2): 104-108
15杨文采。后板块地球内部物理学导论。北京:地质出版社, 1998。YANG Wen-Cai. Post-Plate-Tectonics Physics of Earth's Interior (in Chinese). Beijing: Geological Pub.House, 1998
16许志琴,张巧大,赵民。郯庐断裂带中断大裂谷的基本特征,中国地质科学院院报, 1982,(4): 132-148XU Zhi-Qin, ZHANG Qiao-Da. ZHAO Min. Basic rift characteristics of Tanlu fault zone (in Chinese).Bulletin of the Chinese Academy of Geological Sciences, 1982, (4). 132-148
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