苏鲁地区地壳岩浆底侵的地球物理判识
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摘要
底侵作用是研究壳幔物质交换与大陆增生演化的重要机制之一,但是对岩浆底侵作用的判识是十分困难的科学问题。中国大陆科学钻探先行项目在苏鲁地区积累的地震学、地热学及地电学资料表明,在苏鲁地区发生过与大陆裂谷同期的地幔岩浆底侵作用,发生的时段主要为始新世,它的发育与沿嘉山—响水大陆裂谷带在时空上有密切联系。这里的壳幔过渡带厚度可达3 km,推测为橄榄岩与基性麻粒岩互层。结合岩石学资料可以推算出由岩浆底侵作用造成大陆地壳增厚的平均速率约为0.1 mm/a。
Magmatic underplating is an important process in the interaction between the crust and mantle and for un-derstanding continental accretion. However, identification of underplating process is a very difficult task. Based on seismic, geothermal and geoelectrical data collected during the site-selection investigations for the Chinese continental scientific drilling project, it is inferred that an event of magmatic underplating occurred accompany-ing the Jiashan-Xiangshui continental rift system in the Eogene Period. This magmatic underplating process had the same heat origin with the rift system. The thickness of the transition zone between the crust and the mantle is about 3 km and composition of the zone might be the interbed of peridotite and basic granulites. To-gether with the data of basalts in the area, it is estimated that the average rate of vertical thickening of the con-tinental crust owing to the magmatic underplating is about 0. 1 mm/year.
Magmatic underplating is an important process in the interaction between the crust and mantle and for un-derstanding continental accretion. However, identification of underplating process is a very difficult task. Based on seismic, geothermal and geoelectrical data collected during the site-selection investigations for the Chinese continental scientific drilling project, it is inferred that an event of magmatic underplating occurred accompany-ing the Jiashan-Xiangshui continental rift system in the Eogene Period. This magmatic underplating process had the same heat origin with the rift system. The thickness of the transition zone between the crust and the mantle is about 3 km and composition of the zone might be the interbed of peridotite and basic granulites. To-gether with the data of basalts in the area, it is estimated that the average rate of vertical thickening of the con-tinental crust owing to the magmatic underplating is about 0. 1 mm/year.
引文
池际尚.1988． 中国东部新生代玄武岩及上地幔研究.武汉:中国地质大学出版社.
胡振远,杨文采,程振炎,等.2000． 苏鲁大陆科学钻探靶区深反射地震叠前深度偏移.地球物理学报,43(4) :488～498．
汪集肠,胡圣标,杨文采,等.2001a.中国大陆科学钻探先导孔地热测量.科学通报,46(10) :847～850．
汪集面,胡圣标,杨文采,等.2001b.中国大陆科学钻探靶区深部温度预测.地球物理学报,44(6) :774～782．
杨文采,程振炎,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,等.1999b.郯城一涟水综合地球物理长剖面.地球物理学报,42(2) :206～217．
杨文采,程振炎,等.1999c.苏鲁超高压变质北带的地球物理调查(Ⅱ)--综合地球物理方法.地球物理学报,42(4) :508～519
杨文采.2001． 从地球物理资料看大别-苏鲁超高压变质带演化的运动学与动力学.地球物理学报,44(3) :61～75．
Caress D W. 1995． Seismic imeging of hotspot-related crustal underplating beneath the Marquesas Island. Nature, 373: 600～603．
Chi Jishang. 1988． The study of Cenozoic basalts and upper mantle beneath eastern China. Wuhan: China University of Geosciences Press (in Chinese).
Cox K G. 1980． A model for flood basalt volcanism. J. Petrol., 21:629～650．
Deemer S L, Hurich C A. 1994． The reflectivity of magmatic underplating using the layered mafic intrusion analog. Tectonophysics,232: 239～255．
Drummond B J,Colons C D N. 1986． Seismic evidence for underplating of the lower continental crust of Australia. Earth Planet Sci. Lett.,79: 361～372．
Durrheim R J, Mooney W D. 1991． Archean and Proterozoic crustal evolution: evidence from crustal seismology. Geology, 19: 606～609．
Fountain D M, Arculus R, Key R W. 1992． Continental Lower Crust. Elsevier, Amsterdam-London.
Fyfe W S, Leonardos O H. 1973． Ancient metamorphic-magmatite belts of the Brazilian African coasts. Nature, 224: 501～502．
Furlong K P, Fountain D M. 1986． Continental crustal underplating; Thermal considerations and seismic-petrologic consequences. Journal of Geophysical Research, 91: 8285～8294．
Hu S,He L,Wang J. 2000． Heat flow in the continental area of China:a new data set. Earth Planet. Sci. Letter, 179 (2) : 407～419．
Klemperer S L. 1989． Deep seismic reflection profiling and the growth of the continental crust. Tectonophysics, 161: 232～244．
Pollack H N, Hurter S J, Johnson J R. 1993． Heat flow from the Earth's interior: analysis of the global data set. Rev. Geophys., 31: 267～280．
Wang J, Hu S, Yang W. 2001a. Geothermal measurements in the prepilot holes of the Chinese continental scientific drilling. Chinese Sci. Bull., 46(10) : 847～850 (in Chinese).
Wang J, Hu S, Yang W. 2001b. Prediction of the deep temperature in the target area of the China continental scientific drilling. Chinese J. Geophys., 44 (6) : 774～782 (in Chinese with English abstract).
White R S, Spence G D, Fowler S R, et al. 1987． Magmatism at rifted continental margins. Nature, 330: 439～444．
Xu Zhiqin, Yang Wencai, Cong Bolin. 1998a. Drilling Operations of the Dabie-Sulu UHPM Belt, East China. Proposal to ICDP, Potsdam, Germany,1～68．
Xu Zhiqin, Yang Wencai. 1998b. Scientific Significance and Site-se-lection Researches of the First Chinese Continental Scientific Deep Drilling. Continental Dynamics, 3 (1～2 ): 1～13．
Yang Wencai. 1997． Crustal structure and development of Sulu UHPM Terrane in East-Central China. Episodes, 20(2) : 40～43．
Yang Wencai. 1998． Crustal structure and development of Dabie UHPM Terrane in East-Central China. Continental Dynamics, 3(1～2) : 86～95．
Yang Wencai, Cheng Zhenyan, Chen Guojiu, et al. 1999a. Geophysical investigations of northern Sulu UHPM belt (I): Deep seismic reflection. Chinese J. Geophysics, 42 (1) : 57～70 (in Chinese with English abstract).
Yang Wencai, Hu Zhenyuan, Cheng Zhenyan, et al. 1999b. Long profile of geophysical investigations from Tancheng to Lianshui,east-central China. Chinese J. Geophysics, 42(2) : 206～217 (in Chinese with English abstract).
Yang Wencai, Feng Hui, Cheng Zhenyan, et al. 1999c. Geophysical investigations of northern Sulu UHPM belt (Ⅱ): Non-seismic methods. Chinese J. Geophysics, 42 (3) : 387～398 (in Chinese with English abstract).
Yang Wencai. 2000． Analysis of deep intracontinental subduction.Episodes, 23 (1) : 20～24．
胡振远,杨文采,程振炎,等.2000． 苏鲁大陆科学钻探靶区深反射地震叠前深度偏移.地球物理学报,43(4) :488～498．
汪集肠,胡圣标,杨文采,等.2001a.中国大陆科学钻探先导孔地热测量.科学通报,46(10) :847～850．
汪集面,胡圣标,杨文采,等.2001b.中国大陆科学钻探靶区深部温度预测.地球物理学报,44(6) :774～782．
杨文采,程振炎,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,等.1999b.郯城一涟水综合地球物理长剖面.地球物理学报,42(2) :206～217．
杨文采,程振炎,等.1999c.苏鲁超高压变质北带的地球物理调查(Ⅱ)--综合地球物理方法.地球物理学报,42(4) :508～519
杨文采.2001． 从地球物理资料看大别-苏鲁超高压变质带演化的运动学与动力学.地球物理学报,44(3) :61～75．
Caress D W. 1995． Seismic imeging of hotspot-related crustal underplating beneath the Marquesas Island. Nature, 373: 600～603．
Chi Jishang. 1988． The study of Cenozoic basalts and upper mantle beneath eastern China. Wuhan: China University of Geosciences Press (in Chinese).
Cox K G. 1980． A model for flood basalt volcanism. J. Petrol., 21:629～650．
Deemer S L, Hurich C A. 1994． The reflectivity of magmatic underplating using the layered mafic intrusion analog. Tectonophysics,232: 239～255．
Drummond B J,Colons C D N. 1986． Seismic evidence for underplating of the lower continental crust of Australia. Earth Planet Sci. Lett.,79: 361～372．
Durrheim R J, Mooney W D. 1991． Archean and Proterozoic crustal evolution: evidence from crustal seismology. Geology, 19: 606～609．
Fountain D M, Arculus R, Key R W. 1992． Continental Lower Crust. Elsevier, Amsterdam-London.
Fyfe W S, Leonardos O H. 1973． Ancient metamorphic-magmatite belts of the Brazilian African coasts. Nature, 224: 501～502．
Furlong K P, Fountain D M. 1986． Continental crustal underplating; Thermal considerations and seismic-petrologic consequences. Journal of Geophysical Research, 91: 8285～8294．
Hu S,He L,Wang J. 2000． Heat flow in the continental area of China:a new data set. Earth Planet. Sci. Letter, 179 (2) : 407～419．
Klemperer S L. 1989． Deep seismic reflection profiling and the growth of the continental crust. Tectonophysics, 161: 232～244．
Pollack H N, Hurter S J, Johnson J R. 1993． Heat flow from the Earth's interior: analysis of the global data set. Rev. Geophys., 31: 267～280．
Wang J, Hu S, Yang W. 2001a. Geothermal measurements in the prepilot holes of the Chinese continental scientific drilling. Chinese Sci. Bull., 46(10) : 847～850 (in Chinese).
Wang J, Hu S, Yang W. 2001b. Prediction of the deep temperature in the target area of the China continental scientific drilling. Chinese J. Geophys., 44 (6) : 774～782 (in Chinese with English abstract).
White R S, Spence G D, Fowler S R, et al. 1987． Magmatism at rifted continental margins. Nature, 330: 439～444．
Xu Zhiqin, Yang Wencai, Cong Bolin. 1998a. Drilling Operations of the Dabie-Sulu UHPM Belt, East China. Proposal to ICDP, Potsdam, Germany,1～68．
Xu Zhiqin, Yang Wencai. 1998b. Scientific Significance and Site-se-lection Researches of the First Chinese Continental Scientific Deep Drilling. Continental Dynamics, 3 (1～2 ): 1～13．
Yang Wencai. 1997． Crustal structure and development of Sulu UHPM Terrane in East-Central China. Episodes, 20(2) : 40～43．
Yang Wencai. 1998． Crustal structure and development of Dabie UHPM Terrane in East-Central China. Continental Dynamics, 3(1～2) : 86～95．
Yang Wencai, Cheng Zhenyan, Chen Guojiu, et al. 1999a. Geophysical investigations of northern Sulu UHPM belt (I): Deep seismic reflection. Chinese J. Geophysics, 42 (1) : 57～70 (in Chinese with English abstract).
Yang Wencai, Hu Zhenyuan, Cheng Zhenyan, et al. 1999b. Long profile of geophysical investigations from Tancheng to Lianshui,east-central China. Chinese J. Geophysics, 42(2) : 206～217 (in Chinese with English abstract).
Yang Wencai, Feng Hui, Cheng Zhenyan, et al. 1999c. Geophysical investigations of northern Sulu UHPM belt (Ⅱ): Non-seismic methods. Chinese J. Geophysics, 42 (3) : 387～398 (in Chinese with English abstract).
Yang Wencai. 2000． Analysis of deep intracontinental subduction.Episodes, 23 (1) : 20～24．
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