大别超高压榴辉岩高温高压下地震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
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摘要
<正>深部岩石高温高压下物理性质是制约地球物理测深成果解释、建立岩石圈物质组成和结构模式、探讨超高压变质带俯冲和折返机制的先决条件,也是大陆科学钻探先行研究的重要基础性工作.地震各向异性(Seismic anisotropy)和S波分裂(Shear wave splitting)研究已成为揭示岩石圈动力学机制的新方向,但目前有关超高压岩石的实验数据尚十分缺乏例如,目前国际上对榴辉岩地震波速实验研究最详细的成果应属Fountain等1994年对挪威加里东造山带榴辉岩的研究,该研究系统测定了至600MPa不同压力下榴辉岩和有关麻粒岩的P波速度和波速各向异性,但未研究S波以及温度对波速的影响.本文报道了大别超高压榴辉岩及其围岩在高温高压和组构定向条件下精确测定地震P波、S波、波速各向异性、S波分裂、泊松比、密度和体积变化的初步成果,探讨了实验结果在大别超高压带深部结构、组成和莫霍面性质研究中的意义.
引文
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[3]Christensen N I,Mooney W D. Seismic velocity structure and composition of the continental crust:a global vicw Journal of Geophysical Research.1995.100(B7):9761～9788
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[5]Rudnick R L,Fountain D M.Nature and composition of the continental crust:a lower crustal perspective.Reviews of Geophysics,1995,33(3):267～309
[6]McNamara D E,Owens T J,Silver P G,et al.Shear wave anisotropy beneath the Tibetan Plateau.Journal of Geophysical Research,1994,99(B7):13655～13665
[7]Fountain D M,Boundy T M.Austrheim H,et al.Eclogite facies shear zone-deep crustal reflectors? Tectonophysics,1994,232:411～424
[8]Fountain D M,Christensen N I.Composition of the continental crust and upper mantle:a review.In:Pakiser L C,Mooney W D,eds.Geophysical Framework of the Continental United States.Boulder,coloraclo:Geological Society of America Memoir172,1989.711～742
[9]国家地震局地学断面编委会.青海门源至福建宁建地学断面.北京:地震出版社.1992
[10]王椿镛,林中洋,陈学波.青海门源-福建宁德地学断面综合地球物理研究.地球物理学报,1995,5:590～598
[11]国家地震局地学断面编委会.江苏响水至内蒙古满都拉地学断面.北京:地质出版社,1991
[12]Chapman D S.Thermal gradients in the continental crust.In:Dawson J B,Carswell D A,Hall J,eds.The Nature of the Lower Continental Crust,Oxford:Blackwell,1986.63～70
[13]Mengel K,Kern H.Evolution of the petrological and seismic Moho-implications for the continental crust-mantle boundary.Terra Nova,1992,4:109～116
[2]Kern H,Gao S,Liu Q.Seismic properties and densities of middle and lower crustal rocks exposed along the North China Geoscience Transect Earth and Planetary Science Letters,1996,139:439～455
[3]Christensen N I,Mooney W D. Seismic velocity structure and composition of the continental crust:a global vicw Journal of Geophysical Research.1995.100(B7):9761～9788
[4]Cloos M.Lithospheric bouyancy and collisional orogensis:subduction of oceanic plateaus,continental margins,island arcs,spreading ridges and seamounts.Geological Society of American Bulletin,1993,105:715～737
[5]Rudnick R L,Fountain D M.Nature and composition of the continental crust:a lower crustal perspective.Reviews of Geophysics,1995,33(3):267～309
[6]McNamara D E,Owens T J,Silver P G,et al.Shear wave anisotropy beneath the Tibetan Plateau.Journal of Geophysical Research,1994,99(B7):13655～13665
[7]Fountain D M,Boundy T M.Austrheim H,et al.Eclogite facies shear zone-deep crustal reflectors? Tectonophysics,1994,232:411～424
[8]Fountain D M,Christensen N I.Composition of the continental crust and upper mantle:a review.In:Pakiser L C,Mooney W D,eds.Geophysical Framework of the Continental United States.Boulder,coloraclo:Geological Society of America Memoir172,1989.711～742
[9]国家地震局地学断面编委会.青海门源至福建宁建地学断面.北京:地震出版社.1992
[10]王椿镛,林中洋,陈学波.青海门源-福建宁德地学断面综合地球物理研究.地球物理学报,1995,5:590～598
[11]国家地震局地学断面编委会.江苏响水至内蒙古满都拉地学断面.北京:地质出版社,1991
[12]Chapman D S.Thermal gradients in the continental crust.In:Dawson J B,Carswell D A,Hall J,eds.The Nature of the Lower Continental Crust,Oxford:Blackwell,1986.63～70
[13]Mengel K,Kern H.Evolution of the petrological and seismic Moho-implications for the continental crust-mantle boundary.Terra Nova,1992,4:109～116
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