地幔过渡带顶部低速层地震学研究进展
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摘要
地幔过渡带顶部低速层的存在、结构、成分、成因及其动力学稳定性对理解地球内部物质运动、化学分异、板块俯冲、地幔柱起源、板内火山、地幔对流模式和地球演化等深部物理化学过程具有非常重要作用.由于其厚度薄且横向变化剧烈,致使其地震学探测十分困难,再加上数据的限制,有关该低速层探测的研究不是很多,该低速层的结构、全球分布及形成原因等仍然存在很大争议.基于此,本文概述了该低速层的研究进展及存在问题,介绍了各种地震学探测方法在该低速层应用上的优缺点,总结了中国大陆及其沿海地区地幔过渡带顶部低速层研究取得的成果及不足,并探讨了未来工作方向.
The existence,structure,composition,formation and dynamic stability of the Low-Velocity Layer( LVL) atop the Mantle Transition Zone( MTZ) is very important to understand the internal material movement, chemical differentiation, plate subduction,mantle plume origin,intraplate volcano,mantle convection,earth deep evolution and related physical and chemical processes.Because of thin thickness and sharp changes, seismological detection of the LVL has proved difficult. The seismological structure,global distribution and formation of the LVL are still controversy. Based on these,firstly,research progress of the LVL is summarized in this paper. Secondly,we introduced the advantages and disadvantages of various seismological methods in the application of the LVL. Finally, we described in detail the achievements and shortcomings of the LVL and discussed the direction of future work beneath China and surrounding areas.
The existence,structure,composition,formation and dynamic stability of the Low-Velocity Layer( LVL) atop the Mantle Transition Zone( MTZ) is very important to understand the internal material movement, chemical differentiation, plate subduction,mantle plume origin,intraplate volcano,mantle convection,earth deep evolution and related physical and chemical processes.Because of thin thickness and sharp changes, seismological detection of the LVL has proved difficult. The seismological structure,global distribution and formation of the LVL are still controversy. Based on these,firstly,research progress of the LVL is summarized in this paper. Secondly,we introduced the advantages and disadvantages of various seismological methods in the application of the LVL. Finally, we described in detail the achievements and shortcomings of the LVL and discussed the direction of future work beneath China and surrounding areas.
引文
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Leahy G M,Bercovici D.2007.On the dynamics of a hydrous melt layer above the transition zone[J].Journal of Geophysical Research,112(B7):B07401,doi:10.1029/2006JB004631.
Li C,Van Der Hilst R D.2010.Structure of the upper mantle and transition zone beneath Southeast Asia from traveltime tomography[J].Journal of Geophysical Research,115(B7):B07308.
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Li G,Sui Y,Zhou Y.2014.Low-velocity layer atop the mantle transition zone in the lower Yangtze Craton from P waveform triplication.Chinese Journal of Geophysics(in Chinese)[J],57(7):2362-2371.
Li J,Wang X,Wang X J,et al.2013.P and SH velocity structure in the upper mantle beneath Northeast China:Evidence for a stagnant slab in hydrous mantle transition zone.Earth and Planetary Science Letters,367:71-81.
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Li Y H,Wu Q J,An Z H,et al.2006.The Poisson ratio and crustal structure across the NE Tibetan Plateau determined from receiver functions.Chinese Journal of Geophysics(in Chinese)[J],49(5):1359-1368.
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