壳内部分熔融低速层及其研究意义

THE LOW VELOCITY ZONE RESULTED FROM CRUSTAL PARTIAL MELTING AND ITS SIGNIFICANCE

实验岩石学、岩石地球物理学、地质学及理论分析均表明，至少在具有高热流值的区段，部分熔融作用可能是造成壳内低速带的主要原因．我们将由部分熔融作用所形成的壳内低速层称之为壳内部分熔融低速层．它是许多深部地质作用的发源和汇聚地，并影响和制约着地球物理场特征．因此，研究壳内部分熔融低速带的形成及其地质意义无疑将深化人们对深部地质作用发生和发展过程的认识．

The evidences coming from experimental petrology,petrophysics,geology and theoretical analysis indicate that,at least in high geothermal area,the crustal partial melting is the main process to form the crustal low velocity zone. Recent research results show that the low velocity zone not only is a place of origin and convergence of many deep geological processes,but also has an important effect on the characteristics of geophysical field. There is no doubt that the researches of how the zone forms,and of what significance it has are very useful for scientists to understand the occurrence and evolution of deep geological processes.