摘要
本文较为详细地研究了粤西深层次推覆构造带中岩石的垂向分带性,一是从外来系统—滑动系统—原地系统的垂向分带性;二是滑动系统内部从糜棱岩带—混合岩带—花岗岩带的垂向分带性;三是糜棱岩带、混合岩带内部的岩石垂向分带性。通过对矿物变形构造、剪切带摩擦生热及熔体强化变形的综合研究,讨论了滑动系统的复杂性与深层次推覆过程的动力变质作用和部分熔融的关系,强调了带中混合岩是由糜棱岩改造而成,花岗岩则可能是混合岩化的最终产物。
Through the field work and lab studies on the deep-level nappe structure inwestern Guangdong, the authors believe that the slip system of vertical zonation ofmylonites--migmatites--granites was generated by dynamometamorphism and partialmelting in the process of deep--level oveithrusting. The genetic relationships ofmylonite, migmatite and granite are also discussed through studies of deformationstructure, frictional heating (shear strain heating) and melt--enhanced deformation.The authors emphasize that in the process of deep--level overthrusting, myloniteswere generated first and migmatites were reformed from mylonites, while graniteswere the possible final product of the migmatization.
出处
《地质论评》
CAS
CSCD
北大核心
1992年第5期407-413,T001,共8页
Geological Review
基金
国家自然科学基金(编号9488010)
关键词
糜棱岩
混合岩
花岗岩
成因
vertical zonation of the rocks
shear strain heat
partial melting
melt-enhanced deformation
