Usual ductile shear zone has relatively high strain magnitude. However,for high-grade metamorphic rocks in Daqingshan area,the related strain is very low with weakly developed lineation. Significantly,the finite strai...Usual ductile shear zone has relatively high strain magnitude. However,for high-grade metamorphic rocks in Daqingshan area,the related strain is very low with weakly developed lineation. Significantly,the finite strain type with a K-value slightly lower than 1 and is characterized by compressional strain. Because the special tectonic environment with high temperature,the percentage of melt is relatively higher,which leads to a series of microscopic phenomenon such as multi-grain quartz bands,feldspar three edges equilibrium-like texture,granular flow,etc. As a consequence,the tectonites in the studied area illustrate a unique character: obvious rheological meso-deformation structure but with very weak intracrystalline micro-deformation.展开更多
基金Supported by Project of National Natural Science Foundation of China(Nos.41230206,41340032)
文摘Usual ductile shear zone has relatively high strain magnitude. However,for high-grade metamorphic rocks in Daqingshan area,the related strain is very low with weakly developed lineation. Significantly,the finite strain type with a K-value slightly lower than 1 and is characterized by compressional strain. Because the special tectonic environment with high temperature,the percentage of melt is relatively higher,which leads to a series of microscopic phenomenon such as multi-grain quartz bands,feldspar three edges equilibrium-like texture,granular flow,etc. As a consequence,the tectonites in the studied area illustrate a unique character: obvious rheological meso-deformation structure but with very weak intracrystalline micro-deformation.
