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Global Geology 2016, 19(2) 69-77 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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Genesis of lower strain S- L- type tectonites in Daqingshan area��Inner Mongolia |
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SHAO Yilun, LIU Yongjiang, JIA Jie, LI Weimin and JIN Wei |
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1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� China- Japan Union Hospital of Jilin University��Changchun 130033��China |
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Abstract��
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 fi- nite 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 tex- ture��granular flow��etc�� As a consequence��the tectonites in the studied area illustrate a unique character: ob- vious rheological meso- deformation structure but with very weak intracrystalline micro- deformation�� |
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Keywords��
Daqingshan area
high- grade metamorphic rocks
deformation
strain
partial melting
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Received Revised Online: |
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