Structural analysis of the fracture surface of a heterogeneous body (quartz sandstone) |
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| Authors: | V I Vettegren’ R I Mamalimov V B Kulik A V Patonin A V Ponomarev G A Sobolev I P Shcherbakov |
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| Institution: | 1.Ioffe Institute,Russian Academy of Sciences,St. Petersburg,Russia;2.Borok Geophysical Observatory, Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Borok, Yaroslavl oblast,Russia;3.Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The structure of surface layers of quartz sandstone with a thickness of ~1 μm before and after destruction by a compressive stress is studied by methods of infrared, photoluminescent, and Raman spectroscopy. Before destruction, this layer contained quartz grains cemented with montmorrillonite and kaolinite. The grains are covered with a thin water layer and have crystallographic defects: Si–O–, self-trapped excitons, AlOH and LiOH compounds, AlO4]– centers, etc. The destructed surface contains separate quartz grains with sizes of ~2 μm and a reduced defect concentration. It is assumed that the defects reduce the strength of quartz grains, which are destroyed in the first turn. |
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