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Study of Thermal Infrared Spectra Features of Typical Sedimentary,Rocks from Kalpin Uplift in Tatim Basin

Fu Bihong;Chou Xiaowei (Lanzhou Institute of Geology,Chinese Academy Sciencs)  
The research results of labotatory thermal infrared emissivity spectra of some typical elastic rocks, argillacous rocks, carbonate rocks and evaporite collected from Kalpin Uplift in Tarim Basin,integrated with the results of chemical anelysis, X-ray diffraction and thin section identification of rocks indcate that clastic rocks and argillaceous rocks with quartz have restrahlen band between 8and 10μm, which results from niteratomic stretching vibrations of Silicon and oxygen bound in the crystal lattice. The band center ha been shown to move to longer wavelengths and decrease in intensity with decreasing quartz content.Carbonate rocks exhibit low emissivity band at 11.3μm due to C-O bending modes, the hand center shown to move to shorter wavelengths with increasing Mg2+ content, and gypsum has an intense low emissity band near 8. 56μm caused by fundmental stretching motions of sulfate ion. The rock type, mineralogical compeition and content of sedimentary rocks can be determined according to these features.The analyses of thermal infrared spectra features of sedimentary rocks provide a theoretical basis for thermal infrared multispectral remote sensing. According to the center warelengths of restrahlen band (or low emissivity thed)of sedimentary rocks, the relevant theds can be selected for airborne and spaceborne thermal infrared multispectral scanners (TIMS ) to extract and distinguish the lithologic and mineralogic information. For example, 8. 13μm, 9. 17μm, 11. 3μm and 8. 56μm,etc. are the best hand center for TIMS scanner.The TIMS will become a powerful new geologic remote sensing tool that can provide rich lithologic and mineralogic information in the future.
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