Study of Thermal Infrared Spectra Features of Typical Sedimentary.Rocks from Kalpin Uplift in Tarim Basin
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摘要: 塔里木盆地西北缘柯坪隆起一些典型碎屑岩、碳酸盐岩及蒸发岩的热红外发射光谱曲线的分析表明：利用残余辐射谱带（又叫低发射率带）的中心波长位置可以确定沉积岩中的主要矿物成份，并可利用残余辐射谱带的强度判断矿物成份含量的多少。这对于利用热红外多光谱遥感技术直接找矿具有重要意义。Abstract: The research results of laboratory thermal infrared emissivity spectra of some typical clastic rocks, argillacous rocks, carbonate rocks and evaporite collected from ICalpin 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 8 and l0μm，which results from interatomic stretching vibrations of silicon and oxygen bound in the crystal lattice. The band center has 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 band 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 composition 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 wavelengths of restrahlen band (or low emissivity band)of sedimentary rocks, the relevant bands 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 band 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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