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首页> 外文期刊>Planetary and space science >Advantages of first-derivative reflectance spectroscopy in the VNIR-SWIR for the quantification of olivine and hematite
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Advantages of first-derivative reflectance spectroscopy in the VNIR-SWIR for the quantification of olivine and hematite

机译：vnir-swir中​​的第一衍生物反射光谱的优点，用于定量橄榄石和赤铁矿

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The focus of this paper is to study the application of the first order derivative method for the estimation of minerals rates in different mineral mixtures. The primary goal with this is to find robust spectral features of specific minerals that are not severely influenced by the spectral features of the other minerals in a mixture. Results were used to select appropriate spectral features to be applied for quantifying the minerals in upcoming studies. Mixtures of different terrestrial minerals equivalent to those dominating the Martian surface with a grain size 0.25 mm were prepared and analyzed in the laboratory by reflectance spectroscopy in the VNIR-SWIR range. The first derivatives were computed and correlated with the mineral concentration at specific wavelengths using the Unscrambler X software. The results indicated the first derivatives near 2300 nm, that is a characteristic absorption feature of olivine rich in magnesium and iron silicate, correlate strongly to the olivine content for all the mixtures containing olivine, binary and ternary, with regression coefficients ranging between 0.93 and 0.98. Additionally, the main advantage of this work is that first derivative spectra of mixtures with different olivine ratio highlights in the overlapping regions of the spectra the wavelengths where the first derivative values correlate strongly to the amount of olivine in the mixtures. The region near 1050-1300 nm was identified as a promising one for hematite-olivine mixtures and 785-900 nm for magnetite olivine, with a regression coefficient mean of 0.97 and 0.98, respectively. The study of hematite-plagioclase mixtures demonstrates that wavelengths near 785-858 nm and 940-989 nm lying within the overlapping regions of hematite and plagioclase exhibit robust correlation to the hematite content with a regression coefficient mean of 0.98 for both areas.
机译：本文的重点是研究一种阶梯衍生法在不同矿物混合物中估算矿物质率的应用。其中的主要目标是寻找特定矿物质的强大光谱特征，这些矿物质不会受到混合物中其他矿物质的光谱特征的严重影响。结果用于选择适当的光谱特征，以用于量化即将到来的研究中的矿物质。在VNIR-SWIR范围内通过反射光谱法制备并在实验室中制备不同陆地矿物的混合物，并在实验室中分析了实验室。使用UNSCRAMBLER X软件计算并将第一衍生物与特定波长的矿物浓度相关。结果表明，2300nm附近的第一衍生物，即富含镁和硅酸盐的橄榄石的特征吸收特征，对含有橄榄石，二元和三元的所有混合物的橄榄石含量强烈地相关，其中回归系数在0.93和0.98之间。 。另外，这项工作的主要优点是具有不同橄榄胺比的混合物的第一衍生光谱在光谱的重叠区域中突出显示，其中第一衍生值强烈地与混合物中的橄榄石的量相关的波长。将1050-1300nm接近的区域被鉴定为赤铁矿 - 橄榄石混合物的有希望的一个，磁铁矿橄榄石的785-900nm，分别为0.97和0.98的回归系数平均值。赤铁矿 - Plagioclase混合物的研究表明，位于赤铁矿和Plagioclase的重叠区域内的785-858nm和940-989nm附近的波长与两个区域的回归系数平均值为0.98的赤铁矿含量稳健相关。

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