Pierre Beck, Olivier Beyssac, Bernard Schmitt, Clement Royer, Lucia Mandon, Eglantine Boulard, Nicolas Rividi, Edward A. Cloutis
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引用次数: 0
摘要
在地球上,碳酸盐矿物被广泛用作其形成地质环境的记录器。在此,我们介绍一种利用红外遥感或拉曼光谱检索碳酸铁镁矿物晶体化学成分的方法。我们分析了一系列特征明确的碳酸铁镁矿物,这些矿物的拉曼光谱是在两个不同的实验室获得的,而红外光谱则是从可见光范围到 25-μm 的反射率和透射率测量的。我们建立了基本振动模式和谐波振动模式位置与 Mg#(定义为 Mg# = 100 × Mg/(Mg + Fe + Ca + Mn))相关性的校准线。通过这些定标,可以在光谱观测的基础上检索 Mg#,典型精度为 10。我们讨论了这些定标的适用性框架,并将其应用于火星尼利窝区碳酸盐的典型 CRISM 光谱。
Quantification of Crystal Chemistry of Fe-Mg Carbonates by Raman Microspectroscopy and Near-Infrared Remote Sensing
On Earth, carbonate minerals are widely used as recorders of the geological environments in which they formed. Here, we present a method designed to retrieve the crystal chemistry of Fe-Mg carbonate minerals using infrared remote sensing or Raman spectroscopy. We analyzed a suite of well-characterized Fe-Mg carbonate minerals for which Raman spectra were obtained in two different laboratories, and IR spectra were measured in reflectance and transmission from the visible range to 25-μm. We built calibration lines for the dependence of fundamental and harmonic vibrational modes position to the Mg# (defined as Mg# = 100 × Mg/(Mg + Fe + Ca + Mn)). These calibrations should enable retrieval of Mg# based on spectroscopic observations with a typical accuracy of 10. We discuss the framework of applicability of these calibrations and apply them to a typical CRISM spectrum of carbonates from the Nilli Fossae region of Mars.
期刊介绍:
Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.