Multiscale spectral discrimination of poorly crystalline and intermixed alteration phases using aerial and ground-based ExoMars rover emulator data
Multiscale spectral discrimination of poorly crystalline and intermixed alteration phases using aerial and ground-based ExoMars rover emulator data
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使用航空和地面 ExoMars 漫游器仿真器数据对不良结晶和混合蚀变相进行多尺度光谱辨别
DOI：
10.1016/j.icarus.2021.114541
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发表时间：
2021
期刊：
影响因子：
3.2
通讯作者：
Allender E
中科院分区：
文献类型：
--
作者：
Allender E
ExoMars漫游者Rosalind Franklinis的一个关键目标是使用全景多尺度和多光谱图像分析可访问的水合矿物沉积物。我们进行了多尺度的光谱研究，在冰岛北方的Námafjall地热区的热液蚀变玄武岩托管的土壤。经历了一级地球化学蚀变的玄武质熔岩在这里产生了各种厘米到米尺度的结晶度差的蚀变图案。由此产生的未固结沉积物提供了一个天然的模拟材料，调查密切混合土壤，包括多个不良结晶水化相。我们使用模拟器仪器复制ExoMars 2022全景相机（PanCam），ExoMars红外光谱仪（ISEM）和Close-UP成像仪（CLUPI）的功能，以及拉曼，航空和X射线荧光光谱数据，以研究这些混合玄武岩衍生蚀变阶段的检测如何随空间和光谱尺度而变化。我们发现，在我们的研究地点的土壤是由松散的沉积物，包括铝-OH矿物，水合二氧化硅，和各种氧化铁，所有这些罗莎琳德富兰克林将可能遇到沿着其遍历在Oxia Planum。我们报告（一）火星探测器仪器模拟器之间的协同作用和限制，作为使命准备的一个组成部分，（二）如何混合性质的这些水热蚀变土壤影响矿物学解释在多个尺度，和（iii）地球化学推断，可以使用ExoMars 2022成像模拟器。
A key goal of the ExoMars roverRosalind Franklinis to analyze accessible hydrated mineral deposits using panoramic multiscale and multispectral imagery. We conducted a multiscale spectroscopic study on hydrothermally-altered basalt-hosted soils in the geothermal area of Námafjall in northern Iceland. Basaltic lavas here that have experienced first-order geochemical alteration produce a variety of cm-to-meter scale poorly crystalline alteration patterns. The resulting unconsolidated sediments provide a natural analogue material to investigate intimately mixed soils comprising multiple poorly crystalline hydrated phases. We use emulator instruments which replicate the capabilities of the ExoMars 2022 Panoramic Camera (PanCam), the Infrared Spectrometer for ExoMars (ISEM), and the CLose-UP Imager (CLUPI), alongside Raman, aerial, and X-Ray Fluorescence spectroscopic data to investigate how the detection of these mixed basalt-derived alteration phases varies as a function of spatial and spectral scale. We find soils at our study site to be comprised of unconsolidated sediments including Al-OH minerals, hydrated silica, and a variety of ferric oxides, all of whichRosalind Franklinwill likely encounter along its traverse at Oxia Planum. We report on (i) the synergy and limitations between Mars rover instrument emulators as an integral part of mission preparation, (ii) how the mixed nature of these hydrothermally-altered soils affects resulting mineralogical interpretations at multiple scales, and (iii) geochemical inferences that can be made using ExoMars 2022 imaging emulators.