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Mid‐infrared reflectance spectroscopy of aubrite components
Meteoritics and Planetary Science ( IF 2.2 ) Pub Date : 2020-09-21 , DOI: 10.1111/maps.13568
Andreas Morlok 1 , Iris Weber 1 , Aleksandra N. Stojic 1 , Martin Sohn 2 , Addi Bischoff 1 , Dayl Martin 3 , Harald Hiesinger 1 , Joern Helbert 4
Affiliation  

Aubrites Peña Blanca Spring and Norton County were studied in the mid‐infrared reflectance as part of a database for the MERTIS (Mercury Radiometer and Thermal Infrared Spectrometer) instrument on the ESA/JAXA BepiColombo mission to Mercury. Spectra of bulk powder size fractions from Peña Blanca Spring show enstatite Reststrahlen bands (RB) at 9 µm, 9.3 µm, 9.9 µm, 10.4 µm, and 11.6 µm. The transparency feature (TF) is at 12.7 µm, the Christiansen feature (CF) at 8.1–8.4 µm. Micro‐FTIR of spots with enstatite composition in Norton County and Peña Blanca Spring shows four types: Types I and II are similar to the bulk powder spectra but vary in band shape and probably display axis orientation. Type III has characteristic strong RB at 9.2 µm, 10.4 µm, and 10.5 µm, and at 11.3 µm. Type IV is characterized by a strong RB at 10.8−11.1 µm. Types III and IV could show signs of incipient shock metamorphism. Bulk results of this study confirm earlier spectral studies of aubrites that indicate a high degree of homogeneity and probably make the results of this study representative for spectral studies of an aubrite parent body. Spectral types I and II occur in all mineralogical settings (mineral clasts, matrix, melt, fragments in melt vein), while spectral type III was only observed among the clasts, and type IV in the melt. Comparison with surface spectra of Mercury does not obtain a suitable fit, only type IV spectra from quenched impact glass show similarity, in particular the 11 µm feature. Results of this study will be available upon request or via the IRIS database (Münster) and the Berlin Emissivity Database (BED).

中文翻译:

奥氏体成分的中红外反射光谱

作为对ESA / JAXA BepiColombo的水星飞行任务的MERTIS(水银辐射计和热红外光谱仪)仪器的数据库的一部分,研究了奥贝里斯·佩尼亚·布兰卡·斯普林和诺顿县的中红外反射率。来自PeñaBlanca Spring的散装粉末粒度级分的光谱显示顽辉石Reststrahlen带(RB)分别为9 µm,9.3 µm,9.9 µm,10.4 µm和11.6 µm。透明特征(TF)为12.7 µm,克里斯琴森特征(CF)为8.1–8.4 µm。诺顿县和佩尼亚·布兰卡·斯普林斯具有顽辉石成分的斑点的Micro-FTIR显示四种类型:I型和II型与粉末粉末光谱相似,但带形不同并且可能显示轴方向。III型在9.2 µm,10.4 µm和10.5 µm以及11.3 µm处具有很强的RB特性。IV型的特点是在10.8-11.1 µm处具有很强的RB。III型和IV型可能显示出初期冲击变质的迹象。这项研究的大部分结果证实了早期的aubrite光谱研究表明其具有高度的同质性,并可能使本研究的结果具有代表性。光谱类型I和II出现在所有矿物学环境中(矿物碎屑,基质,熔体,熔体脉中的碎片),而光谱类型III仅在碎屑中观察到,而IV型仅出现在熔体中。与水星的表面光谱进行比较无法获得合适的拟合度,只有淬火的冲击玻璃的IV型光谱显示出相似性,尤其是11 µm的特征。可以根据要求或通过IRIS数据库(明斯特)和柏林发射率数据库(BED)获得研究结果。这项研究的大部分结果证实了早期的aubrite光谱研究表明其具有高度的同质性,并且可能使本研究的结果具有代表性。光谱类型I和II出现在所有矿物学环境中(矿物碎屑,基质,熔体,熔体脉中的碎片),而光谱类型III仅在碎屑中观察到,而IV型仅在熔体中观察到。与水星的表面光谱进行比较无法获得合适的拟合度,只有淬火的冲击玻璃的IV型光谱显示出相似性,尤其是11 µm的特征。可以根据要求或通过IRIS数据库(明斯特)和柏林发射率数据库(BED)获得研究结果。这项研究的大部分结果证实了早期的aubrite光谱研究表明其具有高度的同质性,并可能使本研究的结果具有代表性。光谱类型I和II出现在所有矿物学环境中(矿物碎屑,基质,熔体,熔体脉中的碎片),而光谱类型III仅在碎屑中观察到,而IV型仅在熔体中观察到。与水星的表面光谱进行比较无法获得合适的拟合度,只有淬火的冲击玻璃的IV型光谱显示出相似性,尤其是11 µm的特征。可以根据要求或通过IRIS数据库(明斯特)和柏林发射率数据库(BED)获得研究结果。
更新日期:2020-10-12
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