NIR reflectance spectroscopy of hydrated and anhydrous sodium carbonates for at different temperatures

被引：23

作者：

De Angelis, S. ^{[1
]}

Carli, C. ^{[1
]}

Tosi, F. ^{[1
]}

Beck, P. ^{[2
]}

Brissaud, O. ^{[2
]}

Schmitt, B. ^{[2
]}

Potin, S. ^{[2
]}

De Sanctis, M. C. ^{[1
]}

Capaccioni, F. ^{[1
]}

Piccioni, G. ^{[1
]}

机构：

[1] Ist Astrofis & Planetol Spaziali, Via Fosso del Cavaliere, I-00133 Rome, Italy

[2] Univ Grenoble Alpes, CNRS, IPAG, F-38058 Grenoble 9, France

来源：

ICARUS | 2019年 / 317卷

关键词：

INFRARED-SPECTRA; EUROPAS SURFACE; SALT MINERALS; MARS; IDENTIFICATION; GEOCHEMISTRY; DEPOSITS; CLIMATE; LI2CO3; PHASE;

D O I：

10.1016/j.icarus.2018.08.012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent space-based observations have revealed or suggested the existence of various types of carbonate salts in several Solar System bodies, such as Mars, Ceres, Enceladus, and Europa. Natrite is the main component of the crater Occator's faculae observed in detail by the Dawn spacecraft on the dwarf planet Ceres. Sodium carbonates are thought to form as precipitates in brines, originating in aqueous environments in the subsurface of Ceres and icy bodies. Here we report about near-infrared (0.8-4.2 mu m) reflectance spectroscopic investigations on three compounds, namely natrite (anhydrous Na2CO3), monohydrated sodium carbonate (Na2CO3 center dot H2O, thermonatrite) and decahydrate sodium carbonate (Na2CO3 center dot 10H(2)O, natron). Spectral measurements have been carried out in the overall temperature range 93-279 K, representative of planetary surfaces. The analysis of diagnostic spectral signatures shows different temperature-dependent trends for several band parameters, as well as different behavior as a function of the grain size for a given temperature. While spectra of natrite are characterized by several CO3 absorptions, broad and strong absorption features due to H2O dominate the spectra of heavily hydrated natron. The intermediate sample (monohydrated) shows multiple bands due to the overlap of CO3 and H2O vibrational modes. Our temperature-dependent laboratory spectra are compared with Dawn-VIR spectra of Ceres and with Galileo-NIMS spectra of Europa.

引用

页码：388 / 411

页数：24

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