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Volume 11
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10.3390/min11080845
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Article

NIR-MID Reflectance and Emissivity Study at Different Temperatures of Sodium Carbonate Minerals: Spectra Characterization and Implication for Remote Sensing Identification

by
Maximiliano Fastelli
1,*,
Azzurra Zucchini
1,
Paola Comodi
1,
Alessandro Maturilli
2,
Giulia Alemanno
2,
Ernesto Palomba
3 and
Riccardo Piergallini
4
1
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, 06123 Perugia, Italy
2
Institute of Planetary Research, DLR, German Aerospace Centre, D-12489 Berlin, Germany
3
Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), 00136 Rome, Italy
4
School of Science and Technology, University of Camerino, 62032 Camerino, Italy
*
Author to whom correspondence should be addressed.
Minerals 2021, 11(8), 845; https://doi.org/10.3390/min11080845
Submission received: 26 May 2021 / Revised: 28 July 2021 / Accepted: 31 July 2021 / Published: 5 August 2021
(This article belongs to the Section Crystallography and Physical Chemistry of Minerals & Nanominerals)
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Abstract

Recent satellite observations and the deconvolution of remote sensing data have shown the existence of various carbonate minerals in different solar system bodies. Emissivity, from 403 to 803 K, and reflectance spectra at 300 and 193 K of selected carbonates minerals with different ratios of Na:Ca and water amounts were respectively collected at 3–20 μm and at 1–16 μm. All reflectance spectra show absorption features in the 1.9–2.5 and 3.4–4.0 μm areas due to overtone and a combination of CO32− and fundamental vibrational models at ≈9.09, 11.35, 7.06, and 14.7 μm. The increase of the Na:Ca ratio in anhydrous samples produces a shift of the absorption features in the 3.4–4.0 μm area toward shorter wavelengths, and the peak at 3.9 μm doubles in the presence of a CO32− oxygen group shared with two cations in minerals having more complex structures. The comparison of the bands at ≈669 and ≈794 cm−1 in the emissivity spectra collected at high temperatures indicates that around 600 K, phase transitions occurred in natrite and thermonatrite. The reflectance spectra measured at 193 K reveal a fine structure compared to spectra collected at room temperature. The comparison of laboratory results with the spectrum of Ceres’s brightest crater Occator from the Dawn mission, taken as a case study, showed how the anhydrous samples, shortite and nyerereite, studied in this work can also be hypothesized for Ceres’s surface beyond that already suggested (trona, natrite, thermonatrite).
Keywords: emissivity; reflectance; carbonates; mineralogy; icy bodies emissivity; reflectance; carbonates; mineralogy; icy bodies

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MDPI and ACS Style

Fastelli, M.; Zucchini, A.; Comodi, P.; Maturilli, A.; Alemanno, G.; Palomba, E.; Piergallini, R. NIR-MID Reflectance and Emissivity Study at Different Temperatures of Sodium Carbonate Minerals: Spectra Characterization and Implication for Remote Sensing Identification. Minerals 2021, 11, 845. https://doi.org/10.3390/min11080845

AMA Style

Fastelli M, Zucchini A, Comodi P, Maturilli A, Alemanno G, Palomba E, Piergallini R. NIR-MID Reflectance and Emissivity Study at Different Temperatures of Sodium Carbonate Minerals: Spectra Characterization and Implication for Remote Sensing Identification. Minerals. 2021; 11(8):845. https://doi.org/10.3390/min11080845

Chicago/Turabian Style

Fastelli, Maximiliano, Azzurra Zucchini, Paola Comodi, Alessandro Maturilli, Giulia Alemanno, Ernesto Palomba, and Riccardo Piergallini. 2021. "NIR-MID Reflectance and Emissivity Study at Different Temperatures of Sodium Carbonate Minerals: Spectra Characterization and Implication for Remote Sensing Identification" Minerals 11, no. 8: 845. https://doi.org/10.3390/min11080845

APA Style

Fastelli, M., Zucchini, A., Comodi, P., Maturilli, A., Alemanno, G., Palomba, E., & Piergallini, R. (2021). NIR-MID Reflectance and Emissivity Study at Different Temperatures of Sodium Carbonate Minerals: Spectra Characterization and Implication for Remote Sensing Identification. Minerals, 11(8), 845. https://doi.org/10.3390/min11080845

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