scholarly journals Aqueous alteration and bioalteration of a synthetic enstatite chondrite

2021 ◽  
Author(s):  
Caroline AVRIL ◽  
Valérie MALAVERGNE ◽  
Eric D. VAN HULLEBUSCH ◽  
Fabrice BRUNET ◽  
Stephan BORENSZTAJN ◽  
...  
Keyword(s):  
Aqueous Alteration ◽  
Enstatite Chondrite

scholarly journals The old, unique C1 chondrite Flensburg – Insight into the first processes of aqueous alteration, brecciation, and the diversity of water-bearing parent bodies and lithologies

2021 ◽  
Vol 293 ◽  
pp. 142-186
Author(s):  
Addi Bischoff ◽  
Conel M. O'D. Alexander ◽  
Jean-Alix Barrat ◽  
Christoph Burkhardt ◽  
Henner Busemann ◽  
...  
Keyword(s):  
Aqueous Alteration ◽  
Insight Into

The aqueous alteration of GEMS-like amorphous silicate in a chondritic micrometeorite by Antarctic water

2021 ◽  
Vol 293 ◽  
pp. 399-421
Author(s):  
M.D. Suttle ◽  
L. Folco ◽  
M.J. Genge ◽  
I.A. Franchi ◽  
F. Campanale ◽  
...  
Keyword(s):  
Antarctic Water ◽  
Aqueous Alteration ◽  
Amorphous Silicate

Characterization of NH4-montmorillonite coexisting with NH4Cl salt at different aggregation states. Application to Ceres.

2021 ◽  
Author(s):  
Victoria Munoz-Iglesias ◽  
Maite Fernández-Sampedro ◽  
Carolina Gil-Lozano ◽  
Laura J. Bonales ◽  
Oscar Ercilla Herrero ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Spectroscopic Data ◽  
External Surface ◽  
Deionized Water ◽  
Asteroid Belt ◽  
Aqueous Alteration ◽  
Dawn Mission ◽  
Main Asteroid Belt ◽  
Spectroscopic Signatures

<p>Ceres, dwarf planet of the main asteroid belt, is considered a relic ocean world since the Dawn mission discovered evidences of aqueous alteration and cryovolcanic activity [1]. Unexpectedly, a variety of ammonium-rich minerals were identified on its surface, including phyllosilicates, carbonates, and chlorides [2]. Although from the Dawn’s VIR spectroscopic data it was not possible to specify the exact type of phyllosilicates observed, montmorillonite is considered a good candidate owing to its ability to incorporate NH<sub>4</sub><sup>+</sup> in its interlayers [3]. Ammonium-rich phases are usually found at greater distances from the Sun. Hence, the study on their stability at environmental conditions relevant to Ceres’ interior and of its regolith can help elucidate certain ambiguities concerning the provenance of its precursor materials.</p> <p>In this study, it was investigated the changes in the spectroscopic signatures of the clay mineral montmorillonite after (a) being immersed in ammonium chloride aqueous solution and, subsequently, (b) washed with deionized water. After each treatment, samples were submitted to different environmental conditions relevant to the surface of Ceres. For one experiment, they were frozen overnight at 193 K, and then subjected to 10<sup>-5</sup> bar for up to 4 days in a Telstar Cryodos lyophilizer. For the other, they were placed inside the Planetary Atmospheres and Surfaces Chamber (PASC) [4] for 1 day at 100 K and 5.10<sup>-8</sup> bar. The combination of different techniques, i.e., Raman and IR spectroscopies, XRD, and SEM/EDX, assisted the assignment of the bands to each particular molecule. In this regard, the signatures of the mineral external surface were distinguished from the interlayered NH<sub>4</sub><sup>+ </sup>cations. The degree of compaction of the samples resulted crucial on their stability and spectroscopic response, being stiff smectites more resistant to low temperatures and vacuum conditions. In ground clay minerals, a decrease in the basal space with a redshift of the interlayered NH<sub>4</sub><sup>+</sup> IR band was measured after just 1 day of being exposed to vacuum conditions.</p> <p>Acknowledgments</p> <p>This work was supported by the Spanish MINECO projects ESP2017-89053-C2-1-P and PID2019-107442RB-C32, and the AEI project MDM‐2017‐0737 Unidad de Excelencia “María de Maeztu”.</p> <p>References</p> <p>[1] De Sanctis et al.,  Space Sci. Rev. 216, 60, 2020</p> <p>[2] Raponi et al., Icarus 320, 83,  2019</p> <p>[3] Borden and Giese, Clays Clay Miner. 49, 444, 2001</p> <p>[4] Mateo-Marti et al., Life 9, 72, 2019</p>

The Kaidun meteorite: Composition and origin of inclusions in the metal of an enstatite chondrite clast

1996 ◽  
Vol 31 (5) ◽  
pp. 621-626 ◽  
Author(s):  
Andrei V. IVANOV ◽  
Glenn J. MACPHERSON ◽  
Michael E. ZOLENSKY ◽  
Nataliya N. KONONKOVA ◽  
Lyudmila F. MIGDISOVA
Keyword(s):  
Enstatite Chondrite

scholarly journals Intense aqueous alteration on C-type asteroids: Perspectives from giant fine-grained micrometeorites

2019 ◽  
Vol 245 ◽  
pp. 352-373 ◽  
Author(s):  
M.D. Suttle ◽  
L. Folco ◽  
M.J. Genge ◽  
S.S. Russell ◽  
J. Najorka ◽  
...  
Keyword(s):  
Aqueous Alteration ◽  
Fine Grained
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