Lidia Pittarello, Steven Goderis, Bastien Soens, Seann J. McKibbin, Gabriele Giuli, Federico Bariselli, Bruno Dias, Bernd Helber, Giovanni Orazio Lepore, Frank Vanhaecke, Christian Köberl, Thierry E. Magin, Philippe Claeys
- Melting experiments attempting to reproduce some of the processes affecting asteroidal and cometary material during atmospheric entry have been performed in a high enthalpy facility. For the first time with the specific experimental setup, the resulting material has been recovered, studied, and compared with natural analogues, focusing on the thermal and redox reactions triggered by interaction between the melt and the atmospheric gases under high temperature and low pressure conditions. Experimental conditions were tested across a range of parameters, such as heat flux, experiment duration, and pressure, using two types of sample holders materials, namely cork and graphite. A basalt served as asteroidal analog and to calibrate the experiments, before melting a H5 ordinary chondrite meteorite. The quenched melt recovered after the experiments has been analyzed by mu-XRF, EDS-SEM, EMPA, LA-ICP-MS, and XANES spectroscopy. The glass formed from the basalt is fairly homogeneous, depleted in highly volatile elements (e.g., Na, K),Melting experiments attempting to reproduce some of the processes affecting asteroidal and cometary material during atmospheric entry have been performed in a high enthalpy facility. For the first time with the specific experimental setup, the resulting material has been recovered, studied, and compared with natural analogues, focusing on the thermal and redox reactions triggered by interaction between the melt and the atmospheric gases under high temperature and low pressure conditions. Experimental conditions were tested across a range of parameters, such as heat flux, experiment duration, and pressure, using two types of sample holders materials, namely cork and graphite. A basalt served as asteroidal analog and to calibrate the experiments, before melting a H5 ordinary chondrite meteorite. The quenched melt recovered after the experiments has been analyzed by mu-XRF, EDS-SEM, EMPA, LA-ICP-MS, and XANES spectroscopy. The glass formed from the basalt is fairly homogeneous, depleted in highly volatile elements (e.g., Na, K), relatively enriched in moderately siderophile elements (e.g., Co, Ni), and has reached an equilibrium redox state with a lower Fe3+/Fe-tot ratio than that in the starting material. Spherical objects, enriched in SiO2, Na2O and K2O, were observed, inferring condensation from the vaporized material. Despite instantaneous quenching, the melt formed from the ordinary chondrite shows extensive crystallization of mostly olivine and magnetite, the latter indicative of oxygen fugacity compatible with presence of both Fe2+ and Fe3+. Similar features have been observed in natural meteorite fusion crusts and in micrometeorites, implying that, at least in terms of maximum temperature reached and chemical reactions, the experiments have successfully reproduced the conditions likely encountered by extraterrestrial material following atmospheric entry.…
MetadatenAuthor details: | Lidia PittarelloORCiD, Steven GoderisORCiD, Bastien SoensORCiD, Seann J. McKibbinORCiD, Gabriele GiuliORCiD, Federico BariselliORCiD, Bruno DiasORCiD, Bernd HelberORCiD, Giovanni Orazio LeporeORCiD, Frank VanhaeckeORCiDGND, Christian KöberlGND, Thierry E. MaginORCiD, Philippe ClaeysORCiD |
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DOI: | https://doi.org/10.1016/j.icarus.2019.04.033 |
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ISSN: | 0019-1035 |
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ISSN: | 1090-2643 |
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Title of parent work (English): | Icarus : international journal of solar system studies |
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Publisher: | Elsevier |
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Place of publishing: | San Diego |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2019 |
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Publication year: | 2019 |
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Release date: | 2020/11/24 |
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Tag: | Atmospheric entry; Fusion crust; Melting experiments; Meteorites; Redox |
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Volume: | 331 |
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Number of pages: | 9 |
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First page: | 170 |
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Last Page: | 178 |
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Funding institution: | Belgian Science Policy Office (BELSPO), under the Belgian Research Action through Interdisciplinary Networks (BRAIN) funding [BR/143/A2/METRO]; Austrian Science Fund (FWF)Austrian Science Fund (FWF) [V-505 N 29]; Research Foundation - Flanders (FWO)FWO; Funds for Research Training in Industry and Agriculture (FRIA)Fonds de la Recherche Scientifique - FNRS; VUB Strategic Research Program; BELSPOBelgian Federal Science Policy Office; FWOFWO; BOF-UGent; Programma Nazionale delle Ricerche in Antartide ("Meteoriti Antartiche" project) [PNRA16_00029] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
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Peer review: | Referiert |
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