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A shock recovery experiment and its implications for Mercury's surface: The effect of high pressure on porous olivine powder as a regolith analog

Stojic, Aleksandra N. and Morlok, A. and Tollan, Peter and Kohout, Tomas and Hermann, Jörg and Weber, Iris and Moreau, Juulia-Gabrielle and Hiesinger, Harald and Sohn, M. and Bauch, Karin E. and Reitze, Maximilian P. and Helbert, Jörn (2021) A shock recovery experiment and its implications for Mercury's surface: The effect of high pressure on porous olivine powder as a regolith analog. Icarus, 357, p. 114162. Elsevier. doi: 10.1016/j.icarus.2020.114162. ISSN 0019-1035.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0019103520305017

Abstract

We conducted classic dynamic high - pressure experiments on porous San Carlos (SC) olivine powder to examine if and how different shock stages modify corresponding reflectance mid – infrared (MIR) spectra. Microscopic investigation of the thin sections produced of our shocked samples indicates local peak pressures of >60 GPa along with all lower grade shock stages. Spectral analyses of optically identified shock areas were documented and compared in terms of Christiansen Feature (CF) and the position of olivine – diagnostic Reststrahlenbands (RBs). We found that one RB (fundamental vibrations of the orthosilicate - ion) of olivine occurring at 980 cm−1 (corresponding to ≈ 10.2 μm) shows the least energetic shift in the investigated MIR spectra and could therefore serve as a proxy for the presence of olivine in remote sensing application. Furthermore, a peak located at ≈ 1060 cm−1 (≈ 9.4 μm) shows a significant intensity change probably related to the degree of shock exposure or grain orientation effects, as we observe a decline in intensity of this band from our averaged reference olivine spectra of our IRIS database (diffuse reflectance measurement) down to spectra of grains showing mosaicism and recrystallized areas. We also report the presence of a weak band in some of the olivine spectra located at ≈ 1100 cm−1 (9.1 μm) that has an influence on the position of the CF when spectral data of olivine are averaged.

Item URL in elib:https://elib.dlr.de/142561/
Document Type:Article
Title:A shock recovery experiment and its implications for Mercury's surface: The effect of high pressure on porous olivine powder as a regolith analog
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Stojic, Aleksandra N.Westfälische Wilhelms-Universität MünsterUNSPECIFIED
Morlok, A.Westfälische Wilhelms-Universität MünsterUNSPECIFIED
Tollan, Peternstitut für Geologie, Baltzerstrasse 1+3, 3012 Bern, SwitzerlandUNSPECIFIED
Kohout, TomasDepartment of Geosciences and Geography, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland; Ursa Finnish Fireball Network, Kopernikuksentie 1, FI-00130 Helsinki, FinlandUNSPECIFIED
Hermann, JörgInstitut für Geologie, Baltzerstrasse 1+3, 3012 Bern, SwitzerlandUNSPECIFIED
Weber, IrisWestfälische Wilhelms-Universität MünsterUNSPECIFIED
Moreau, Juulia-GabrielleDepartment of Geosciences and Geography, University of Helsinki, Finland; Institute of Ecology and Earth Sciences, Department of Geology, University of Tartu, EstoniaUNSPECIFIED
Hiesinger, HaraldWilhelm Westfalisch University, Munster, Germany.UNSPECIFIED
Sohn, M.Hochschule Emden/Leer, Constantiaplatz 4, 26723 Emden , GermanyUNSPECIFIED
Bauch, Karin E.Westfälische Wilhelms-Universität MünsterUNSPECIFIED
Reitze, Maximilian P.Westfälische Wilhelms-Universität MünsterUNSPECIFIED
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Date:2021
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:357
DOI :10.1016/j.icarus.2020.114162
Page Range:p. 114162
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:FTIR, Shock recovery, Olivine, Space weathering, Regolith formation, MERTIS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project BepiColombo - MERTIS and BELA
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Laboratories
Deposited By: Helbert, Dr.rer.nat. Jörn
Deposited On:03 Jun 2021 07:06
Last Modified:03 Jun 2021 07:06

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