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Experimental constraints on the ordinary chondrite shock darkening caused by asteroid collisions

Kohouth, Tomas and Petrova, E.V. and Yakovlev, G.A. and Grokhovsky, V.I. and Penttilä, A. and Maturilli, Alessandro and Moreau, J.-G. and Berzin, S.V. and Wasiljeff, J. and Danilenko, I.A. and Zamyatin, D.A. and Muftakhetdinova, R.F. and Heikkilä, M. (2020) Experimental constraints on the ordinary chondrite shock darkening caused by asteroid collisions. Astronomy & Astrophysics, 639, A146. EDP Sciences. doi: 10.1051/0004-6361/202037593. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/abs/2020/07/aa37593-20/aa37593-20.html

Abstract

Context. Shock-induced changes in ordinary chondrite meteorites related to impacts or planetary collisions are known to be capable of altering their optical properties. Thus, one can hypothesize that a significant portion of the ordinary chondrite material may be hidden within the observed dark C/X asteroid population. Aims: The exact pressure-temperature conditions of the shock-induced darkening are not well constrained. Thus, we experimentally investigate the gradual changes in the chondrite material optical properties as a function of the shock pressure. Methods: A spherical shock experiment with Chelyabinsk LL5 was performed in order to study the changes in its optical properties. The spherical shock experiment geometry allows for a gradual increase of shock pressure from ~15 GPa at a rim toward hundreds of gigapascals in the center. Results: Four distinct zones were observed with an increasing shock load. The optical changes are minimal up to ~50 GPa. In the region of ~50-60 GPa, shock darkening occurs due to the troilite melt infusion into silicates. This process abruptly ceases at pressures of ~60 GPa due to an onset of silicate melting. At pressures higher than ~150 GPa, recrystallization occurs and is associated with a second-stage shock darkening due to fine troilite-metal eutectic grains. The shock darkening affects the ultraviolet, visible, and near-infrared region while changes to the MIR spectrum are minimal. Conclusions: Shock darkening is caused by two distinct mechanisms with characteristic pressure regions, which are separated by an interval where the darkening ceases. This implies a reduced amount of shock-darkened material produced during the asteroid collisions.

Item URL in elib:https://elib.dlr.de/138389/
Document Type:Article
Title:Experimental constraints on the ordinary chondrite shock darkening caused by asteroid collisions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kohouth, TomasDep. of Physics, University of Helsinki & The Czech Academy of ScienceUNSPECIFIED
Petrova, E.V.Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian FederationUNSPECIFIED
Yakovlev, G.A.Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian FederationUNSPECIFIED
Grokhovsky, V.I.Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian FederationUNSPECIFIED
Penttilä, A.Department of Physics, University of Helsinki, FinlandUNSPECIFIED
Maturilli, AlessandroAlessandro.Maturilli (at) dlr.dehttps://orcid.org/0000-0003-4613-9799
Moreau, J.-G.UNSPECIFIEDUNSPECIFIED
Berzin, S.V.Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian FederationUNSPECIFIED
Wasiljeff, J.Department of Geosciences and Geography, University of Helsinki, FinlandUNSPECIFIED
Danilenko, I.A.Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian Federation; Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian FederationUNSPECIFIED
Zamyatin, D.A.Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian Federation; Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian FederationUNSPECIFIED
Muftakhetdinova, R.F.Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian FederationUNSPECIFIED
Heikkilä, M.Department of Chemistry, University of Helsinki, FinlandUNSPECIFIED
Date:July 2020
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:639
DOI :10.1051/0004-6361/202037593
Page Range:A146
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:meteorites, meteors, meteoroids, minor planets, asteroids: general, shock waves, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
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, Project MASCOT Science and operation (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Laboratories
Deposited By: Maturilli, Dr. Alessandro
Deposited On:27 Nov 2020 10:53
Last Modified:27 Nov 2020 10:53

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