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The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites

Kaeter, David and Ziemann, Martin and Böttger, Ute and Weber, Iris and Hecht, Lutz and Voropaev, Sergey A. and Korochantsev, Alexander V. and Kocherov, Andrey V. (2017) The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites. Meteoritics & Planetary Science. Wiley. DOI: 10.1111/maps.13027 ISSN 1086-9379

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Abstract

We present results of petrographic, mineralogical, and chemical investigations of three Chelyabinsk meteorite fragments. Three distinct lithologies were identified: light S3 LL5, dark S4–S5 LL5 material, and opaque fine-grained former impact melt. Olivine–spinel thermometry revealed an equilibration temperature of 703 ± 23 °C for the light lithology. All plagioclase seems to be secondary, showing neither shock-induced fractures nor sulfide-metal veinlets. Feldspathic glass can be observed showing features of extensive melting and, in the dark lithology, as maskelynite, lacking melt features and retaining grain boundaries of former plagioclase. Olivine of the dark lithology shows planar deformation features. Impact melt is dominated by Mg-rich olivine and resembles whole-rock melt. Melt veins (<2 mm) are connected to narrower veinlets. Melt vein textures are similar to pegmatite textures showing chilled margins, a zone of inward-grown elongated crystals and central vugs, suggesting crystallization from supercooled melt. Sulfide-metal droplets indicate liquid immiscibility of both silicate and sulfide as well as sulfide and metal melts. Impact melting may have been an important factor for differentiation of primitive planetary bodies. Graphite associated with micrometer-sized melt inclusions in primary olivine was detected by Raman mapping. Carbon isotopic studies of graphite could be applied to test a possible presolar origin.

Item URL in elib:https://elib.dlr.de/119065/
Document Type:Article
Title:The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kaeter, DavidiCRAG, School of Earth Sciences, University College Dublin, Dublin D04 N2E5, IrelandUNSPECIFIED
Ziemann, MartinInstitute for Earth and Environmental Sciences, University of Potsdam, Potsdam, GermanyUNSPECIFIED
Böttger, UteInstitut für Optische SensorsystemeUNSPECIFIED
Weber, IrisWestfälische Wilhelms-Universität MünsterUNSPECIFIED
Hecht, LutzMuseum für Naturkunde, Berlin, GermanyUNSPECIFIED
Voropaev, Sergey A.Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, RussiaUNSPECIFIED
Korochantsev, Alexander V.Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, RussiaUNSPECIFIED
Kocherov, Andrey V.Chelyabinsk State University, Chelyabinsk, RussiaUNSPECIFIED
Date:December 2017
Journal or Publication Title:Meteoritics & Planetary Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1111/maps.13027
Publisher:Wiley
ISSN:1086-9379
Status:Published
Keywords:Chelyabinsk Meteorite;
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Explorationsstudien
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Böttger, Dr.rer.nat. Ute
Deposited On:23 Feb 2018 10:22
Last Modified:06 Sep 2019 15:16

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