The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites
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...
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| Veröffentlicht in: | Meteoritics & planetary science 2018-03, Vol.53 (3), p.416-432 |
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| creator | Kaeter, David Ziemann, Martin A. Böttger, Ute Weber, Iris Hecht, Lutz Voropaev, Sergey A. Korochantsev, Alexander V. Kocherov, Andrey V. |
| description | 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 ( |
| doi_str_mv | 10.1111/maps.13027 |
| format | Article |
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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.</description><identifier>ISSN: 1086-9379</identifier><identifier>EISSN: 1945-5100</identifier><identifier>DOI: 10.1111/maps.13027</identifier><language>eng</language><publisher>Hoboken: Wiley Subscription Services, Inc</publisher><subject>Chondrites ; Crystallization ; Crystals ; Deformation ; Electron microscopy ; Elongation ; Grain boundaries ; Graphite ; Immiscibility ; Lithology ; Melting ; Melts ; Metals ; Meteorites ; Meteors & meteorites ; Miscibility ; Olivine ; Pegmatite ; Plagioclase ; Spectroscopy ; Sulfides ; Thermometry</subject><ispartof>Meteoritics & planetary science, 2018-03, Vol.53 (3), p.416-432</ispartof><rights>The Meteoritical Society, 2017.</rights><rights>Copyright © 2018 The Meteoritical Society</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3607-3a27c8fbb1cc637b2622eaafae6111edf6627d6e301fbc8485fda3ee895044323</citedby><cites>FETCH-LOGICAL-a3607-3a27c8fbb1cc637b2622eaafae6111edf6627d6e301fbc8485fda3ee895044323</cites><orcidid>0000-0002-2401-4074</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Fmaps.13027$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fmaps.13027$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1416,1432,27923,27924,45573,45574,46408,46832</link.rule.ids></links><search><creatorcontrib>Kaeter, David</creatorcontrib><creatorcontrib>Ziemann, Martin A.</creatorcontrib><creatorcontrib>Böttger, Ute</creatorcontrib><creatorcontrib>Weber, Iris</creatorcontrib><creatorcontrib>Hecht, Lutz</creatorcontrib><creatorcontrib>Voropaev, Sergey A.</creatorcontrib><creatorcontrib>Korochantsev, Alexander V.</creatorcontrib><creatorcontrib>Kocherov, Andrey V.</creatorcontrib><title>The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites</title><title>Meteoritics & planetary science</title><description>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.</description><subject>Chondrites</subject><subject>Crystallization</subject><subject>Crystals</subject><subject>Deformation</subject><subject>Electron microscopy</subject><subject>Elongation</subject><subject>Grain boundaries</subject><subject>Graphite</subject><subject>Immiscibility</subject><subject>Lithology</subject><subject>Melting</subject><subject>Melts</subject><subject>Metals</subject><subject>Meteorites</subject><subject>Meteors & meteorites</subject><subject>Miscibility</subject><subject>Olivine</subject><subject>Pegmatite</subject><subject>Plagioclase</subject><subject>Spectroscopy</subject><subject>Sulfides</subject><subject>Thermometry</subject><issn>1086-9379</issn><issn>1945-5100</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kctu2zAQRYkiAeo63eQLBuiugBJS1LM7w0ibAHkhj7VAUUOLrkQqpGxDv9SvDB11HW6GuHPIO-Ql5JzRCxbWZS8Gf8E4jfMvZMHKJI1SRulJ2NMii0qel1_JN--3lPKU8WRB_r20COsWu0nU2vi_0OOI1ukRf8E9HiBoetOOHpSzPQiQth8cthjkPQJ2KEdnDfRaOuulHSYQpoEn0QsDfvjozrIfd80EBz22gHvdoJEIyjrYODG0wS44ge30XhsEq8C6RhvhJpCtNc1xHn9GTpXoPH7_X5fk9ffVy_o6un34c7Ne3UaCZzSPuIhzWai6ZlJmPK_jLI5RCCUwCz-EjcqyOG8y5JSpWhZJkapGcMSiTGmS8JgvyY_53sHZtx36sdranTPBsoopLWlC08Atyc-ZOj7cO1TV4HQfJq4YrY5ZVMcsqo8sAsxm-KA7nD4hq7vV4_N85h357ZEy</recordid><startdate>201803</startdate><enddate>201803</enddate><creator>Kaeter, David</creator><creator>Ziemann, Martin A.</creator><creator>Böttger, Ute</creator><creator>Weber, Iris</creator><creator>Hecht, Lutz</creator><creator>Voropaev, Sergey A.</creator><creator>Korochantsev, Alexander V.</creator><creator>Kocherov, Andrey V.</creator><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-2401-4074</orcidid></search><sort><creationdate>201803</creationdate><title>The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites</title><author>Kaeter, David ; 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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.</abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc</pub><doi>10.1111/maps.13027</doi><tpages>17</tpages><orcidid>https://orcid.org/0000-0002-2401-4074</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Chondrites Crystallization Crystals Deformation Electron microscopy Elongation Grain boundaries Graphite Immiscibility Lithology Melting Melts Metals Meteorites Meteors & meteorites Miscibility Olivine Pegmatite Plagioclase Spectroscopy Sulfides Thermometry |
| title | The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites |
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