Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins
Peace River is one of the few shocked members of the L-chondrites clan that contains both high-pressure polymorphs of olivine, ringwoodite and wadsleyite, in diverse textures and settings in fragments entrained in shock-melt veins. Among these settings are complete olivine porphyritic chondrules. We...
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creator | Miyahara, Masaaki El Goresy, Ahmed Ohtani, Eiji Nagase, Toshiro Nishijima, Masahiko Vashaei, Zahra Ferroir, Tristan Gillet, Philippe Dubrovinsky, Leonid Simionovici, Alexandre |
description | Peace River is one of the few shocked members of the L-chondrites clan that contains both high-pressure polymorphs of olivine, ringwoodite and wadsleyite, in diverse textures and settings in fragments entrained in shock-melt veins. Among these settings are complete olivine porphyritic chondrules. We encountered few squeezed and flattened olivine porphyritic chondrules entrained in shock-melt veins of this meteorite with novel textures and composition. The former chemically unzoned (Fa₂₄₋₂₆) olivine porphyritic crystals are heavily flattened and display a concentric intergrowth with Mg-rich wadsleyite of a very narrow compositional range (Fa₆-Fa₁₀) in the core. Wadsleyite core is surrounded by a Mg-poor and chemically stark zoned ringwoodite (Fa₂₈-Fa₃₈) belt. The wadsleyite-ringwoodite interface denotes a compositional gap of up to 32 mol % fayalite. A transmission electron microscopy study of focused ion beam slices in both regions indicates that the wadsleyite core and ringwoodite belt consist of granoblastic-like intergrowth of polygonal crystallites of both ringwoodite and wadsleyite, with wadsleyite crystallites dominating in the core and ringwoodite crystallites dominating in the belt. Texture and compositions of both high-pressure polymorphs are strongly suggestive of formation by a fractional crystallization of the olivine melt of a narrow composition (Fa₂₄₋₂₆), starting with Mg-rich wadsleyite followed by the Mg-poor ringwoodite from a shock-induced melt of olivine composition (Fa₂₄₋₂₆). Our findings could erase the possibility of the resulting unrealistic time scales of the high-pressure regime reported recently from other shocked L-6 chondrites. |
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Among these settings are complete olivine porphyritic chondrules. We encountered few squeezed and flattened olivine porphyritic chondrules entrained in shock-melt veins of this meteorite with novel textures and composition. The former chemically unzoned (Fa₂₄₋₂₆) olivine porphyritic crystals are heavily flattened and display a concentric intergrowth with Mg-rich wadsleyite of a very narrow compositional range (Fa₆-Fa₁₀) in the core. Wadsleyite core is surrounded by a Mg-poor and chemically stark zoned ringwoodite (Fa₂₈-Fa₃₈) belt. The wadsleyite-ringwoodite interface denotes a compositional gap of up to 32 mol % fayalite. A transmission electron microscopy study of focused ion beam slices in both regions indicates that the wadsleyite core and ringwoodite belt consist of granoblastic-like intergrowth of polygonal crystallites of both ringwoodite and wadsleyite, with wadsleyite crystallites dominating in the core and ringwoodite crystallites dominating in the belt. Texture and compositions of both high-pressure polymorphs are strongly suggestive of formation by a fractional crystallization of the olivine melt of a narrow composition (Fa₂₄₋₂₆), starting with Mg-rich wadsleyite followed by the Mg-poor ringwoodite from a shock-induced melt of olivine composition (Fa₂₄₋₂₆). Our findings could erase the possibility of the resulting unrealistic time scales of the high-pressure regime reported recently from other shocked L-6 chondrites.</description><identifier>ISSN: 0027-8424</identifier><identifier>EISSN: 1091-6490</identifier><identifier>DOI: 10.1073/pnas.0801518105</identifier><identifier>PMID: 18562280</identifier><language>eng</language><publisher>United States: National Academy of Sciences</publisher><subject>Chemical composition ; Chondrites ; Chondrules ; Crystallites ; Crystallization ; Crystals ; Earth ; Earth Sciences ; Ions ; Melting ; Minerals ; Olivine ; Physical Sciences ; Polymorphism ; Pyroxenes ; Sciences of the Universe ; Transmission electron microscopy</subject><ispartof>Proceedings of the National Academy of Sciences - PNAS, 2008-06, Vol.105 (25), p.8542-8547</ispartof><rights>Copyright 2008 The National Academy of Sciences of the United States of America</rights><rights>Copyright National Academy of Sciences Jun 24, 2008</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><rights>2008 by The National Academy of Sciences of the USA</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a644t-8374bea1205e285c05586dc93a312eb4b4034234724c46394dd86a753648813d3</citedby><cites>FETCH-LOGICAL-a644t-8374bea1205e285c05586dc93a312eb4b4034234724c46394dd86a753648813d3</cites><orcidid>0000-0001-5349-6482 ; 0000-0002-0855-0491</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttp://www.pnas.org/content/105/25.cover.gif</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/25462822$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/25462822$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>230,315,729,782,786,805,887,27931,27932,53798,53800,58024,58257</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/18562280$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://hal.science/hal-00338904$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Miyahara, Masaaki</creatorcontrib><creatorcontrib>El Goresy, Ahmed</creatorcontrib><creatorcontrib>Ohtani, Eiji</creatorcontrib><creatorcontrib>Nagase, Toshiro</creatorcontrib><creatorcontrib>Nishijima, Masahiko</creatorcontrib><creatorcontrib>Vashaei, Zahra</creatorcontrib><creatorcontrib>Ferroir, Tristan</creatorcontrib><creatorcontrib>Gillet, Philippe</creatorcontrib><creatorcontrib>Dubrovinsky, Leonid</creatorcontrib><creatorcontrib>Simionovici, Alexandre</creatorcontrib><title>Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins</title><title>Proceedings of the National Academy of Sciences - PNAS</title><addtitle>Proc Natl Acad Sci U S A</addtitle><description>Peace River is one of the few shocked members of the L-chondrites clan that contains both high-pressure polymorphs of olivine, ringwoodite and wadsleyite, in diverse textures and settings in fragments entrained in shock-melt veins. Among these settings are complete olivine porphyritic chondrules. We encountered few squeezed and flattened olivine porphyritic chondrules entrained in shock-melt veins of this meteorite with novel textures and composition. The former chemically unzoned (Fa₂₄₋₂₆) olivine porphyritic crystals are heavily flattened and display a concentric intergrowth with Mg-rich wadsleyite of a very narrow compositional range (Fa₆-Fa₁₀) in the core. Wadsleyite core is surrounded by a Mg-poor and chemically stark zoned ringwoodite (Fa₂₈-Fa₃₈) belt. The wadsleyite-ringwoodite interface denotes a compositional gap of up to 32 mol % fayalite. A transmission electron microscopy study of focused ion beam slices in both regions indicates that the wadsleyite core and ringwoodite belt consist of granoblastic-like intergrowth of polygonal crystallites of both ringwoodite and wadsleyite, with wadsleyite crystallites dominating in the core and ringwoodite crystallites dominating in the belt. Texture and compositions of both high-pressure polymorphs are strongly suggestive of formation by a fractional crystallization of the olivine melt of a narrow composition (Fa₂₄₋₂₆), starting with Mg-rich wadsleyite followed by the Mg-poor ringwoodite from a shock-induced melt of olivine composition (Fa₂₄₋₂₆). Our findings could erase the possibility of the resulting unrealistic time scales of the high-pressure regime reported recently from other shocked L-6 chondrites.</description><subject>Chemical composition</subject><subject>Chondrites</subject><subject>Chondrules</subject><subject>Crystallites</subject><subject>Crystallization</subject><subject>Crystals</subject><subject>Earth</subject><subject>Earth Sciences</subject><subject>Ions</subject><subject>Melting</subject><subject>Minerals</subject><subject>Olivine</subject><subject>Physical Sciences</subject><subject>Polymorphism</subject><subject>Pyroxenes</subject><subject>Sciences of the Universe</subject><subject>Transmission electron microscopy</subject><issn>0027-8424</issn><issn>1091-6490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNp9ks1vEzEQxVcIREPhzAmwOCA4bDv-XO8FqaoKRYrEAXq2nF1v4uDYwd7dEs784XhJ1EAPnCzP_OY9j_yK4jmGMwwVPd96nc5AAuZYYuAPihmGGpeC1fCwmAGQqpSMsJPiSUprAKi5hMfFCZZcECJhVvy6Gm1rfGNQFyLqom56G7x2qIm71Gvn7E89VVDo0K1ukzM72xukfYui9cvbENrp3sWwQcHZ0XqDNsb1CVmPmlXwbRycScj4PurcbKd6WoXmWzlhaDTWp6fFo067ZJ4dztPi5sPV18vrcv7546fLi3mpBWN9KWnFFkZjAtwQyRvgXIq2qammmJgFWzCgjFBWEdYwQWvWtlLoilPBpMS0pafF-73udlhsTNv8eZRT22g3Ou5U0Fb92_F2pZZhVITRbE6zwLu9wOre2PXFXE01AEplDWzEmX1zMIvh-2BSrzY2NcY57U0YkhI14UQAz-Dre-A6DDH_QVIEMK0xrkiGzvdQE0NK0XR39hjUFAU1RUEdo5AnXv697JE__H0GXh2AafIoxxXhSnI2mb79P6G6wbne_Ogz-mKPrlMf4h1LOBNEEnI063RQehltUjdfpvVyJqEWlaC_AcXF280</recordid><startdate>20080624</startdate><enddate>20080624</enddate><creator>Miyahara, Masaaki</creator><creator>El Goresy, Ahmed</creator><creator>Ohtani, Eiji</creator><creator>Nagase, Toshiro</creator><creator>Nishijima, Masahiko</creator><creator>Vashaei, Zahra</creator><creator>Ferroir, Tristan</creator><creator>Gillet, Philippe</creator><creator>Dubrovinsky, Leonid</creator><creator>Simionovici, Alexandre</creator><general>National Academy of Sciences</general><general>National Acad Sciences</general><scope>FBQ</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7QL</scope><scope>7QP</scope><scope>7QR</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TK</scope><scope>7TM</scope><scope>7TO</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7X8</scope><scope>1XC</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0001-5349-6482</orcidid><orcidid>https://orcid.org/0000-0002-0855-0491</orcidid></search><sort><creationdate>20080624</creationdate><title>Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins</title><author>Miyahara, Masaaki ; 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Among these settings are complete olivine porphyritic chondrules. We encountered few squeezed and flattened olivine porphyritic chondrules entrained in shock-melt veins of this meteorite with novel textures and composition. The former chemically unzoned (Fa₂₄₋₂₆) olivine porphyritic crystals are heavily flattened and display a concentric intergrowth with Mg-rich wadsleyite of a very narrow compositional range (Fa₆-Fa₁₀) in the core. Wadsleyite core is surrounded by a Mg-poor and chemically stark zoned ringwoodite (Fa₂₈-Fa₃₈) belt. The wadsleyite-ringwoodite interface denotes a compositional gap of up to 32 mol % fayalite. A transmission electron microscopy study of focused ion beam slices in both regions indicates that the wadsleyite core and ringwoodite belt consist of granoblastic-like intergrowth of polygonal crystallites of both ringwoodite and wadsleyite, with wadsleyite crystallites dominating in the core and ringwoodite crystallites dominating in the belt. Texture and compositions of both high-pressure polymorphs are strongly suggestive of formation by a fractional crystallization of the olivine melt of a narrow composition (Fa₂₄₋₂₆), starting with Mg-rich wadsleyite followed by the Mg-poor ringwoodite from a shock-induced melt of olivine composition (Fa₂₄₋₂₆). Our findings could erase the possibility of the resulting unrealistic time scales of the high-pressure regime reported recently from other shocked L-6 chondrites.</abstract><cop>United States</cop><pub>National Academy of Sciences</pub><pmid>18562280</pmid><doi>10.1073/pnas.0801518105</doi><tpages>6</tpages><orcidid>https://orcid.org/0000-0001-5349-6482</orcidid><orcidid>https://orcid.org/0000-0002-0855-0491</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Chemical composition Chondrites Chondrules Crystallites Crystallization Crystals Earth Earth Sciences Ions Melting Minerals Olivine Physical Sciences Polymorphism Pyroxenes Sciences of the Universe Transmission electron microscopy |
title | Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins |
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