A TEM study of exsolution in Ca‐rich pyroxenes from the Paris and Renazzo chondrites: Determination of type I chondrule cooling rates
We conducted a transmission electron microscope study of the exsolution microstructures of Ca‐rich pyroxenes in type I chondrules from the Paris CM and Renazzo CR carbonaceous chondrites in order to provide better constraints on the cooling history of type I chondrules. Our study shows a high variab...
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| Veröffentlicht in: | Meteoritics & planetary science 2018-03, Vol.53 (3), p.482-492 |
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| creator | Cuvillier, Priscille Chaumard, Noël Leroux, Hugues Zanda, Brigitte Hewins, Roger H. Jacob, Damien Devouard, Bertrand |
| description | We conducted a transmission electron microscope study of the exsolution microstructures of Ca‐rich pyroxenes in type I chondrules from the Paris CM and Renazzo CR carbonaceous chondrites in order to provide better constraints on the cooling history of type I chondrules. Our study shows a high variability of composition in the augite grains at a submicrometer scale, reflecting nonequilibrium crystallization. The microstructure is closely related to the local composition and is thus variable inside augite grains. For compositions inside the pyroxene miscibility gap, with a wollastonite (Wo) content typically below 40 mole%, the augite grains contain abundant exsolution lamellae on (001). For grain areas with composition close to Wo40, a modulated texture on (100) and (001) is the dominant microstructure, while areas with compositions higher than Wo40 do not show any exsolution microstructure development. To estimate the cooling rate, we used the spacing of the exsolution lamellae on (001), for which the growth is diffusion controlled and thus sensitive to the cooling rate. Despite the relatively homogeneous microstructures of augite grains with Wo |
| doi_str_mv | 10.1111/maps.13032 |
| format | Article |
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Our study shows a high variability of composition in the augite grains at a submicrometer scale, reflecting nonequilibrium crystallization. The microstructure is closely related to the local composition and is thus variable inside augite grains. For compositions inside the pyroxene miscibility gap, with a wollastonite (Wo) content typically below 40 mole%, the augite grains contain abundant exsolution lamellae on (001). For grain areas with composition close to Wo40, a modulated texture on (100) and (001) is the dominant microstructure, while areas with compositions higher than Wo40 do not show any exsolution microstructure development. To estimate the cooling rate, we used the spacing of the exsolution lamellae on (001), for which the growth is diffusion controlled and thus sensitive to the cooling rate. Despite the relatively homogeneous microstructures of augite grains with Wo < 35 mole%, our study of four chondrules suggests a range of cooling rates from ~10 to ~1000 °C h−1, within the temperature interval 1200–1350 °C. These cooling rates are comparable to those of type II chondrules, i.e., 1–1000 °C h−1. We conclude that the formation of type I and II chondrules in the proto‐solar nebula was the result of a common mechanism.</description><identifier>ISSN: 1086-9379</identifier><identifier>EISSN: 1945-5100</identifier><identifier>DOI: 10.1111/maps.13032</identifier><language>eng</language><publisher>Hoboken: Wiley Subscription Services, Inc</publisher><subject>Carbonaceous chondrites ; Chondrites ; Chondrule ; Cooling ; Cooling rate ; Crystallization ; Diffusion rate ; Earth Sciences ; Grains ; Microstructure ; Miscibility ; Miscibility gap ; Nebulae ; Pyroxenes ; Sciences of the Universe ; Solar nebula ; Temperature ; Wollastonite</subject><ispartof>Meteoritics & planetary science, 2018-03, Vol.53 (3), p.482-492</ispartof><rights>The Meteoritical Society, 2017.</rights><rights>Copyright © 2018 The Meteoritical Society</rights><rights>Attribution</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3942-47e7bc059256bf284285f49519c9dc32b4d6de2a16f649be9d43cf6c88e91cc23</citedby><cites>FETCH-LOGICAL-a3942-47e7bc059256bf284285f49519c9dc32b4d6de2a16f649be9d43cf6c88e91cc23</cites><orcidid>0000-0002-8806-8434 ; 0000-0002-8774-1842 ; 0000-0002-4210-7151</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.13032$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fmaps.13032$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,314,776,780,881,1411,1427,27901,27902,45550,45551,46384,46808</link.rule.ids><backlink>$$Uhttps://hal.science/hal-01765559$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Cuvillier, Priscille</creatorcontrib><creatorcontrib>Chaumard, Noël</creatorcontrib><creatorcontrib>Leroux, Hugues</creatorcontrib><creatorcontrib>Zanda, Brigitte</creatorcontrib><creatorcontrib>Hewins, Roger H.</creatorcontrib><creatorcontrib>Jacob, Damien</creatorcontrib><creatorcontrib>Devouard, Bertrand</creatorcontrib><title>A TEM study of exsolution in Ca‐rich pyroxenes from the Paris and Renazzo chondrites: Determination of type I chondrule cooling rates</title><title>Meteoritics & planetary science</title><description>We conducted a transmission electron microscope study of the exsolution microstructures of Ca‐rich pyroxenes in type I chondrules from the Paris CM and Renazzo CR carbonaceous chondrites in order to provide better constraints on the cooling history of type I chondrules. Our study shows a high variability of composition in the augite grains at a submicrometer scale, reflecting nonequilibrium crystallization. The microstructure is closely related to the local composition and is thus variable inside augite grains. For compositions inside the pyroxene miscibility gap, with a wollastonite (Wo) content typically below 40 mole%, the augite grains contain abundant exsolution lamellae on (001). For grain areas with composition close to Wo40, a modulated texture on (100) and (001) is the dominant microstructure, while areas with compositions higher than Wo40 do not show any exsolution microstructure development. To estimate the cooling rate, we used the spacing of the exsolution lamellae on (001), for which the growth is diffusion controlled and thus sensitive to the cooling rate. Despite the relatively homogeneous microstructures of augite grains with Wo < 35 mole%, our study of four chondrules suggests a range of cooling rates from ~10 to ~1000 °C h−1, within the temperature interval 1200–1350 °C. These cooling rates are comparable to those of type II chondrules, i.e., 1–1000 °C h−1. We conclude that the formation of type I and II chondrules in the proto‐solar nebula was the result of a common mechanism.</description><subject>Carbonaceous chondrites</subject><subject>Chondrites</subject><subject>Chondrule</subject><subject>Cooling</subject><subject>Cooling rate</subject><subject>Crystallization</subject><subject>Diffusion rate</subject><subject>Earth Sciences</subject><subject>Grains</subject><subject>Microstructure</subject><subject>Miscibility</subject><subject>Miscibility gap</subject><subject>Nebulae</subject><subject>Pyroxenes</subject><subject>Sciences of the Universe</subject><subject>Solar nebula</subject><subject>Temperature</subject><subject>Wollastonite</subject><issn>1086-9379</issn><issn>1945-5100</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kc9O3DAQhyNUJCj00icYiVMrhfpvNu5ttdCCtKiI0rPldSasUdZO7QQIp9565Rl5kmYJ6pG5zGj0zaeRfln2kZJjOtaXjWnTMeWEs51snyohc0kJeTfOpCxyxWdqL3uf0i0hXFIu9rO_c7g-vYDU9dUAoQZ8SKHpOxc8OA8L8_znKTq7hnaI4QE9Jqhj2EC3Rrg00SUwvoIr9ObxMYBdB19F12H6CifYYdw4b15co7kbWoTzV6ZvEGwIjfM3EM14cJjt1qZJ-OG1H2S_vp1eL87y5Y_v54v5MjdcCZaLGc5WlkjFZLGqWSlYKWuhJFVWVZazlaiKCpmhRV0ItUJVCW7rwpYlKmot4wfZp8m7No1uo9uYOOhgnD6bL_V2R-iskFKqOzqyRxPbxvC7x9Tp29BHP76nGSGKCEKJGKnPE2VjSCli_V9Lid6Goreh6JdQRphO8L1rcHiD1Bfzy5_TzT-EA5BL</recordid><startdate>201803</startdate><enddate>201803</enddate><creator>Cuvillier, Priscille</creator><creator>Chaumard, Noël</creator><creator>Leroux, Hugues</creator><creator>Zanda, Brigitte</creator><creator>Hewins, Roger H.</creator><creator>Jacob, Damien</creator><creator>Devouard, Bertrand</creator><general>Wiley Subscription Services, Inc</general><general>Wiley</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-8806-8434</orcidid><orcidid>https://orcid.org/0000-0002-8774-1842</orcidid><orcidid>https://orcid.org/0000-0002-4210-7151</orcidid></search><sort><creationdate>201803</creationdate><title>A TEM study of exsolution in Ca‐rich pyroxenes from the Paris and Renazzo chondrites: Determination of type I chondrule cooling rates</title><author>Cuvillier, Priscille ; Chaumard, Noël ; Leroux, Hugues ; Zanda, Brigitte ; Hewins, Roger H. ; Jacob, Damien ; Devouard, Bertrand</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3942-47e7bc059256bf284285f49519c9dc32b4d6de2a16f649be9d43cf6c88e91cc23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Carbonaceous chondrites</topic><topic>Chondrites</topic><topic>Chondrule</topic><topic>Cooling</topic><topic>Cooling rate</topic><topic>Crystallization</topic><topic>Diffusion rate</topic><topic>Earth Sciences</topic><topic>Grains</topic><topic>Microstructure</topic><topic>Miscibility</topic><topic>Miscibility gap</topic><topic>Nebulae</topic><topic>Pyroxenes</topic><topic>Sciences of the Universe</topic><topic>Solar nebula</topic><topic>Temperature</topic><topic>Wollastonite</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Cuvillier, Priscille</creatorcontrib><creatorcontrib>Chaumard, Noël</creatorcontrib><creatorcontrib>Leroux, Hugues</creatorcontrib><creatorcontrib>Zanda, Brigitte</creatorcontrib><creatorcontrib>Hewins, Roger H.</creatorcontrib><creatorcontrib>Jacob, Damien</creatorcontrib><creatorcontrib>Devouard, Bertrand</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Meteoritics & planetary science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cuvillier, Priscille</au><au>Chaumard, Noël</au><au>Leroux, Hugues</au><au>Zanda, Brigitte</au><au>Hewins, Roger H.</au><au>Jacob, Damien</au><au>Devouard, Bertrand</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A TEM study of exsolution in Ca‐rich pyroxenes from the Paris and Renazzo chondrites: Determination of type I chondrule cooling rates</atitle><jtitle>Meteoritics & planetary science</jtitle><date>2018-03</date><risdate>2018</risdate><volume>53</volume><issue>3</issue><spage>482</spage><epage>492</epage><pages>482-492</pages><issn>1086-9379</issn><eissn>1945-5100</eissn><abstract>We conducted a transmission electron microscope study of the exsolution microstructures of Ca‐rich pyroxenes in type I chondrules from the Paris CM and Renazzo CR carbonaceous chondrites in order to provide better constraints on the cooling history of type I chondrules. Our study shows a high variability of composition in the augite grains at a submicrometer scale, reflecting nonequilibrium crystallization. The microstructure is closely related to the local composition and is thus variable inside augite grains. For compositions inside the pyroxene miscibility gap, with a wollastonite (Wo) content typically below 40 mole%, the augite grains contain abundant exsolution lamellae on (001). For grain areas with composition close to Wo40, a modulated texture on (100) and (001) is the dominant microstructure, while areas with compositions higher than Wo40 do not show any exsolution microstructure development. To estimate the cooling rate, we used the spacing of the exsolution lamellae on (001), for which the growth is diffusion controlled and thus sensitive to the cooling rate. Despite the relatively homogeneous microstructures of augite grains with Wo < 35 mole%, our study of four chondrules suggests a range of cooling rates from ~10 to ~1000 °C h−1, within the temperature interval 1200–1350 °C. These cooling rates are comparable to those of type II chondrules, i.e., 1–1000 °C h−1. We conclude that the formation of type I and II chondrules in the proto‐solar nebula was the result of a common mechanism.</abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc</pub><doi>10.1111/maps.13032</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0002-8806-8434</orcidid><orcidid>https://orcid.org/0000-0002-8774-1842</orcidid><orcidid>https://orcid.org/0000-0002-4210-7151</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Carbonaceous chondrites Chondrites Chondrule Cooling Cooling rate Crystallization Diffusion rate Earth Sciences Grains Microstructure Miscibility Miscibility gap Nebulae Pyroxenes Sciences of the Universe Solar nebula Temperature Wollastonite |
| title | A TEM study of exsolution in Ca‐rich pyroxenes from the Paris and Renazzo chondrites: Determination of type I chondrule cooling rates |
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