LINK<\/strong><\/a><\/p>\n“Highlights<\/p>\n
\u2022 High-resolution X-ray maps reveal different populations of olivine in chondrules.
\n\u2022 High-current microprobe analyses allow relict olivine grains to be characterized.
\n\u2022 Relict olivine crystals in chondrules are Ca\u2013Al\u2013Ti-poor but show varying \u039417\u039417O.
\n\u2022 Chondrules result from nebular condensate melting and gas\u2013melt interactions.
\n\u2022 Host olivine grains formed via gas-assisted epitaxial growth on relict olivine.”<\/p>\n
“FeO-poor (type I) porphyritic chondrules formed by incomplete melting of solid dust precursors via a yet-elusive mechanism. Two settings are generally considered for their formation: (i) a nebular setting where primordial solids were melted, e.g. by shock waves propagating through the gas and (ii) a collisional planetary setting. Here we report a method combining high-current electron microprobe X-ray mapping and quantitative measurements to determine the chemical characteristics of relict olivine grains inherited from chondrule precursors. We find that these olivine crystals are Ca\u2013Al\u2013Ti-poor relative to host olivine crystals. Their variable \u039417\u039417O, even in individual chondrule, is inconsistent with derivation from planetary interiors as previously argued from 120\u2009\u00b0 triple junctions also exhibited by the chondrules studied herein. This indicates that chondrule precursors correspond to solid nebular condensates formed under changing physical conditions.<\/p>\n
We propose that porphyritic chondrules formed during gas-assisted melting of nebular condensates comprising relict olivine grains with varying \u039417\u039417O values and Ca\u2013Al\u2013Ti-rich minerals such as those observed within amoeboid olivine aggregates. Incomplete melting of chondrule precursors produced Ca\u2013Al\u2013Ti-rich melts (CAT-melts), allowing subsequent crystallization of Ca\u2013Al\u2013Ti-rich host olivine crystals via epitaxial growth on relict olivine grains. Incoming MgO and SiO from the gas phase induced (i) the dilution of CAT-melts, as attested by the positive Al\u2013Ti correlation observed in chondrule olivine crystals, and (ii) buffering of the O-isotope compositions of chondrules, as recorded by the constant \u039417\u039417O values of host olivine grains. The O-isotopic compositions of host olivine grains are chondrule-specific, suggesting that chondrules formed in an array of environments of the protoplanetary disk with different \u039417\u039417O values, possibly due to variable solid\/gas mixing ratios.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Yves Marrocchi, Johan Villeneuve, Valentina Batanova, Laurette Piani, Emmanuel Jacquet Earth and Planetary Science Letters Volume 496, 15 August 2018, Pages 132\u2013141 LINK “Highlights \u2022 High-resolution X-ray maps reveal different populations of olivine in chondrules….<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56,148,1607],"tags":[1839,1864,1611,3277],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/15086"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=15086"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/15086\/revisions"}],"predecessor-version":[{"id":15087,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/15086\/revisions\/15087"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}