{"id":40077,"date":"2026-01-30T20:58:20","date_gmt":"2026-01-30T19:58:20","guid":{"rendered":"https:\/\/karmaka.de\/?p=40077"},"modified":"2026-01-30T21:01:37","modified_gmt":"2026-01-30T20:01:37","slug":"lithium-concentrations-and-isotopic-compositions-of-chondrules-%e2%88%92-part-i-type-i-and-type-ii-chondrule-systematics","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=40077","title":{"rendered":"Lithium concentrations and isotopic compositions of chondrules \u2212 Part I: Type I and type II chondrule systematics<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Julia Neukampf, Yves Marrocchi, Johan Villeneuve, Mathieu Roskosz<\/p>\n\n\n\n<p>Geochimica et Cosmochimica Acta, In Press, Journal Pre-proof, Available online 30 January 2026<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0016703726000657\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK + PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;We report high-precision lithium (Li) abundances and isotopic compositions of olivine crystals from type I chondrules in carbonaceous chondrites (Murchison, NWA 852, Renazzo) and type II chondrules in ordinary chondrites (NWA 11752, NWA 12462, NWA 12581, NWA 13501). Olivine crystals in type I chondrules exhibit large Li isotopic fractionations both within and between grains, with \u03b47Li values ranging from \u221246.6\u2030 to\u202f+\u202f9.9\u2030 and Li concentrations of 3.8\u20139.0\u202fppm. Olivine grains in type II chondrules, including Mg-rich relict cores, show \u03b47Li values from \u221238.0\u2030 to\u202f+\u202f8.4\u2030 (Li\u202f=\u202f0.6\u20135.6\u202fppm), while their Fe-rich overgrowths exhibit lower variability, with \u03b47Li values between \u221230.6\u2030 and\u202f+\u202f4.7\u2030 (Li\u202f=\u202f0.6\u201311.9\u202fppm). Our data indicate that the observed variations are not attributable to low-temperature aqueous alteration or dry thermal metamorphism, fractional crystallisation, or simple degassing of the chondrule melt. Instead, the Li isotopic signatures are best explained by kinetic fractionation during open-system gas\u2013melt exchange with a volatile-rich vapour, enriching the chondrule melts in Li. Such open-system processes produced larger isotopic fractionations than expected during closed-system crystallisation. These findings suggest that some type II chondrules may have originated from type I chondrules through reprocessing in an open-system environment, providing new insights into the complex physicochemical evolution of early solar system solids.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Julia Neukampf, Yves Marrocchi, Johan Villeneuve, Mathieu Roskosz Geochimica et Cosmochimica Acta, In Press, Journal Pre-proof, Available online 30 January 2026 LINK + PDF (OPEN ACCESS) &#8220;We report high-precision lithium (Li) abundances and isotopic compositions&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,56,148,18,12,24,7],"tags":[4003,4004,3273,1839,1864,2377,193,2275,107,7050,7051,7052,7053,302,1807,361,1219,1218],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40077"}],"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=40077"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40077\/revisions"}],"predecessor-version":[{"id":40078,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40077\/revisions\/40078"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=40077"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40077"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40077"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}