{"id":40045,"date":"2026-01-23T19:22:55","date_gmt":"2026-01-23T18:22:55","guid":{"rendered":"https:\/\/karmaka.de\/?p=40045"},"modified":"2026-01-23T19:22:56","modified_gmt":"2026-01-23T18:22:56","slug":"alkali-recondensation-into-chondrules-2","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=40045","title":{"rendered":"Alkali recondensation into chondrules<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Emmanuel Jacquet, Yves Marrocchi, S\u00e9bastien Charnoz<\/p>\n\n\n\n<p>Icarus, In Press, Journal Pre-proof, Available online 23 January 2026<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0019103526000369\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK + PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p>&#8220;Highlights<\/p>\n\n\n\n<ul>\n<li>Alkalis recondensed into chondrules after olivine crystallization.<\/li>\n\n\n\n<li>Solid density in chondrule-forming regions constrained to 10-6\u00b11 kg\/m.<\/li>\n\n\n\n<li>Chondrules formed in settled dust disk near pressure bumps.&#8221;<\/li>\n<\/ul>\n\n\n\n<p class=\"justify-text\">&#8220;While sub-mm melt droplets should rapidly lose alkali elements in a vacuum at liquidus temperatures, chondrules are only modestly depleted in them (by less than one order of magnitude). The detection of sodium in olivine cores has previously suggested very high saturating partial pressures of gaseous<br>sodium, but we show that alkalis were lost during heating and recondensed at lower temperatures, essentially in the present-day chondrule mesostases. This recondensation was accompanied by mass-dependent enrichment in light isotopes (for multi-isotope alkalis such as K and Rb), but its limited extent<br>indicates a cooling acceleration (or &#8220;quenching&#8221;). The isotopic fractionation also constrains the ratio of the chondrule density and the cooling rate prior to the quench around 10\u22126 kg.m\u22123.K\u22121.h suggesting  ensities above \u223c 10\u22126 kg\/m3. In a nebular context, this is achievable by radial and vertical concentrations near pressure bumps.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Emmanuel Jacquet, Yves Marrocchi, S\u00e9bastien Charnoz Icarus, In Press, Journal Pre-proof, Available online 23 January 2026 LINK + PDF (OPEN ACCESS) &#8220;Highlights &#8220;While sub-mm melt droplets should rapidly lose alkali elements in a vacuum at&#8230;<\/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],"tags":[1839,1864,767,1658,6415,2161],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40045"}],"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=40045"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40045\/revisions"}],"predecessor-version":[{"id":40046,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40045\/revisions\/40046"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=40045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}