LINK<\/strong><\/a><\/p>\n\n\n\n“Erg Cech 002 (EC 002) is an andesitic achondrite, the earliest formed achondrite identified to date, and is a rare sample of primary melts that formed crusts on the first generation(s) of planetesimals. Given that EC 002 represents a primary or primitive melt and that H and F are incompatible during silicate partial melting, EC 002 may be a H- and F-rich material relative to previously studied achondrites. We measured the H2O (total H quantified as H2O) and F contents of low-Ca pyroxene xenocrysts (\u223c4\u2013 12\u202f\u00b5g\/g H2O; <0.5\u202f\u00b5g\/g\u202fF), groundmass augite (\u223c5 \u2013 10\u202f\u00b5g\/g H2O; <2.2\u202f\u00b5g\/g\u202fF), albitic feldspar (\u223c2\u2013 5\u202f\u00b5g\/g H2O; <0.5\u202f\u00b5g\/g\u202fF), and a silica-rich phase (\u223c28\u2013 30\u202f\u00b5g\/g H2O; \u223c0.7\u2013 2.5\u202f\u00b5g\/g\u202fF) in EC 002 by Nanoscale Secondary Ion Mass Spectrometry. We use a single-stage equilibrium batch melting model to provide a first-order reconstruction of the EC 002 parent body H2O (\u223c7\u2013 200\u202f\u00b5g\/g H2O) and F (\u223c0.44\u2013 2.4\u202f\u00b5g\/g\u202fF) contents, which are depleted relative to chondrites and the bulk Earth. This requires the first generation(s) of planetesimals to have either accreted from volatile-poor materials or undergone extensive volatile loss, supporting the idea that Earth acquired its H2O budget from thermally primitive materials.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Liam D. Peterson, Megan E. Newcombe, Conel M.O\u2019D. Alexander, Jianhua Wang, Sune G. Nielsen Geochimica et Cosmochimica ActaIn Press, Journal Pre-proof, Available online 17 April 2025 LINK “Erg Cech 002 (EC 002) is an andesitic…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,73,507],"tags":[3514,5833,5832,2598,2089,4315,257,2285],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38134"}],"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=38134"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38134\/revisions"}],"predecessor-version":[{"id":38135,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38134\/revisions\/38135"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=38134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=38134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=38134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}