{"id":38059,"date":"2025-04-12T08:12:25","date_gmt":"2025-04-12T07:12:25","guid":{"rendered":"https:\/\/karmaka.de\/?p=38059"},"modified":"2025-04-12T08:12:26","modified_gmt":"2025-04-12T07:12:26","slug":"melting-experiments-of-an-l6-ordinary-chondrite-implications-for-the-formation-of-alkali-rich-achondrites","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=38059","title":{"rendered":"Melting experiments of an L6 ordinary chondrite: Implications for the formation of alkali-rich achondrites"},"content":{"rendered":"\n<p>S. Iannini Lelarge, M. Masotta, L. Folco, T. Ubide, M.D. Suttle, L. Pittarello<\/p>\n\n\n\n<p>Geochemistry, In Press, Journal Pre-proof, Available online 10 April 2025<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0009281925000480\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p>&#8220;Highlights<\/p>\n\n\n\n<ul>\n<li>Experiments show a miscibility gap between Fesingle bondNi metal and S-rich phase at 1\u202fGPa.<\/li>\n\n\n\n<li>Silicate melts resemble Si- and alkali-rich achondrites (e.g., GRA 60128\/9).<\/li>\n\n\n\n<li>Newly crystallised olivine and pyroxenes resemble undifferentiated achondrites.<\/li>\n\n\n\n<li>Si- and alkali-rich liquids form by &lt;25\u202f% partial melting on early chondritic bodies.<\/li>\n\n\n\n<li>Partial melting in planetary embryos may explain alkali-rich achondrites formation.&#8221;<\/li>\n<\/ul>\n\n\n\n<p class=\"justify-text\">&#8220;We conducted high-pressure (1\u202fGPa) melting experiments (1100\u20131400\u202f\u00b0C) on the equilibrated ordinary chondrite DAV 01001 (L6) to investigate partial melting scenarios of planetary embryo in the early solar system. At 1100\u202f\u00b0C, no melting of the silicate phase is observed, and the initial chondritic texture is preserved, but the metallic-sulphidic phases formed two immiscible Fesingle bondNi and S-rich liquids. Melting of silicate minerals began at 1200\u202f\u00b0C, progressing from plagioclase to high-Ca and low-Ca pyroxene and olivine. As melting advanced, the formation of new olivine and low-Ca pyroxene resulted in the production of trachy-andesitic melt at 1200\u202f\u00b0C, basaltic trachy-andesitic melt at 1300\u202f\u00b0C, and andesitic melt at 1400\u202f\u00b0C. These silicate melts have chemical similarities with some anomalous achondrites (e.g., GRA 60128\/9). At the same time, minerals of new formation resemble those of primitive achondrites (e.g., brachinites, ureilites, IAB silicate inclusions, acapulcoites and lodranites). The rapid mineral-liquid re-equilibration suggests that basaltic liquids can form only above 1400\u202f\u00b0C and that relatively high degrees of melting (&gt;20\u202f%) and crystallisation are necessary to explain the observed diversity of achondritic lithologies. These findings suggest that partial melting and recrystallization processes within planetary embryos could have played a critical role in the early solar system, contributing to the early differentiation of planetary bodies and the diversity of achondritic lithologies, including (but not limited to) alkali-rich achondrites.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S. Iannini Lelarge, M. Masotta, L. Folco, T. Ubide, M.D. Suttle, L. Pittarello Geochemistry, In Press, Journal Pre-proof, Available online 10 April 2025 LINK &#8220;Highlights &#8220;We conducted high-pressure (1\u202fGPa) melting experiments (1100\u20131400\u202f\u00b0C) on the equilibrated&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,23,7,73],"tags":[5353,6838,3188,1807,970,1970,1169,3219],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38059"}],"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=38059"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38059\/revisions"}],"predecessor-version":[{"id":38060,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38059\/revisions\/38060"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=38059"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=38059"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=38059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}