LINK<\/strong><\/a><\/p>\n\n\n\n“Five silica\u2010rich objects (SRO) from Acfer 182 were studied. They have cryptocrystalline textures characterized by micro\u2010emulsion and amoeboid patterns that point toward the coexistence of pyroxene\u2010 and silica\u2010normative liquids that were quenched. Both objects have variable contents of refractory lithophile elements. Their positive Yb versus La correlation around primordial values suggests a cosmochemical process (e.g., a gas\/liquid condensation) as responsible for SRO formation. The bulk trace element abundances of amoeboid\u2010 and emulsion\u2010type SRO as well as their fractionation do not support an origin through high temperature processes. Conversely, their formation might have taken place while cooling of the nebular gas in two different chondrule\u2010forming regions characterized by having different evolution paths. Cooling of these dust\u2010enriched regions might lead to the condensation of pyroxene\u2010rich liquids first, followed by formation of Mg\u2010rich and SiO2\u2010rich liquids, provided irradiation and annealing were active in these regions. Irradiation could be the process involved both in the formation of cristobalite (with annealing ~1200 K) and in triggering a spinoidal decomposition causing unmixing of the enstatite liquid into two coexisting phases, such as Mg\u2010rich and SiO2\u2010rich liquids, the precursors of the SRO in Acfer 182. Formation of emulsion\u2010 and amoeboid\u2010type objects may be the result of exposing those chondrule\u2010forming regions to different degrees of radiation.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Maria Eugenia Varela Meteoritics & Planetary ScienceVersion of Record online:30 June 2020 LINK “Five silica\u2010rich objects (SRO) from Acfer 182 were studied. They have cryptocrystalline textures characterized by micro\u2010emulsion and amoeboid patterns that point toward…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,583,55],"tags":[4235,3273,1887,1864,5589],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22509"}],"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=22509"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22509\/revisions"}],"predecessor-version":[{"id":22510,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22509\/revisions\/22510"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=22509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=22509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=22509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}