{"id":27639,"date":"2021-05-02T10:13:00","date_gmt":"2021-05-02T08:13:00","guid":{"rendered":"https:\/\/karmaka.de\/?p=27639"},"modified":"2021-05-02T10:13:01","modified_gmt":"2021-05-02T08:13:01","slug":"how-do-secondary-iron-enrichments-form-within-basaltic-eucrites-an-experimental-approach","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=27639","title":{"rendered":"How do secondary iron enrichments form within basaltic eucrites? An experimental approach<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Stella Rombeck, Christian Vollmer, Julia Roszjar, Adam R. Sarafian, Stephan Klemme<\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science<br>Version of Record online: 02 May 2021<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.13651\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13651\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Some basaltic eucrites and basaltic lithologies in howardites derived from the asteroid 4 Vesta exhibit unusual secondary veinlet textures consisting mostly of fayalitic olivine and Fe\u2010enrichments within pyroxenes. Recent studies discussed the formation of these Fe\u2010rich phases either by interaction with a vapor and\/or liquid phase (metasomatism), or by a high\u2010temperature melting process. We therefore performed a series of heating and hydrothermal experiments with liquids of different compositions on natural pyroxene crystals (augite and orthopyroxene) to evaluate these contrasting hypotheses. The results of the heating experiments show that incongruent melting of pyroxenes at about 1070 \u00b0C causes textures that are very similar to those observed in the meteorites. We conclude that a part of the natural secondary veins might be explained by heating processes at similar temperatures. The hydrothermal experiments with aqueous liquids of different Fe\u2010enriched compositions clearly indicate ion exchange reactions resulting in partial Fe\u2010enrichments of the pyroxene. Interestingly, these Fe\u2010enrichments occurred independent of the Fe content of the liquid, which can be explained by an internal origin of Fe from the pyroxenes. In one hydrothermal experiment of augite with Fe\u2010oxalate solution, deposition of fayalitic olivine was observed. From our experimental observations, we conclude that aqueous liquids are plausible candidates for explaining the deposition of Fe\u2010enrichments and fayalitic olivine inside the fractures of pyroxene. However, we cannot rule out a high\u2010temperature melting process slightly above the peritectic point of pyroxene to explain a fraction of observed secondary Fe\u2010enrichments. &#8220;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stella Rombeck, Christian Vollmer, Julia Roszjar, Adam R. Sarafian, Stephan Klemme Meteoritics &amp; Planetary ScienceVersion of Record online: 02 May 2021 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Some basaltic eucrites and basaltic lithologies in howardites derived&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,34],"tags":[2826,1823,1822,644],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27639"}],"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=27639"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27639\/revisions"}],"predecessor-version":[{"id":27640,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27639\/revisions\/27640"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27639"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=27639"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=27639"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}