{"id":42242,"date":"2026-07-28T08:26:26","date_gmt":"2026-07-28T06:26:26","guid":{"rendered":"https:\/\/karmaka.de\/?p=42242"},"modified":"2026-07-28T08:26:27","modified_gmt":"2026-07-28T06:26:27","slug":"the-first-discovery-of-a-shocked-metasomatised-cv3-chondrule-fragment-in-a-alcu-bearing-micrometeorite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=42242","title":{"rendered":"The first discovery of a shocked, metasomatised CV3 chondrule-fragment in a (Al,Cu)-bearing micrometeorite<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Giovanna Agros\u00ec, Paola Manzari, Daniela Mele, Johan Villeneuve, Tiziano Catelani, Mattew J. Genge, Luca Bindi<\/p>\n\n\n\n<p>MAPS, Version of Record online: 27 July 2026<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.70215\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.70215\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;We report the discovery of the second (Al,Cu)-alloy\u2013bearing micrometeorite, FB-A2, recovered from Mount Gariglione (southern Italy), representing the sixth such occurrence worldwide. Although chondritic in nature, FB-A2 differs markedly from previously described microspherules. It is a scoriaceous micrometeorite dominated by silicates and contains a relict clast composed of Mg-rich olivine and pyroxene phenocrysts set in a Fe-rich silicate matrix. The particle rim hosts fine aggregates of phosphates, magnetite, Ni-bearing magnetite, and sulfides, whereas the interior contains nepheline crystals. A 120\u2009\u03bcm (Al,Cu)-alloy grain occurs at one corner of the particle. The porphyritic texture of the clast indicates a chondrule fragment\u2014the first identified in an (Al,Cu)-bearing micrometeorite\u2014while polyhedral sub-grain boundaries and metal\u2013sulfide veins record shock metamorphism. Iron-rich alteration of relict silicates is consistent with high-temperature (&lt;560 \u00b0C) metasomatism typical of CV3 chondrites and is supported by oxygen isotope compositions close to the Carbonaceous Chondrite Anhydrous Mineral Line. Brecciation of chondrule olivine suggests impact-induced fluid pressure excursions during early Solar System metasomatism, whereas impact melt enveloping elongate olivines indicates a later impact that introduced the (Al,Cu)-alloys. Overall, the texture, mineralogy, and isotopic composition of FB-A2 provide the most detailed constraints yet on the origin of (Al,Cu)-bearing micrometeorites and confirm a genetic link to the Khatyrka meteorite.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Giovanna Agros\u00ec, Paola Manzari, Daniela Mele, Johan Villeneuve, Tiziano Catelani, Mattew J. Genge, Luca Bindi MAPS, Version of Record online: 27 July 2026 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;We report the discovery of the second&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,55,56,3249,14],"tags":[3273,1839,706,1812,146,698,327],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42242"}],"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=42242"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42242\/revisions"}],"predecessor-version":[{"id":42243,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42242\/revisions\/42243"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=42242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=42242"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=42242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}