{"id":34579,"date":"2023-11-27T19:38:44","date_gmt":"2023-11-27T18:38:44","guid":{"rendered":"https:\/\/karmaka.de\/?p=34579"},"modified":"2023-11-27T19:38:45","modified_gmt":"2023-11-27T18:38:45","slug":"the-impact-history-and-prolonged-magmatism-of-the-angrite-parent-body","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=34579","title":{"rendered":"The impact history and prolonged magmatism of the angrite parent body<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>B. G. Rider-Stokes, M. Anand, L. F. White, J. R. Darling, R. Tart\u00e8se, M. J. Whitehouse, I. Franchi, R. C. Greenwood, G. Degli-Alessandrini<\/p>\n\n\n\n<p>MAPS<br>Version of Record online: 27 November 2023<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.14102\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.14102\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;As some of the oldest differentiated materials in our solar system, angrite meteorites can provide unique insights into the earliest stages of planetary evolution. However, the timing of planetary mixing, as evidenced by oxygen isotope variations in the quenched angrites, and the extent of magmatism on the angrite parent body (APB) remain poorly understood. Here, we report on microstructurally guided in situ geochemical and Pb\u2013Pb isotopic measurements on angrites aimed at better understanding of the timing and nature of magmatic processes, as well as impact events, on the APB. The quenched angrite Northwest Africa (NWA) 12320 yielded a Pb\u2013Pb date of 4571.2\u2009\u00b1\u20099.4\u2009Ma, which we interpret as corresponding to the timing of planetary mixing. The only known shocked quenched angrite, NWA 7203, also yielded an ancient Pb\u2013Pb date of 4562.9\u2009\u00b1\u20099.3\u2009Ma, which is identical to the Pb\u2013Pb date of 4563.6\u2009\u00b1\u20097.9\u2009Ma obtained for the texturally intermediate angrite NWA 10463. Pb\u2013Pb analyses in phosphates in the dunitic angrite NWA 8535 yielded a much younger date of 4514\u2009\u00b1\u200930\u2009Ma, representing the youngest Pb\u2013Pb date ever recorded for an angrite. Based on the evidence from the lack of shock deformation, olivine major and trace element compositions, and no apparent contamination in the oxygen isotope composition of NWA 8535, our findings are consistent with prolonged magmatism on the APB. This finding is consistent with a large size for the APB.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>B. G. Rider-Stokes, M. Anand, L. F. White, J. R. Darling, R. Tart\u00e8se, M. J. Whitehouse, I. Franchi, R. C. Greenwood, G. Degli-Alessandrini MAPSVersion of Record online: 27 November 2023 LINK (OPEN ACCESS)PDF (OPEN ACCESS)&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1825,1208,2436,6024,4984,977,649,5425],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/34579"}],"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=34579"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/34579\/revisions"}],"predecessor-version":[{"id":34580,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/34579\/revisions\/34580"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=34579"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=34579"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=34579"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}