{"id":31386,"date":"2022-10-17T18:08:11","date_gmt":"2022-10-17T16:08:11","guid":{"rendered":"https:\/\/karmaka.de\/?p=31386"},"modified":"2022-10-17T18:09:21","modified_gmt":"2022-10-17T16:09:21","slug":"young-magmatism-and-si-rich-melts-on-mars-as-documented-in-the-enriched-gabbroic-shergottite-nwa-6963","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=31386","title":{"rendered":"Young magmatism and Si-rich melts on Mars as documented in the enriched gabbroic shergottite NWA 6963<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Miles Lindner, Dominik C. Hezel, Axel Gerdes, Horst R. Marschall, Frank E. Brenker<\/p>\n\n\n\n<p>MAPS<br>Version of Record online: 17 October 2022<\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.13917\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13917\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Enriched shergottites contain interstitial Si-rich mesostasis; however, it is unclear whether such mesostasis is formed by impact or magmatic processes. We use laser ablation multicollector inductively coupled plasma mass spectrometry U\u2013Pb measurements of minerals within the interstitial Si-rich mesostasis and of merrillite within the coarse-grained groundmass of Martian-enriched gabbroic shergottite Northwest Africa (NWA) 6963. The date derived of tranquillityite, Cl-apatite, baddeleyite, and feldspar from the Si-rich mesostasis is 172.4\u2009\u00b1\u20096.1\u2009Ma, and the derived merrillite date is 178.3\u2009\u00b1\u200910.6\u2009Ma. We conclude, based on textural observation, that merrillite is a late magmatic phase in NWA 6963, that it was not produced by shock, and that its U\u2013Pb-system was not reset by shock. The indistinguishable dates of the gabbroic merrillite and the minerals within the Si-rich mesostasis in NWA 6963 indicate that the Si-rich mesostasis represents a late-stage differentiated melt produced in the final phase of the magmatic history of the gabbroic rock and not a shock melt. This can likely be transferred to similar Si-rich mesostases in other enriched shergottites and opens the possibility for investigations of Si-rich mesostasis in enriched shergottites to access their magmatic evolution. Our results also provide a crystallization age of 174\u2009\u00b1\u20096\u2009Ma (weighted average) for NWA 6963.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Miles Lindner, Dominik C. Hezel, Axel Gerdes, Horst R. Marschall, Frank E. Brenker MAPSVersion of Record online: 17 October 2022 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Enriched shergottites contain interstitial Si-rich mesostasis; however, it is unclear&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[122,42,43],"tags":[3572,4216,1829],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31386"}],"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=31386"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31386\/revisions"}],"predecessor-version":[{"id":31388,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31386\/revisions\/31388"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}