{"id":39046,"date":"2025-09-06T08:41:50","date_gmt":"2025-09-06T06:41:50","guid":{"rendered":"https:\/\/karmaka.de\/?p=39046"},"modified":"2025-09-06T08:41:54","modified_gmt":"2025-09-06T06:41:54","slug":"a-statistical-investigation-into-relationships-between-the-iie-irons-and-the-ordinary-f-and-hh-chondrites","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=39046","title":{"rendered":"A statistical investigation into relationships between the IIE irons and the ordinary, F and \u201cHH\u201d chondrites<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Rachel S. Kirby, Penelope L. King, Andrew G. Tomkins<\/p>\n\n\n\n<p>MAPS, Version of Record online: 05 September 2025<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.70040\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.70040\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;It has been proposed that IIE iron meteorites formed through impact processes on a parent body that was composed of either the H chondrites or a much-debated fourth ordinary chondrite group, the HH chondrites. To resolve this debate, we have compiled a large dataset for the ordinary chondrites, low-fayalite ungrouped chondrites, and IIE irons, and undertaken a statistical analysis to determine if: (1) the current classification of ordinary chondrite groups is statistically appropriate; and (2) the IIE irons are related to H chondrites or if they represent a distinct group that formed on a \u201cHH\u201d chondrite parent body. We demonstrate that the current classification system based on petrography and olivine and orthopyroxene chemistry is appropriate for the H, L, and LL chondrites. We define a fourth \u201cF chondrite\u201d group consisting of eight, previously ungrouped, very low-Fa Type 3 and 4 chondrites. Statistical analysis of \u039417O data alone cannot distinguish between the H chondrites and IIE irons, nor between the L and LL chondrites. Furthermore, statistical analyses are unable to distinguish H chondrites from IIE irons in all measures (mineral chemistry, chondrule size, bulk \u039417O, Ge and Mo isotopic compositions, and bulk siderophile element abundances in metal); there is no evidence for a \u201cHH\u201d chondrite group. These results are consistent with formation of IIE iron meteorites through impact melting and near-surface metal segregation on the H chondrite parent body. This genetic link between H chondrites and IIE irons allows us to understand the geochemical and petrological changes that occurred during planetary formation and evolution.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rachel S. Kirby, Penelope L. King, Andrew G. Tomkins MAPS, Version of Record online: 05 September 2025 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;It has been proposed that IIE iron meteorites formed through impact processes on&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59,1557,6,419,214,7,337,420,127],"tags":[6965,1841,5252,4852,2416,1670,5207,1807],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39046"}],"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=39046"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39046\/revisions"}],"predecessor-version":[{"id":39047,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39046\/revisions\/39047"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39046"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39046"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}