{"id":38801,"date":"2025-07-28T16:20:20","date_gmt":"2025-07-28T14:20:20","guid":{"rendered":"https:\/\/karmaka.de\/?p=38801"},"modified":"2025-07-28T16:20:22","modified_gmt":"2025-07-28T14:20:22","slug":"magnesium-phosphate-in-the-cold-bokkeveld-cm2-carbonaceous-chondrite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=38801","title":{"rendered":"Magnesium phosphate in the Cold Bokkeveld (CM2) carbonaceous chondrite<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Martin R. Lee, Tobias Salge, Ian Maclaren<\/p>\n\n\n\n<p>MAPS, Version of Record online: 28 July 2025<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.70018\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.70018\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Hydrous Mg-phosphate was first described from astromaterials in particles returned from the C-type asteroid Ryugu, and has subsequently been found in samples of the B-type asteroid Bennu and CI1 carbonaceous chondrites. This phase may have been highly significant as a source of bioessential compounds for early Earth. Here, we describe Mg-phosphate from a petrologic type 1 clast (called \u201cC1MP\u201d) in the Cold Bokkeveld CM2 carbonaceous chondrite. This clast has a fine-grained serpentine\u2013saponite matrix that in addition to the Mg-phosphate contains magnetite, Mg-Fe carbonate, calcite, pentlandite, transjordanite, eskolite, and daubr\u00e9elite\/zolenskyite. The Mg-phosphate grains are 7\u201336\u2009\u03bcm in size and together constitute 0.27% of the clast by area. They have a \u201ccracked\u201d texture in scanning electron microscope images, and scanning transmission electron microscopy (STEM) shows that they are highly porous suggesting alteration of originally hydrous grains. The Mg-phosphate has Mg\/P and Na\/P ratios (atom%) of 1.02 and 0.25, respectively, along with minor concentrations of C, S, Cl, K, Ca, and Fe. Nitrogen was sought because ammonia has been reported from Ryugu Mg-phosphate, but none was detected by X-ray or electron spectroscopy. 4D-STEM shows that the C1MP clast&#8217;s Mg-phosphate is amorphous, and radial distribution function analysis of electron diffraction patterns reveals that its P-O and Mg-P bonding distances are comparable to newberyite (MgHPO4.3H2O). The C1MP clast&#8217;s Mg-phosphate formed from late-stage alkaline brines and subsequently underwent dehydration, amorphization, and partial loss of Na in response to heating in its parent body and\/or during laboratory analysis.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Martin R. Lee, Tobias Salge, Ian Maclaren MAPS, Version of Record online: 28 July 2025 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Hydrous Mg-phosphate was first described from astromaterials in particles returned from the C-type asteroid Ryugu,&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,18,11,2243],"tags":[3872,5789,3991,3273,1809,4006,105,1054,6949],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38801"}],"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=38801"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38801\/revisions"}],"predecessor-version":[{"id":38802,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38801\/revisions\/38802"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=38801"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=38801"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=38801"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}