{"id":31193,"date":"2022-08-23T23:46:00","date_gmt":"2022-08-23T21:46:00","guid":{"rendered":"https:\/\/karmaka.de\/?p=31193"},"modified":"2022-08-28T23:53:21","modified_gmt":"2022-08-28T21:53:21","slug":"isotopically-heavy-micrometeorites-fragments-of-cy-chondrite-or-a-new-hydrous-parent-body","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=31193","title":{"rendered":"Isotopically Heavy Micrometeorites \u2014 Fragments of CY Chondrite or a New Hydrous Parent Body?<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>M. D. Suttle, L. Folco, Z. Dionnet, M. Van Ginneken, T. Di Rocco, A. Pack, M. Scheel, A. Rotundi<\/p>\n\n\n\n<p>JGR Planets<br>First published: 22 August 2022<\/p>\n\n\n\n<p><a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2021JE007154\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/epdf\/10.1029\/2021JE007154\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p>&#8220;Key Points<\/p>\n\n\n\n<ul><li>Combined bulk O-isotopes and micro-CT allow the provenance of cosmic dust grains to be inferred with confidence<\/li><li>Particles from a 16O-poor source represent either a new group of carbonaceous chondrites or an extension of the CY chondrite range<\/li><li>These particles define the pre-atmospheric O-isotope composition of a previously reported collection of anomalous cosmic spherules&#8221;<\/li><\/ul>\n\n\n\n<p class=\"justify-text\">&#8220;Cosmic dust grains sample a diverse range of solar system small bodies. This includes asteroids that are not otherwise represented in our meteorite collections. In this work we obtained 3D images of micrometeorite interiors using tomography before collecting destructive high-precision oxygen isotope measurements. These data allow us to link textures in unmelted micrometeorites to known chondrite groups. In addition to identifying particles from ordinary chondrites, CR and CM chondrites we report two micrometeorites derived from an anomalous 16O-poor source (\u03b417O: +16.4\u2030, \u03b418O: +28.4\u2030, and \u039417O: +1.4\u2030). Their compositions overlap with a previously reported micrometeorite (TAM50-25) from Suttle et al. (2020), https:\/\/doi.org\/10.1016\/j.epsl.2020.116444 (EPSL: 546:116444). These particles represent hydrated carbonaceous chondrite material derived either from a new group or from the CY chondrites (thereby extending the isotopic range of this group). In either scenario they demonstrate close petrographic and isotopic connections to the CO-CM chondrite clan. Furthermore, their position in O-isotope space makes them the most likely candidate for the parent body of the anomalous \u201cgroup 4\u201d cosmic spherules previously reported by Suavet et al. (2010), https:\/\/doi.org\/10.1016\/j.epsl.2010.02.046 (EPSL: 293:313-320) and several subsequent isotopic studies. We conclude that the \u201cgroup 4\u201d cosmic spherules originate from hydrated C-type asteroid parents.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M. D. Suttle, L. Folco, Z. Dionnet, M. Van Ginneken, T. Di Rocco, A. Pack, M. Scheel, A. Rotundi JGR PlanetsFirst published: 22 August 2022 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Key Points Combined bulk O-isotopes&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,11,5044,3157,65],"tags":[2958,3273,3275,2907,1381,4823,2220,327,1845],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31193"}],"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=31193"}],"version-history":[{"count":3,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31193\/revisions"}],"predecessor-version":[{"id":31197,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31193\/revisions\/31197"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}