{"id":16934,"date":"2018-12-14T14:46:52","date_gmt":"2018-12-14T13:46:52","guid":{"rendered":"http:\/\/karmaka.de\/?p=16934"},"modified":"2018-12-16T12:03:15","modified_gmt":"2018-12-16T11:03:15","slug":"the-alteration-history-of-the-jbilet-winselwan-cm-carbonaceous-chondrite-an-analog-for-c%e2%80%90type-asteroid-sample-return","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=16934","title":{"rendered":"The alteration history of the Jbilet Winselwan CM carbonaceous chondrite: An analog for C\u2010type asteroid sample return<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>A. J. King, S. S. Russell, P. F. Schofield, E. R. Humphreys\u2010Williams, S. Strekopytov, F. A. J. Abernethy, A. B. Verchovsky, M. M. Grady<\/p>\n\n\n\n<p>Meteorit Planet Sci. doi:10.1111\/maps.13224<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13224\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br>\n<a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13224\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Jbilet Winselwan is one of the largest CM carbonaceous chondrites available for study. Its light, major, and trace elemental compositions are within the range of other CM chondrites. Chondrules are surrounded by dusty rims and set within a matrix of phyllosilicates, oxides, and sulfides. Calcium\u2010 and aluminum\u2010rich inclusions (CAIs) are present at \u22641 vol% and at least one contains melilite. Jbilet Winselwan is a breccia containing diverse lithologies that experienced varying degrees of aqueous alteration. In most lithologies, the chondrules and CAIs are partially altered and the metal abundance is low (&lt;1 vol%), consistent with petrologic subtypes 2.7\u20132.4 on the Rubin et al. (2007) scale. However, chondrules and CAIs in some lithologies are completely altered suggesting more extensive hydration to petrologic subtypes \u22642.3. Following hydration, some lithologies suffered thermal metamorphism at 400\u2013500 \u00b0C. Bulk X\u2010ray diffraction shows that Jbilet Winselwan consists of a highly disordered and\/or very fine\u2010grained phase (73 vol%), which we infer was originally phyllosilicates prior to dehydration during a thermal metamorphic event(s). Some aliquots of Jbilet Winselwan also show significant depletions in volatile elements such as He and Cd. The heating was probably short\u2010lived and caused by impacts. Jbilet Winselwan samples a mixture of hydrated and dehydrated materials from a primitive water\u2010rich asteroid. It may therefore be a good analog for the types of materials that will be encountered by the Hayabusa\u20102 and OSIRIS\u2010REx asteroid sample\u2010return missions.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A. J. King, S. S. Russell, P. F. Schofield, E. R. Humphreys\u2010Williams, S. Strekopytov, F. A. J. Abernethy, A. B. Verchovsky, M. M. Grady Meteorit Planet Sci. doi:10.1111\/maps.13224 LINK (OPEN ACCESS) PDF (OPEN ACCESS) &#8220;Jbilet&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,2350,9,18,2243,552],"tags":[3991,3273,105,4780,752,4781],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16934"}],"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=16934"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16934\/revisions"}],"predecessor-version":[{"id":16938,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16934\/revisions\/16938"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16934"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16934"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}