LINK<\/strong><\/a><\/p>\n\n\n\n“Giant micrometeorites (MMs; 400\u20132000 \u00b5m) are exceedingly rare and scientifically valuable. Three\u2010dimensional nondestructive characterization by X\u2010ray computed tomography (X\u2010CT) provides information on the petrography and thus petrogenesis of MMs and serves as a guide to maximize subsequent multi\u2010analytical studies on such precious planetary materials. Here, we discuss the results obtained by X\u2010CT on 22 giant MMs and the classification based on their 3\u2010D density contrast images. Scoriaceous and unmelted MMs have distinct porosity ranges (10\u201340 vol% versus 0\u201325 vol%, respectively). We observe a porosity variation inside scoriaceous MMs, which allows their atmospheric entry flight history to be resolved. For the first time, spinning entry is explicitly demonstrated for four partially melted MMs. Furthermore, we are able to resolve the thermal gradient in a single particle, based on porosity variation (seen as a progressive increase in pore abundance and size with higher peak temperatures). Moreover, we explore parent body alteration through the 3\u2010D analysis of pores distribution, showing that shock fabrics are either absent or weakly developed in our data set. Finally, owing to the detection of pseudomorphic chondrules, we estimate that the intensively aqueously altered C1 or CI\u2010like material could represent 18% of the MM flux at this size fraction (400\u20131000 \u00b5m).”<\/p>\n","protected":false},"excerpt":{"rendered":"
Zelia Dionnet, Martin D. Suttle, Andrea Longobardo, Alessandra Rotundi, Luigi Folco, Vincenzo Della Corte, Andrew King Meteoritics & Planetary ScienceVersion of Record online:23 June 2020 LINK “Giant micrometeorites (MMs; 400\u20132000 \u00b5m) are exceedingly rare and…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,3157],"tags":[4382,2337,1809,327,1605],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22446"}],"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=22446"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22446\/revisions"}],"predecessor-version":[{"id":22447,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22446\/revisions\/22447"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=22446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=22446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=22446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}