LINK<\/strong><\/a><\/p>\n\n\n\n“The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting that led to metal\u2010silicate segregation, sometimes producing metallic cores. Meteorite paleomagnetic records suggest that crystallization of these cores led to the generation of dynamo magnetic fields. Here we describe the magnetic history of the partially differentiated IIE iron meteorite parent body. This is the first planetesimal for which we have a time\u2010resolved paleomagnetic record constrained by 40Ar\/39Ar chronometry spanning several tens of million years (Ma). We find that the core of the IIE parent body generated a dynamo, likely powered by core crystallization, starting before 78 \u00b1 13 Ma after solar system formation and lasting at least 80 Ma. Such extended core crystallization suggests that the core composed a substantial fraction of the body (\u2273 13\u201020% core\u2010to\u2010body radius ratio depending on the body’s radius), indicating efficient core formation within some partially differentiated planetesimals.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Clara Maurel, James F. J. Bryson, Jay Shah, Rajesh V. Chopdekar, L. T. Elkins\u2010Tanton, C. A. Raymond, Benjamin P. Weiss Geophysical Research LettersFirst published: 11 February 2021 LINK “The existence of numerous iron meteorite groups…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75,72,419,214,219,71],"tags":[93,5638,3701,1670,5207,590,257,1262,1014],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/26166"}],"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=26166"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/26166\/revisions"}],"predecessor-version":[{"id":26167,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/26166\/revisions\/26167"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=26166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=26166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=26166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}