LINK<\/strong><\/a><\/p>\n“Highlights<\/p>\n
\u2022 Distinct zircon growth intervals require different episodes of magma generation.
\n\u2022 Magmatic activity on 4 Vesta lasted for at least \u223c35 Myr.
\n\u2022 Zircon Hf\u2013W closure temperature demonstrates robustness against thermal resetting.
\n\u2022 Prolonged magmatism requires an early formed thermally insulating crust on 4 Vesta.
\n\u2022 Large planetesimals must have accreted within 4 Myr of the start of the Solar System.”<\/p>\n
“The asteroid 4 Vesta is the second most massive planetesimal in the Solar System and a rare example of a planetary object that possibly can be linked to a specific group of differentiated meteorites, the howardite\u2013eucrite\u2013diogenite suite. The 182Hf\u2013182W chronometry of individual zircon grains from six basaltic eucrites revealed distinct growth episodes ranging from 4532 \u2212 11 \/ + 6 Ma to 4565.0 \u00b1 0.9 Ma and constrains the early thermal history of 4 Vesta, indicating that its mantle generated basaltic melts for at least 35 million years (Myr). Initially, the energy needed for melting was provided by decay of short-lived isotopes, mostly 26Al. The long duration of magmatism despite the short lifetime of 26Al implies that the asteroid must have accreted within the first \u223c4 Myr of Solar System formation, similar to the formation of iron meteorite parent bodies, and that its interior must have been thermally well insulated by an early-formed crust that prevented heat loss.”<\/p>\n","protected":false},"excerpt":{"rendered":"
J. Roszjar, M.J. Whitehouse, G. Srinivasan, K. Mezger, E.E. Scherer, J.A. Van Orman, A. Bischoff Earth and Planetary Science Letters Volume 452, 15 October 2016, Pages 216\u2013226 LINK “Highlights \u2022 Distinct zircon growth intervals require…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,33,186],"tags":[852,2541,3183,1823,422,370,184],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9632"}],"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=9632"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9632\/revisions"}],"predecessor-version":[{"id":9634,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9632\/revisions\/9634"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9632"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9632"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9632"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}