LINK<\/strong><\/a><\/p>\n“Highlights<\/p>\n
\u2022 Olivine grain growth in metal matrix is faster when metal is partially molten.
\n\u2022 Rounded-olivine pallasites can form by annealing of olivine fragments in Fe\u2013Ni\u2013S.
\n\u2022 Early mixing in planetesimals can yield mixed type pallasites.”<\/p>\n
“The origin of pallasites has been the focus of a number of recent studies. Yet, their formation process remains elusive, while the mechanism leading to the genesis of the sub-group termed \u2018mixed type\u2019 pallasites (containing polygonal, rounded, and fragmental olivines simultaneously) is unclear. Here we test the hypothesis of mixing of olivine fragments with Fe\u2013Ni\u2013S after a non-destructive impact followed by annealing employing both experimental analogues and numerical models.<\/p>\n
The experimental series evidenced that the addition of sulfur to olivine + Fe\u2013Ni accelerates olivine grain growth, though the growth rate is reduced when Fe\u2013Ni\u2013S is not fully molten. This is shown to be the consequence of competing growth of olivine and Fe\u2013Ni grains.<\/p>\n
Numerical models satisfying available formation constraints from natural samples indicate that planetesimals with radii \u2265200 km are favorable for the genesis of rounded olivine-bearing pallasites by annealing of fragments in partially molten Fe\u2013Ni\u2013S. Moreover, early mixing in the planetesimal can form regions containing olivine grains with different grain sizes that could explain the formation of mixed-type pallasites.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Giulio F.D. Solferino, Gregor J. Golabek Earth and Planetary Science Letters Volume 504, 15 December 2018, Pages 38-52 LINK “Highlights \u2022 Olivine grain growth in metal matrix is faster when metal is partially molten. \u2022…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[810,2580],"tags":[292,1894,4276,257],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16582"}],"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=16582"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16582\/revisions"}],"predecessor-version":[{"id":16583,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16582\/revisions\/16583"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}