{"id":4035,"date":"2021-02-10T11:33:17","date_gmt":"2021-02-10T02:33:17","guid":{"rendered":"http:\/\/eriweb.site\/en\/?p=4035"},"modified":"2021-04-08T11:34:00","modified_gmt":"2021-04-08T02:34:00","slug":"diffusion-creep-of-diopside","status":"publish","type":"post","link":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/4035\/","title":{"rendered":"Diffusion creep of diopside"},"content":{"rendered":"\n<p class=\"has-text-align-center\">Subhajit Ghosh(Institut des Sciences de la Terre d\u2019Orl\u00e9ans), Sanae Koizumi, Takehiko Hiraga <br>Journal of Geophysical Research: Solid Earth, <a rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1029\/2020JB019855\" target=\"_blank\">https:\/\/doi.org\/10.1029\/2020JB019855<\/a><\/p>\n\n\n\n<p>  We have conducted uniaxial compression experiments on fine\u2010grained diopside with either 4 or 10 vol% forsterite and 10 vol% anorthite. We changed the average grain size in the diopside with forsterite aggregate from 0.43 to 4.07 \u03bcm to reveal the grain size sensitivity of the creep rate. Mechanical data were obtained at a stepped load for a temperature range of 1050 to 1170\u00b0C. The observed strain rates are best explained by stress and grain size exponent values of 1 and 2, respectively, and activation energy of \u223c720 kJ\/mol, which indicates lattice diffusion creep. Anorthite bearing aggregate is \u223c3 times weaker than forsterite\u2010bearing aggregate, probably due to the presence of aluminium. We have compared previously reported diffusion creep rates of diopside in nondimensional stress and strain\u2010rate space, constructed based on our diffusion creep law. It demonstrates that all the earlier mechanical data are well summarized by our diffusion creep flow law.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-content\/uploads\/sites\/2\/2021\/02\/\u56f3\uff11.jpg\" alt=\"\" class=\"wp-image-3104\" width=\"580\" height=\"621\" \/><figcaption>Arrhenius plot of strain rate as a function of 10000\/<em>T<\/em>&nbsp;of dry diopside (this study), Fe\u2010olivine (Yabe &amp; Hiraga,&nbsp;<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2020JB019855#jgrb54624-bib-0047\">2020<\/a>; Yabe et&nbsp;al.,&nbsp;<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2020JB019855#jgrb54624-bib-0048\">2020<\/a>) (Y), Fe\u2010free olivine (Nakakoji et&nbsp;al.,&nbsp;<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2020JB019855#jgrb54624-bib-0035\">2018<\/a>) (N), enstatite (Bruijn &amp; Skemer,&nbsp;<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2020JB019855#jgrb54624-bib-0005\">2014<\/a>) (B&amp;S), and anorthite (Rybacki &amp; Dresen,&nbsp;<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2020JB019855#jgrb54624-bib-0038\">2000<\/a>) (R&amp;D) in the diffusion creep regime are shown. All the plots are fixed to&nbsp;<em>d<\/em>&nbsp;=&nbsp;10&nbsp;\u03bcm and&nbsp;<img decoding=\"async\" alt=\"urn:x-wiley:21699313:media:jgrb54624:jgrb54624-math-0092\" src=\"https:\/\/agupubs.onlinelibrary.wiley.com\/cms\/asset\/6dcbfa19-2cae-4f6a-890e-7e76e68c8429\/jgrb54624-math-0092.png\">&nbsp;=&nbsp;30&nbsp;MPa.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Subhajit Ghosh(Institut des Sciences de la Terre d\u2019Orl\u00e9ans), Sanae Koizumi, Takehiko Hiraga Journal of Geophys &hellip; <a href=\"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/4035\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Diffusion creep of diopside&#8221;<\/span><\/a><\/p>\n","protected":false},"author":9,"featured_media":4036,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-4035","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"_links":{"self":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/4035"}],"collection":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/comments?post=4035"}],"version-history":[{"count":1,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/4035\/revisions"}],"predecessor-version":[{"id":4037,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/4035\/revisions\/4037"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/media\/4036"}],"wp:attachment":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=4035"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/categories?post=4035"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/tags?post=4035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}