{"id":4519,"date":"2015-04-30T19:23:06","date_gmt":"2015-04-30T17:23:06","guid":{"rendered":"http:\/\/karmaka.de\/?p=4519"},"modified":"2015-04-30T19:23:06","modified_gmt":"2015-04-30T17:23:06","slug":"triple-oxygen-isotope-exchange-between-chondrule-melt-and-water-vapor-an-experimental-study","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=4519","title":{"rendered":"Triple oxygen isotope exchange between chondrule melt and water vapor: an experimental study"},"content":{"rendered":"<p>Tommaso Di Rocco, Andreas Pack<\/p>\n<p>Geochimica et Cosmochimica Acta<br \/>\nIn Press, available online 30 April 2015<br \/>\ndoi:10.1016\/j.gca.2015.04.038<\/p>\n<p><a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0016703715002446\" target=\"_blank\"><strong>LINK<\/strong><\/a><\/p>\n<div class=\"su-quote su-quote-style-default\"><div class=\"su-quote-inner su-u-clearfix su-u-trim\">We have conducted time and \u0192O2-dependent oxygen isotope exchange experiments between chondrule analogue melts and H2O in the phase. The aim of our study is to address the question whether the oxygen isotope composition of chondrules is the result of exchange with the ambient nebular gas or has been inherited from the precursor material. The silicate melt-H2O vapor exchange experiments were carried out in a vertical gas-mixing furnace using the metal loop technique at 1500\u00b0C. The duration ranged from 5 to 1440 minutes and \u0192O2 was set between IW-3.8 and IW-1.3 using the H2O\/H2 buffer. Our experiments show that 50% exchange between H2O gas and silicate melt occurs in \u223c4 hours at \u0192O2 = IW-3.8 and in \u223c1 hour at \u0192O2 = IW-1.3. At solar nebula conditions, significant exchange occurs only if chondrule-melting times were several hours.<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Tommaso Di Rocco, Andreas Pack Geochimica et Cosmochimica Acta In Press, available online 30 April 2015 doi:10.1016\/j.gca.2015.04.038 LINK<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56,65],"tags":[1342,1343],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/4519"}],"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=4519"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/4519\/revisions"}],"predecessor-version":[{"id":4520,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/4519\/revisions\/4520"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}