LINK<\/strong><\/a><\/p>\n“Hydrogen isotopic ratio and water concentration have been measured with the NanoSIMS in olivine, pyroxene and mesostasis phases in individual chondrules from the carbonaceous chondrites Paris (CM2), Renazzo (CR2) and ordinary chondrite Bishunpur (LL3). On average, chondrule pyroxenes in Renazzo, Bishunpur and Paris contain 893\u00b1637 ppm (1SD), 879\u00b1536 ppm and 791\u00b1227 ppm H2O. Chondrule olivines from Renazzo and Bishunpur vary from 156\u00b144 ppm to 222\u00b1123 ppm. Olivines in the Paris chondrules have high water concentration (603\u00b1145 to 1051\u00b1253 ppm H2O) with a minimum mean value of 645\u00b199 ppm. \u03b4D ranges from -212\u00b1125\u2030 to 15\u00b1156\u2030 and from -166\u00b1133\u2030 to 137\u00b1176\u2030 in Renazzo and Bishunpur chondrule olivines, pyroxenes and mesostases, respectively. In Paris chondrules, \u03b4D ranges from -398\u00b123\u2030 to 366\u00b135\u2030; this represents an extreme variation over 764\u2030. Paris olivines and pyroxenes are either enriched or depleted in deuterium relative to the mesostasis and no systematic isotopic pattern is observed. Simple model of chondrules hydration during parent body hydrothermal alteration is difficult to reconcile with such isotopic heterogeneity. It is proposed that a hydrous component, having a \u03b4D of c.a. -400\u2030, in the chondrule precursors, has been outgassed at 800-900\u00b0C in the gas phase. Nevertheless, a residual water fraction remains trapped in Paris chondrules. Quantitative modeling supports this scenario.”<\/p>\n","protected":false},"excerpt":{"rendered":"
A. Stephant, L. Remusat, F. Robert Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 25 November 2016 LINK “Hydrogen isotopic ratio and water concentration have been measured with the NanoSIMS in olivine, pyroxene…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,56,18,81],"tags":[493,106,3273,1839,105,304,361,1855],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/10653"}],"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=10653"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/10653\/revisions"}],"predecessor-version":[{"id":10654,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/10653\/revisions\/10654"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10653"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}