{"id":13390,"date":"2017-07-27T09:45:42","date_gmt":"2017-07-27T07:45:42","guid":{"rendered":"http:\/\/karmaka.de\/?p=13390"},"modified":"2017-07-27T09:45:42","modified_gmt":"2017-07-27T07:45:42","slug":"titanium-isotopes-and-rare-earth-patterns-in-cais-evidence-for-thermal-processing-and-gas-dust-decoupling-in-the-protoplanetary-disk","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=13390","title":{"rendered":"Titanium isotopes and rare earth patterns in CAIs: evidence for thermal processing and gas-dust decoupling in the protoplanetary disk"},"content":{"rendered":"<p>Andrew M. Davis, Junjun Zhang, Nicolas D. Greber, Jingya Hu, Fran\u00e7ois L.H. Tissot, Nicolas Dauphas<\/p>\n<p>Geochimica et Cosmochimica Acta<br \/>\nIn Press, Accepted Manuscript, Available online 27 July 2017<\/p>\n<p><a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0016703717304568\" target=\"_blank\"><strong>LINK<\/strong><\/a><\/p>\n<p>&#8220;Titanium isotopic compositions (mass-dependent fractionation and isotopic anomalies) were measured in 46 calcium-, aluminum-rich inclusions (CAIs) from the Allende CV chondrite. After internal normalization to 49Ti\/47Ti, we found that \u03b550Ti values are somewhat variable among CAIs, and that \u03b546Ti is highly correlated with \u03b550Ti, with a best-fit slope of 0.162\u00b10.030 (95% confidence interval). The linear correlation between \u03b546Ti and \u03b550Ti extends the same correlation seen among bulk solar objects (slope 0.184\u00b10.007). This observation provides constraints on dynamic mixing of the solar disk and has implications for the nucleosynthetic origin of titanium isotopes, specifically on the possible contributions from various types of supernovae to the solar system. Titanium isotopic mass fractionation, expressed as \u03b4\u203249Ti, was measured by both sample-standard bracketing and double-spiking. Most CAIs are isotopically unfractionated, within a 95% confidence interval of normal, but a few are significantly fractionated and the range \u03b4\u203249Ti is from \u223c\u20134 to \u223c+4. Rare earth element patterns were measured in 37 of the CAIs. All CAIs with significant titanium mass fractionation effects have group II and related REE patterns, implying kinetically controlled volatility fractionation during the formation of CAIs with those REE patterns.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Andrew M. Davis, Junjun Zhang, Nicolas D. Greber, Jingya Hu, Fran\u00e7ois L.H. Tissot, Nicolas Dauphas Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 27 July 2017 LINK &#8220;Titanium isotopic compositions (mass-dependent fractionation and&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,72,71],"tags":[1846,397,2735],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13390"}],"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=13390"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13390\/revisions"}],"predecessor-version":[{"id":13391,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13390\/revisions\/13391"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13390"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}