{"id":188821,"date":"2025-02-28T10:36:58","date_gmt":"2025-02-28T15:36:58","guid":{"rendered":"https:\/\/web.uri.edu\/gso\/?p=188821"},"modified":"2025-02-28T10:36:58","modified_gmt":"2025-02-28T15:36:58","slug":"marine-geology-and-geophysics-seminar-march-7","status":"publish","type":"post","link":"https:\/\/web.uri.edu\/gso\/uncategorized\/marine-geology-and-geophysics-seminar-march-7\/","title":{"rendered":"Marine Geology and Geophysics Seminar, March 7"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Speaker<\/h3>\n\n\n\n<p><strong><em><a href=\"https:\/\/sites.google.com\/brown.edu\/dr-james-w-dottin-iii\">James Dottin III, Ph.D.,<\/a> Assistant Professor, Brown University<\/em><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hydrogen Isotopic Evidence for a Core Component in Baffin Island Lavas<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Abstract<\/h3>\n\n\n\n<p>The nature of chemical exchange between Earth\u2019s core and mantle is fundamental to understanding their evolution. Tungsten-182 and helium-3 anomalies in volcanic rocks from deeply sourced mantle plumes have been attributed to core-mantle exchange. Hydrogen (H) is potentially abundant in the core. Therefore, H may also be a sensitive tracer of core-mantle exchange. We measured 2H\/1H ratios (reported as \u03b4D) in olivine-hosted basaltic melt inclusions from a Baffin Island lava to test whether mantle plumes contain H from the core. The average \u03b4D value (\u2013144 \u00b1 24\u2030) is lower than some estimates for average depleted upper mantle (\u03b4D \u2248 \u221260 \u00b1 20\u2030). The low \u03b4D composition likely derives from isotopic diffusion or H leakage from the core, not isotopic fractionation during magmatism or crustal contamination. Over geologic time, core-mantle exchange of H may have overprinted the isotopic composition of mantle plume source regions and much of the upper mantle.<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Speaker James Dottin III, Ph.D., Assistant Professor, Brown University Hydrogen Isotopic Evidence for a Core Component in Baffin Island Lavas Abstract The nature of chemical exchange between Earth\u2019s core and mantle is fundamental to understanding their evolution. Tungsten-182 and helium-3 anomalies in volcanic rocks from deeply sourced mantle plumes have been attributed to core-mantle exchange. [&hellip;]<\/p>\n","protected":false},"author":2120,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[1],"tags":[],"class_list":["post-188821","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/posts\/188821","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/users\/2120"}],"replies":[{"embeddable":true,"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/comments?post=188821"}],"version-history":[{"count":1,"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/posts\/188821\/revisions"}],"predecessor-version":[{"id":188822,"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/posts\/188821\/revisions\/188822"}],"wp:attachment":[{"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/media?parent=188821"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/categories?post=188821"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/web.uri.edu\/gso\/wp-json\/wp\/v2\/tags?post=188821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}