Selenium isotope systematics of mid-ocean-ridge basalts and implications for the long-term volatile and chalcophile record of the crust–mantle system

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dc.contributor.advisor König, Stephan (Dr.)
dc.contributor.author Yierpan, Aierken
dc.date.accessioned 2019-11-28T10:35:26Z
dc.date.available 2019-11-28T10:35:26Z
dc.date.issued 2021-11-22
dc.identifier.uri http://hdl.handle.net/10900/95208
dc.identifier.uri http://nbn-resolving.de/urn:nbn:de:bsz:21-dspace-952081 de_DE
dc.identifier.uri http://dx.doi.org/10.15496/publikation-36591
dc.description.abstract Selenium is a chalcophile, moderately volatile and redox-sensitive element. The Se isotopic and elemental systematics of mantle-derived rocks and melts may therefore provide new approaches to study the terrestrial volatile origin and evolution as well as secular changes of redox conditions across the surface and mantle reservoirs. Selenium is significantly depleted in mantle samples (at ng/g levels), posing analytical challenges for Se isotopic studies of the igneous system. This study presents an analytical protocol suitable for precise and accurate determination of Se isotope and Se–Te abundances of igneous rocks. The Se–Te elemental systematics provide a petrogenetic context for interpreting Se isotope systematics. The new method was used to analyze a suite of basaltic glasses from the Pacific–Antarctic ridge (PAR) and the Mid-Atlantic ridge (MAR). The magmatic differentiation involving concurrent sulfide segregation results in significant chalcophile element fractionation but no measurable Se isotopic variation. Because of the demonstrated lack of Se isotopic fractionation between sulfides and silicate melt, the Se isotope systematics of MORB reflects a source signature. The southern MAR displays a significant source heterogeneity due to the localized interaction between the ridge and Shona and Discovery mantle plumes that incorporate recycled components. en
dc.language.iso en de_DE
dc.publisher Universität Tübingen de_DE
dc.rights ubt-podok de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=de de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=en en
dc.subject.classification Geochemie , Gesteinskunde , Selen , Tellurium , Sulfur de_DE
dc.subject.ddc 500 de_DE
dc.subject.ddc 550 de_DE
dc.subject.other Petrologie de_DE
dc.subject.other Se Isotopes en
dc.subject.other Selenium en
dc.subject.other Isotopes Geochemistry en
dc.subject.other Mantle Geochemistry en
dc.subject.other Petrology en
dc.title Selenium isotope systematics of mid-ocean-ridge basalts and implications for the long-term volatile and chalcophile record of the crust–mantle system en
dc.type PhDThesis de_DE
dcterms.dateAccepted 2019-11-22
utue.publikation.fachbereich Geographie, Geoökologie, Geowissenschaft de_DE
utue.publikation.fakultaet 7 Mathematisch-Naturwissenschaftliche Fakultät de_DE
utue.publikation.noppn yes de_DE

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