Mineralogical Controls on the Ti Isotope Composition of Subduction Zone Magmas

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dc.identifier.uri http://dx.doi.org/10.15488/15366
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/15486
dc.contributor.author Kommescher, S.
dc.contributor.author Kurzweil, F.
dc.contributor.author Fonseca, R.O.C.
dc.contributor.author Rzehak, L.J.A.
dc.contributor.author Hohl, S.V.
dc.contributor.author Kirchenbaur, M.
dc.contributor.author Schuth, S.
dc.contributor.author Sprung, P.
dc.contributor.author Münker, C.
dc.date.accessioned 2023-11-20T07:06:50Z
dc.date.available 2023-11-20T07:06:50Z
dc.date.issued 2023
dc.identifier.citation Kommescher, S.; Kurzweil, F.; Fonseca, R.O.C.; Rzehak, L.J.A.; Hohl, S.V. et al.: Mineralogical Controls on the Ti Isotope Composition of Subduction Zone Magmas. In: Geochemistry, Geophysics, Geosystems (G3) 24 (2023), Nr. 8, e2022GC010840. DOI: https://doi.org/10.1029/2022gc010840
dc.description.abstract The positive Ti isotope versus SiO2-content correlation in igneous rocks reflects the fractional crystallization of Ti-bearing oxide minerals. However, Ti isotope variations of subduction-related igneous rocks indicate that the Ti isotope compositions of their mantle sources are heterogeneous and additional mineral phases may promote Ti isotope fractionation. We have determined the Ti isotope composition of well-characterized subduction-related basalts, andesites and boninites. Samples from the Solomon Islands, the Troodos ophiolite in Cyprus, and Cape Vogel in Papua New Guinea show small but resolvable variations that may be related to differences in their mantle sources. Specifically, the δ49Ti of boninites (+0.109‰ to +0.168‰) is slightly higher than that of tholeiites (−0.027‰ to +0.111‰) from the same localities (Troodos in Cyprus and Cape Vogel in Papua New Guinea). Modeling suggests the partial melting of progressively depleted mantle sources where residual Cr-spinel plays a greater role in controlling the Ti budget during partial melting. More pronounced variations in δ49Ti are clearly linked to the fractional crystallization of Ti-oxides: Samples from Rabaul Volcanic Complex (New Britain, Papua New Guinea) show increasing δ49Ti (up to +0.373‰) with increasing Ti/V and decreasing Dy/Yb. Fractional crystallization models suggest that oxide minerals and amphibole are needed to sufficiently increase the δ49Ti of these magmas. Our study highlights that the combination of diagnostic trace element patterns and Ti isotope compositions in subduction-related igneous rocks can be a powerful tool to constrain petrogenetic processes and to discriminate between different crystallizing mineral phases. eng
dc.language.iso eng
dc.publisher Hoboken, NJ : Wiley
dc.relation.ispartofseries Geochemistry, Geophysics, Geosystems (G3) 24 (2023), Nr. 8
dc.rights CC BY-NC-ND 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0
dc.subject stable isotopes eng
dc.subject subduction zones eng
dc.subject Titanium eng
dc.subject.ddc 550 | Geowissenschaften
dc.title Mineralogical Controls on the Ti Isotope Composition of Subduction Zone Magmas eng
dc.type Article
dc.type Text
dc.relation.essn 1525-2027
dc.relation.issn 1525-2027
dc.relation.doi https://doi.org/10.1029/2022gc010840
dc.bibliographicCitation.issue 8
dc.bibliographicCitation.volume 24
dc.bibliographicCitation.firstPage e2022GC010840
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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