Combined chemical and high-precision isotope analysis of silicate melt inclusions – Advancing the understanding of Earth’s heterogeneous mantle
Final Report Abstract
The most important scientific advances that emerged from the project was the discovery and establishment of the much greater isotopic variability of mantle derived melts as manifested by olivine hosted melt inclusions from the Azores, Tristan da Cunha and Gough Island and Hawai’i. All studied locations reveal that large heterogeneity is captured within single eruptions (lava flows) and that the mantle sources of OIB are indeed more heterogeneous than displayed by the compositions of bulk rocks. Further studies from many different OIB and MORB settings are strongly requested as these will improve our current understanding not only on magma genesis, but on the geodynamic cycles that form the surface of Earth and other rocky planets. Due to their small size – most inclusions were 50 micrometres or smaller – the amount of the analyte extractable was often too small (<<30 pg of Nd, <500 of Sr) to be measured for isotope ratios. Instead, several inclusions as captured in single olivine crystals were analysed. Nevertheless, by comparison to the host lavas, the new isotope data from melt inclusions obtained during this study reveal isotopic variability extending that of the erupted lavas. Severe restrictions led to some interruptions during the analytical work of the project.
Publications
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Process-related isotope variability in oceanic basalts revealed by high-precision Sr isotope ratios in olivine-hosted melt inclusions. Chemical Geology, 524, 1-10.
Genske, Felix; Stracke, Andreas; Berndt, Jasper & Klemme, Stephan
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Ubiquitous ultra-depleted domains in Earth’s mantle. Nature Geoscience, 12(10), 851-855.
Stracke, Andreas; Genske, Felix; Berndt, Jasper & Koornneef, Janne M.
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Mantle Source Heterogeneity Inferred from Olivine-Hosted Melt Inclusions. Goldschmidt Abstracts, 214-214. Geochemical Society.
Böhnke, Mischa; Genske, Felix & Stracke, Andreas
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Deciphering Isotopic Mantle Heterogeneity beneath Tristan da Cunha using Olivine-hosted Melt Inclusions 2021, V41C-04.
Böhnke, Mischa; Genske, Felix & Stracke, Andreas
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Silicate melt inclusions in the new millennium: A review of recommended practices for preparation, analysis, and data presentation. Chemical Geology, 570, 120145.
Rose-Koga, E.F.; Bouvier, A.-S.; Gaetani, G.A.; Wallace, P.J.; Allison, C.M.; Andrys, J.A.; Angeles de la Torre, C.A.; Barth, A.; Bodnar, R.J.; Bracco, Gartner A.J.J.; Butters, D.; Castillejo, A.; Chilson-Parks, B.; Choudhary, B.R.; Cluzel, N.; Cole, M.; Cottrell, E.; Daly, A.; Danyushevsky, L.V. ... & Zhou, T.
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Isotopic and chemical analysis of individual melt inclusions. Goldschmidt2022 abstracts. European Association of Geochemistry.
Böhnke, Mischa; Genske, Felix; Berndt, Jasper & Stracke, Andreas
