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Isotopic variation in Semail Ophiolite lower crust reveals crustal-level melt aggregation

Research output: Contribution to journalArticle

  • Maximiliaan Jansen
  • Johan Lissenberg
  • Martijn Klaver
  • Sietze de Graaff
  • Janne Koornneef
  • Richard Smeets
  • Christopher MacLeod
  • Gareth Davies
Original languageEnglish
Pages (from-to)37-42
Number of pages6
JournalGeochemical Perspectives Letters
Volume8
Early online date5 Nov 2018
DOIs
DateAccepted/In press - 10 Oct 2018
DateE-pub ahead of print - 5 Nov 2018
DatePublished (current) - Nov 2018

Abstract

The scale and magnitude of compositional heterogeneity in the mantle has important implications for the understanding of the evolution of Earth. Heterogeneity of the upper mantle is often evaluated based on mid-ocean ridge basalt compositions, despite their homogenisation prior to eruption. In this study we present Nd and Sr isotope data obtained by micro-drilling single plagioclase and clinopyroxene crystals in gabbroic cumulates of the Semail Ophiolite (Oman) and show that mantle source variability is better preserved in the lower crust than in the extrusive suite. Analysis of sub-nanogram quantities of Nd in plagioclase revealed a range in 143Nd/144Ndi in the Wadi Abyad crustal section that is three times greater than recorded in the extrusive suite. The isotopic variability is preserved in plagioclase, whereas clinopyroxene is isotopically homogeneous. These data imply that the mantle is heterogeneous on the scale of melt extraction, and that a significant proportion of homogenisation of erupted melts occurs in the oceanic crust, not the mantle.

    Research areas

  • lower oceanic crust, fast-spreading ridge, Semail Ophiolite, isotope geochemistry, Mantle heterogeneity

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via EAG at https://www.geochemicalperspectivesletters.org/article1827 . Please refer to any applicable terms of use of the publisher.

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