First terrestrial occurrence of tistarite (Ti2O3): Ultra-low oxygen fugacity in the upper mantle beneath Mount Carmel, Israel

W.L. Griffin, S.E.M. Gain, D.T. Adams, J.X. Huang, Martin Saunders, V. Toledo, N.J. Pearson, S.Y. O'Reilly

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

© 2016 The Authors. The minimum oxygen fugacity (fO2 ) of Earth's upper mantle probably is controlled by metal saturation, as defined by the iron-wüstite (IW) buffer reaction (FeO ? Fe + O). However, the widespread occurrence of moissanite (SiC) in kimberlites, and a suite of superreduced minerals (SiC, alloys, native elements) in peridotites in Tibet and the Polar Urals (Russia), suggest that more reducing conditions (fO2 = 6-8 log units below IW) must occur locally in the mantle. We describe pockets of melt trapped in aggregates of corundum crystals ejected from Cretaceous volcanoes in northern Israel which contain high-temperature mineral assemblages requiring extremely low fO2 (IW <-10). One abundant phase is tistarite (Ti2O3), previously known as a single grain in the Allende carbonaceous chondrite (Mexico) and believed to have formed during the early evolution of the solar nebula. It is associated with other reduced phases usually found in meteorites. The development of super-reducing conditions in Earth's upper mantle may reflect the introduction of CH4 + H2 fluids from the deep mantle, specifically related to deep-seated volcanic plumbing systems at plate boundaries.
Original languageEnglish
Pages (from-to)815-818
Number of pages4
JournalGeology
Volume44
Issue number10
DOIs
Publication statusPublished - Oct 2016

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