Open-system O-isotope behaviour and trace element enrichment in the sub-Eifel mantle

Details Open-system O-isotope behaviour and trace element enrichment in the sub-Eifel mantle Open-system O-isotope behaviour and trace element enrichment in the sub-Eifel mantle

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..89..273k&link_type=abstract

Earth and Planetary Science Letters, Volume 89, Issue 3-4, p. 273-287.

Computer Science

18

Scientific paper

Spinel peridotites from the West Eifel, western Germany exhibit a wide range of δ18OSMOW values for olivine ( +5.1 to +6.3‰), smaller ranges for pyroxenes ( +5.7 to +6.3‰ for orthopyroxene; +5.6 to +6.4‰ for clinopyroxene) and variable 18O/16O fractionations between olivine and pyroxenes (Δclinopyroxene-olivine = +0.6 to -0.3‰ and Δorthopyroxene-olivine = +0.7 to -0.1‰). These features are characteristic of a disequilibrium distribution of O-isotopes between coexising olivine and pyroxenes. Enrichment in 18O is observed primarily in olivine from amphibole and/or phlogopite-bearing peridotites and correlates with degree of LREE/HREE enrichment, indicating that the processes responsible for trace element enrichment (i.e. mantle metasomatism) and O-isotope disequilibrium are linked. The 18O- and incompatible trace element-enriched fluid(s) cannot be generated by intra-mantle fractionation processes as presently understood, and are attributed to recycling of altered oceanic lithosphere and/or pelagic sediments into the mantle via subduction. This is supported by δDSMOW values for associated Eifel amphibole and mica ( -50 to -45‰ respectively) which fall midway between δD values for upper mantle ( -80‰) and seawater (0‰). Coexisting amphibole and mica also have distinctly different δ18O values ( +7.0 and +5.9‰, respectively) which suggests that they did not originate from the same fluids/melts. This implies that the sub-Eifel mantle has experienced at least two distinct metasomatic episodes.

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