Oxygen isotope evidence for the origin of pyroxenites in the Beni Bousera peridotite massif, North Morocco: derivation from subducted oceanic lithosphere

Details Oxygen isotope evidence for the origin of pyroxenites in the Beni Bousera peridotite massif, North Morocco: derivation from subducted oceanic lithosphere Oxygen isotope evidence for the origin of pyroxenites in the Beni Bousera peridotite massif, North Morocco: derivation from subducted oceanic lithosphere

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.102..289p&link_type=abstract

Earth and Planetary Science Letters, Volume 102, Issue 3-4, p. 289-301.

Mathematics

Logic

21

Scientific paper

Clinopyroxenes from lithologically diverse pyroxenites, some containing graphite pseudomorphs after diamond, in the Beni Bousera peridotite massif show marked oxygen isotope heterogeneity, δ18O varying from +4.9 to +9.3‰. In contrast, clinopyroxenes from the host peridotites have relatively restricted, typical mantle δ18O values ( +5.3 to +6.1‰). Coexisting clinopyroxene-garnet and clinopyroxene-orthopyroxene mineral pairs from the pyroxenites are in oxygen isotope equilibrium suggesting that the overall δ18O variation is not due to recent disequilibrium/metasomatic processes. The large pyroxenite δ18O variation precludes their derivation from the host peridotites under mantle conditions but may be explained by the pyroxenites crystallising from melts of subducted, hydrothermally altered oceanic lithosphere. This conclusion is supported by the presence of both positive and negative Eu anomalies in pyroxenites which crystallised in the diamond stability field.
Now NERC Isotope Geosciences Laboratory, c/o British Geological Survey, Keyworth, Nottingham NG12 5GG, UK.

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