Oxygen isotopes in coexisting garnets, clinopyroxenes and phlogopites of Roberts Victor eclogites: implications for petrogenesis and mantle metasomatism

Details Oxygen isotopes in coexisting garnets, clinopyroxenes and phlogopites of Roberts Victor eclogites: implications for petrogenesis and mantle metasomatism Oxygen isotopes in coexisting garnets, clinopyroxenes and phlogopites of Roberts Victor eclogites: implications for petrogenesis and mantle metasomatism

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..83...80o&link_type=abstract

Earth and Planetary Science Letters, Volume 83, Issue 1-4, p. 80-84.

Computer Science

16

Scientific paper

δ18O values of coexisting garnet, clinopyroxene and phlogopite for twelve compositionally and texturally diverse Roberts Victor eclogite xenoliths range from +3.8 to +7.1, +4.0 to +7.4 and +5.9 to +7.4, respectively. Differences between the δ18O values of coexisting garnets and clinopyroxenes are normally zero; however, there is some variation in the δ18O values of different fractions of the same mineral in four samples which suggests the presence of isotopic zonation and inhomogeneity, possibly resulting from the introduction of a secondary fluid which metasomatized the eclogites and resulted in the formation of phlogopite, amphibole and celsian. The δ18O value of the metasomatic fluid is generally buffered by the isotopic composition of the primary garnet and clinopyroxene, as indicated by a correlation between the isotopic composition of phlogopite and the primary pyroxene and garnet.
The large range in δ18O values of the eclogites and the similarity in the isotopic composition of coexisting pyroxene and garnet support the interpretation that the Roberts Victor eclogites represent metamorphosed, altered basalts. The eclogites were subjected to infiltration metasomatism in the mantle prior to their incorporation in the kimberlite, and the source of this fluid was probably unrelated to the eclogite.

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