Evolution of the upper mantle beneath southeast Australia: geochemical evidence from peridotite xenoliths in Mount Leura basanite

Details Evolution of the upper mantle beneath southeast Australia: geochemical evidence from peridotite xenoliths in Mount Leura basanite Evolution of the upper mantle beneath southeast Australia: geochemical evidence from peridotite xenoliths in Mount Leura basanite

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..195c&link_type=abstract

Earth and Planetary Science Letters, Volume 93, Issue 2, p. 195-209.

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Scientific paper

Major and trace element abundances and isotopic ratios (Sr and Nd) of nine spinel peridotite xenoliths from Mount Leura in southeast Australia show that the upper mantle beneath this volcanic center is compositionally and isotopically heterogeneous on the scale of kilometers or less. These xenoliths range from lherzolites overlap with MORB to harzburgites with relative light rare earth enrichment and Sr and Nd isotopic ratios similar to ocean island basalts. Eight of nine whole-rock xenoliths define elongated positive trends in Sr and Nd isochron plots. These trends reflect mixing of depleted and enriched components. Acid-leaching experiments show that the enriched component containing abundant light REE and Sr was incorporated mostly into clinopyroxene. In addition to clinopyroxene, another phase (probably amphibole and phlogopite) is required to account for incompatible element abundances and 87Sr/86Sr ratios in harzburgites. Estimated equilibration temperatures correlate with bulk rock compositions suggesting that the upper mantle may be compositionally zoned, with the uppermost mantle dominated by harzburgites which have been extensively affected by enrichment processes. With increasing depth spinel lherzolites less affected by enrichment processes may be more abundant.

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