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Majoritic garnets in Hawaiian Xenoliths: Preliminary results

In this report we present chemical, textural, and spectroscopic information on some mantle garnets from Oahu, Hawaii that have recorded the pyroxene ⇔ garnet transformation. Their textural and compositional characteristics indicate a high pressure origin, consistent with a depth range of 180–270 km, which is much deeper than previously thought (<100 km). One eclogitic xenolith is particularly interesting because its textural and compositional characteristics suggest an origin in the deep upper mantle or the transition zone.