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Majoritic garnets in Hawaiian Xenoliths: Preliminary results
Author(s) -
Keshav Shantanu,
Sen Gautam
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl012950
Subject(s) - xenolith , geology , pyroxene , mantle (geology) , transition zone , peridotite , geochemistry , olivine , mineralogy
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.