Ion microprobe analyses bearing on the composition of the upper mantle beneath the Basin and Range and Colorado Plateau provinces

Details Ion microprobe analyses bearing on the composition of the upper mantle beneath the Basin and Range and Colorado Plateau provinces Ion microprobe analyses bearing on the composition of the upper mantle beneath the Basin and Range and Colorado Plateau provinces

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9814091r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B8, p. 14,091-14,108.

Other

15

Chemical Composition, Earth Mantle, Peridotite, Rare Earth Elements, Magma, Melting, Petrology

Scientific paper

Results are presented of ion microbrobe analyses of light and heavy rare earth elements (LREE and HREE) of clinopyroxene from spinel-bearing peridotite xenolites from the Basin and Range Province (Black Canyon, Lunar Crater localities) and the Colorado Plateau (Buell Park, Green Knobs localities), two of the prominent units (based on elevation, geomorphology, and tectonics) of the continental crust of the American southwest. It is found that the clinopyroxenes from spinel facies peridotites from both provinces are highly variable (by 2-3 orders of magnitude) in LREE and HREE, Sr, Zr, and Ti contents. However, LREE-enriched clinopyroxenes or those with chondritic REE patterns predominate at the Basin and Range localities and LREE-depleted clinopyroxenes predominate at the Colorado Plateau localities. The bulk of the peridotites from the Colorado Plateau are interpreted to be residues from partial melting; the association of these peridotites with LREE-depleted websterites reinforces the link between modern oceanic lithosphere and the upper mantle beneath the Colorado Plateau. On the other hand, the predominance of LREE-enriched peridotites in the Basin and Range localities is consistent with the widespread Cenozoic volcanism of the area and is probably a consequence of that volcanism.

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