Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3408302a&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 8, CiteID L08302
Physics
5
Mineralogy And Petrology: Mid-Oceanic Ridge Processes (1032, 8416), Mineralogy And Petrology: Magma Genesis And Partial Melting (1037), Mineralogy And Petrology: Mantle Processes (1038)
Scientific paper
A piece of wehrlite, containing about 20 volume % of clinopyroxene, was found in harzburgite in a drill core of ODP Leg 147 from Hess Deep near the East Pacific Rise. Minerals are as refractory (olivine, Fo90.7; spinel, Cr# = 0.52) as those in the harzburgite. The clinopyroxene is depleted in REE (rare earth elements), being similar in chondrite-normalized pattern for middle to heavy REE to that of the harzburgite. The calculated melt in equilibrium with the clinopyroxene is as depleted as ultra-depleted MORB melts ever documented. The wehrlite is a cumulate from an in-situ segregated ultra-depleted MORB melt. Dimension of individual masses of the ultra-depleted MORB involved may be at least as large as a few tens of centimeters. The Hess Deep wehrlite is different from the lower crustal wehrlite from the ocean floor or some ophiolites, which is either a cumulate or a peridotite/melt reaction product.
Arai Shoji
Takemoto Y.
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