期刊
GEOPHYSICAL RESEARCH LETTERS
卷 34, 期 8, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2006GL029198
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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, Fo(90.7); 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.
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