PUMA
Istituto di Scienze Marine     
Cipriani A., Bonatti E., Carlson R. W. Nonchondritic Nd-142 in suboceanic mantle peridotites. In: Geochemistry Geophysics Geosystems, vol. 12 article n. Q03006. AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA, 2011.
 
 
Abstract
(English)
The discovery that several solid Earth reservoirs have a superchondritic Nd-142/Nd-144 ratio led to the hypothesis that either the bulk silicate Earth is not chondritic or that a subchondritic reservoir lies hidden somewhere within the Earth's interior. One important reservoir, i.e., mid-ocean ridge peridotites representing the main component of the upper oceanic mantle and the source of mid-ocean ridge basalt, has never been tested for Nd-142/Nd-144. We determined the Nd-142/Nd-144 ratio in clinopyroxene separated from two peridotites and a pyroxenite from the SW Indian Ridge and one peridotite from the northern Mid-Atlantic Ridge. All samples analyzed have superchondritic Nd-142/Nd-144 ratios in line with mantle-derived material measured to date, except for some ancient cratonic rocks.
DOI: 10.1029/2010GC003415
Subject EARLY EARTH DIFFERENTIATION
ENRICHED HADEAN RESERVOIR
MID-ATLANTIC RIDGE
ABYSSAL PERIDOTITES


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