Nonchondritic 142Nd in suboceanic mantle peridotites

Articles:

Title:: Nonchondritic 142Nd in suboceanic mantle peridotites
Author(s):: Cipriani, Anna
Bonatti, Enrico
W. Carlson, Richard
Date:: 2011
Type:: Articles
Department:: Lamont-Doherty Earth Observatory
Volume:: 3
Permanent URL:: http://hdl.handle.net/10022/AC:P:14752
Book/Journal Title:: Geochemistry, Geophysics, Geosystems
Abstract:: The discovery that several solid Earth reservoirs have a superchondritic 142Nd/144Nd 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 142Nd/144Nd. We determined the 142Nd/144Nd 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 142Nd/144Nd ratios in line with mantle-derived material measured to date, except for some ancient cratonic rocks.
Subject(s):: Geochemistry
DOI:: http://dx.doi.org/10.1029/2010GC003415