Cipriani Anna author Columbia University. Lamont-Doherty Earth Observatory Bonatti Enrico author Columbia University. Lamont-Doherty Earth Observatory W. Carlson Richard author Columbia University. Lamont-Doherty Earth Observatory originator text Articles 2011 English 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. Geochemistry 3 Q03006 1 8 2011 http://dx.doi.org/10.1029/2010GC003415 1525‐2027 http://hdl.handle.net/10022/AC:P:14752 NNC NNC 2012-09-25 16:10:02 -0400 2012-09-26 14:44:09 -0400 8773 eng