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Science 17 July 2009:
Vol. 325. no. 5938, p. 267
DOI: 10.1126/science.1169695
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Technical Comments

Response to Comment on "Neodymium-142 Evidence for Hadean Mafic Crust"

Jonathan O’Neil1,*, Richard W. Carlson2, Don Francis1 and Ross K. Stevenson3

1 Earth and Planetary Sciences Department, McGill University, 3450 University Street, Montreal, Quebec H3A 2A7, Canada.
2 Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015, USA.
3 GEOTOP (Centre de recherche en géochemie et géodynamique), Université du Québec à Montréal, Post Office Box 8888, Succursale Centre-ville, 210, Président-Kennedy Avenue, Montreal, Quebec H3C 3P8, Canada.


Figure 1
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  		Fig. 1. Plot showing the isotopic compositions of Nd, normalized to 144Nd, measured for the Nuvvuagittuq faux-amphibolites and gabbros (1). The data on the left-hand set of figures are the deviations in each ratio, in ppm, compared with the La Jolla Nd data reported in (1). The data on the right-hand set of figures are again the differences in each ratio (in ppm) compared with the La Jolla Nd data reported in (1), but corrected for the difference in isotopic composition between La Jolla Nd and JNdi Nd reported by (5). The large gray bars in the figures show the external reproducibility of the standard.

 

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Science. ISSN 0036-8075 (print), 1095-9203 (online)