143Nd/144Nd in Pacific ferromanganese encrustations and nodules

Details 143Nd/144Nd in Pacific ferromanganese encrustations and nodules 143Nd/144Nd in Pacific ferromanganese encrustations and nodules

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..81....7a&link_type=abstract

Earth and Planetary Science Letters, Volume 81, Issue 1, p. 7-14.

Physics

4

Scientific paper

143Nd/144Nd ratios have been measured in Fe-Mn encrustations and nodules taken from a wide area of the Pacific and over a large depth range. Over much of the Pacific, ɛNd(0) values fall between -2.5 and -5.0, similar to values for Nd presently dissolved at mid-depth in the Pacific. Deposits forming within the realm of Antarctic Bottom Water (AABW) are distinctly less radiogenic (ɛNd(0) = -6.0 to -7.5) and appear to have sampled Nd both from ambient AABW (ɛNd(0) = -8.5) and from higher in the water column (ɛNd(0) = +0.3 to -4.5). Samples drilled from 50 to 65 mm within one crust are chemically and isotopically distinct from surface layers of the same crust. The isotope values suggest that the mid-depth Pacific may have previously exhibited a less radiogenic Nd isotope signal than that presently observed.

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