Other
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..761h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 761-764. Research supported by NSF, Michigan M
Other
19
Hydrothermal Systems, Neodymium Isotopes, Ocean Bottom, Scavenging, Sediments, Geophysical Fluids, Oceanography, Rare Earth Elements, Sea Water
Scientific paper
The isotopic composition of Nd is uniform in metalliferous sediments formed at distances varying from greater than 1000 km to within 10 km of the East Pacific Rise paleoridge. These data indicate that hydrothermal vent fluids, despite having concentrations more than 500 times greater, have no effect on the Nd isotopic composition of seawater. This implicates efficient scavenging of hydrothermal Nd by particulates, resulting in extremely short residence times (less than 1 year) close to the hydrothermal vents. Therefore, Nd isotopic studies of ancient seawater precipitates, particularly metalliferous sediments, cannot be used to delimit the magnitude of past hydrothermal circulation without independent constraints on local scavenging rates (or residence times) relative to those of modern oceans.
Davidson Jon P.
Halliday Alex N.
Holden Peter
Olivarez Annette M.
Owen Robert M.
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