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Distribution and sources of pre-anthropogenic lead isotopes in deep ocean water from Fe-Mn crusts

Geochimica et Cosmochimica Acta

By:
, , and
DOI: 10.1016/S0016-7037(96)00310-9

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Abstract

The lead isotope composition of ocean water is not well constrained due to contamination by anthropogenic lead. Here the global distribution of lead isotopes in deep ocean water is presented as derived from dated (ca. 100 ka) surface layers of hydrogenetic Fe-Mn crusts. The results indicate that the radiogenic lead in North Atlantic deep water is probably supplied from the continents by river particulates, and that lead in Pacific deep water is similar to that characteristic of island and continental volcanic arcs. Despite a short residence time in deep water (80-100 a), the isotopes of lead appear to be exceedingly well mixed in the Pacific basin. There is no evidence for the import of North Atlantic deep water-derived lead into the Pacific ocean, nor into the North Indian Ocean. This implies that the short residence time of lead in deep water prohibits advection over such long distances. Consequently, any climate-induced changes in deep-water flow are not expected to result in major changes in the seawater Pb-isotope record of the Pacific Ocean.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Distribution and sources of pre-anthropogenic lead isotopes in deep ocean water from Fe-Mn crusts
Series title:
Geochimica et Cosmochimica Acta
DOI:
10.1016/S0016-7037(96)00310-9
Volume
60
Issue:
24
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochimica et Cosmochimica Acta
First page:
4957
Last page:
4963
Number of Pages:
7