Manganese and copper fluxes from continental margin sediments

Journal Article · Fri May 01 04:00:00 EDT 1987 · Geochim. Cosmochim. Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(87)90200-6· OSTI ID:7160129

Heggie, D; Klinkhammer, G; Cullen, D

Total dissolvable Cu and Mn have been measured in sea water collected from the continental shelf of the eastern Bering Sea. Copper concentrations of <3 nmole kg/sup -1/ were measured over the shelf break but concentrations increased to >4 nmole kg/sup -1/ inshore of a hydrographic front over the 100 m isobath. Manganese concentrations also were low over the shelf break, <10 nmole kg/sup -1/, and increased systematically to concentrations >10 nmole kg/sup -1/ inshore of the hydrographic front. Depth distributions of Mn at all continental shelf stations showed gradients into the sediments, with concentrations typically >20 nmole kg/sup -1/ in a bottom layer extending about 30 m off the bottom. Benthic Cu and Mn fluxes are indicated by cross-shelf pore water profiles that show interfacial concentrations more than an order of magnitude greater than in bottom water. These data and the results of a model of metal transport across the shelf suggest that Cu and Mn fluxes, estimated at 2 and 18 nmole cm/sup -2/y/sup -1/, respectively, from continental shelf sediments may be one source of these metals to the deep sea.

• Research Organization: Univ. of Rhode Island, Narragansett (USA)
• OSTI ID: 7160129
• Journal Information: Geochim. Cosmochim. Acta; (United States), Journal Name: Geochim. Cosmochim. Acta; (United States) Vol. 51:5; ISSN GCACA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
BERING SEA
CHEMICAL COMPOSITION
CHEMISTRY
CONTINENTAL MARGIN
COPPER
ELEMENTS
GEOCHEMISTRY
GROUND WATER
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
MANGANESE
MASS TRANSFER
MATHEMATICAL MODELS
METALS
OXYGEN COMPOUNDS
PACIFIC OCEAN
SEAS
SEAWATER
SEDIMENTS
SURFACE WATERS
TRANSITION ELEMENTS
WATER
WATER CHEMISTRY