Geochemistry of manganese in the northeast Pacific Ocean off Washington

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Limnol. Oceanogr.; (United States)

DOI:https://doi.org/10.4319/lo.1985.30.1.0081· OSTI ID:5649834

Jones, C J; Murray, J W

Water collected along a transect normal to the coast of Washington was analyzed for dissolved and total dissolvable manganese (TDM). The vertical profiles exhibit the same general features observed elsewhere in the Pacific, but a horizontal section of the transect shows that concentrations increase markedly toward the continental margin. A surface maximum is probably due to fluvial inputs, especially from the Columbia River. Another possible source is the upwelling of manganese-enriched bottom water over the shelf. Horizontal gradients are also observed in the oxygen minimum as manganese concentrations decrease from the continental slope to open ocean water. Porewater and solid phase data suggest that manganese is being actively remobilized under reducing conditions in the slope sediments and is diffusing into the overlying seawater at a rate sufficient to balance losses by vertical mixing and particulate scavenging. Two stations on opposite sides of the Juan de Fuca Ridge have deep concentration maxima that are almost certainly due to injections of hydrothermal vent fluid along the ridge.

• Research Organization: Univ. of Washington, Seattle
• OSTI ID: 5649834
• Journal Information: Limnol. Oceanogr.; (United States), Journal Name: Limnol. Oceanogr.; (United States) Vol. 30:1; ISSN LIOCA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
CHEMICAL ANALYSIS
CHEMISTRY
COASTAL WATERS
FEDERAL REGION X
GEOCHEMISTRY
HYDROGEN COMPOUNDS
MANGANESE COMPOUNDS
MINERAL CYCLING
NORTH AMERICA
OXYGEN COMPOUNDS
PACIFIC OCEAN
SEAS
SEAWATER
SURFACE WATERS
TRACE AMOUNTS
TRANSITION ELEMENT COMPOUNDS
UPWELLING
USA
WASHINGTON
WATER