Rare earth elements in Saanich Inlet, British Columbia, a seasonally anoxic basin

Details Rare earth elements in Saanich Inlet, British Columbia, a seasonally anoxic basin Rare earth elements in Saanich Inlet, British Columbia, a seasonally anoxic basin

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2561g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 10, pp.2561-2571

Physics

7

Scientific paper

Rare earth element and manganese distributions have been investigated in Saanich Inlet, British Columbia, a seasonally anoxic basin. Redox cycling of Ce and Mn takes place across an oxic/ suboxic boundary approximately 20 m shallower than the O 2 / H 2 S interface; the remaining, strictly trivalent REE undergo scavenging above this oxic/suboxic boundary and regeneration from dissolving host phases below it. These processes result in pronounced removal of Ce from solution above the oxic/suboxic boundary due to oxidative precipitation along with preferential uptake of the lighter trivalent REE during scavenging. Below the oxic/suboxic boundary, regeneration of particulate-REE into solution leads to a less pronounced Ce-depletion and a less pronounced HREE-enrichment in the anoxic bottom waters. Dissolved REE concentrations in the sediment pore waters exhibit an approximately ten-fold increase across the seawater-sediment interface but then decrease with increasing depth, indicating removal from solution during later diagenesis. Calculated diffusive fluxes of the REE and Mn from the sediments into the overlying anoxic water column are insufficient to account for the accumulated trace metal enrichments observed in the water column. We propose an annual redox cycle for Saanich Inlet in which flushing causes extensive oxidative precipitation and scavenging of trace elements from the water column each autumn. The same material is rapidly regenerated from the underlying near-surface sediments when the basin next turns anoxic.

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