Oxidative precipitation of groundwater‐derived ferrous iron in the subterranean estuary of a coastal bay

Matthew A. Charette; Edward R. Sholkovitz

doi:10.1029/2001gl014512

journal article May 15, 2002

Oxidative precipitation of groundwater‐derived ferrous iron in the subterranean estuary of a coastal bay

Matthew A. Charette Edward R. Sholkovitz

Geophysical Research Letters Vol. 29 No. 10 · American Geophysical Union (AGU)

View at Publisher Save 10.1029/2001gl014512

Abstract

Sediment cores from the intertidal zone of Waquoit Bay (Cape Cod, Massachusetts) yielded iron oxide‐coated sands in the subterranean estuary, which underlies the head of the bay. The oxides were dark red, yellow and orange colors and are formed by the oxidation of ferrous iron‐rich groundwater near the groundwater‐seawater interface. Within these iron oxide‐rich sediments, the concentration of the combined amorphous and crystalline forms of iron oxides ranged between 2500 and 4100 ppm of Fe. These concentrations were 4–6 times greater than the surface sands, and 10–15 times more Fe rich than sands collected from an off‐site location. The precipitation of iron oxides in subterranean estuaries could act as a geochemical barrier by retaining and accumulating certain dissolved chemical species carried to the coast by groundwater. Indeed, phosphorus concentrations in the iron oxide‐rich sands of Waquoit Bay were 5–7 times greater than the overlying surface sands.

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Details

Published: May 15, 2002
Vol/Issue: 29(10)
License: View

Authors

M

Matthew A. Charette

Department of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole MA USA

E

Edward R. Sholkovitz

Department of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole MA USA

Cite This Article

Matthew A. Charette, Edward R. Sholkovitz (2002). Oxidative precipitation of groundwater‐derived ferrous iron in the subterranean estuary of a coastal bay. Geophysical Research Letters, 29(10). https://doi.org/10.1029/2001gl014512

Oxidative precipitation of groundwater‐derived ferrous iron in the subterranean estuary of a coastal bay

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