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A Climate-Related Oxidizing Event in Deep-Sea Sediment from the Bering Sea

Published online by Cambridge University Press:  20 January 2017

James V. Gardner ,
Walter E. Dean ,
David H. Klise  and
Jack G. Baldauf
James V. Gardner
Affiliation:
U.S. Geological Survey, Menlo Park, California 94025
Walter E. Dean
Affiliation:
U.S. Geological Survey, Denver, Colorado 80225
David H. Klise
Affiliation:
U.S. Geological Survey, Menlo Park, California 94025
Jack G. Baldauf
Affiliation:
U.S. Geological Survey, Menlo Park, California 94025
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Abstract

Many cores from the deep basins of the Bering Sea have a thin oxidized zone within otherwise reduced sediment. This oxidized zone began to form about 6000 yr ago and represents an interval of about 3200 yr. Mineralogically, the oxidized and reduced sediments are similar, but chemically they differ. Concentrations of Fe and C are lower, and concentrations of Mn, Ba, Co, Mo, and Ni are higher in the oxidized than in the reduced sediment. Mn is enriched about 10-fold in the oxidized zone relative to its concentration in the reduced sediment, Mo about threefold, and Ba, Co, and Ni about twofold. These data suggest that the oxidized zone developed diagenetically as the result of the balance between the flux of organic matter and the available dissolved oxygen in bottom and interstitial waters.

We propose that the Bering Sea was substantially ice covered when global glacial conditions prevailed. during the transition to global interglacial conditions, seasonal meltwater from thawing sea ice formed a lens of fresh water that decreased organic productivity. During the winter seasons, however, sea ice reformed and caused downwelling of dense, oxygen-rich waters to recharge bottom waters. The combination of lower organic productivity and more oxygen-rich bottom water allowed oxidized sediment to accumulate. Once full interglacial conditions were established, the volume of sea ice produced was insufficient to affect either productivity or the supply of dissolved oxygen and so bottom conditions again became reducing.

Similar events probably occurred during the onset of global glacial conditions, and similar oxidized layers probably formed at these times. Such oxidized zones are highly unstable, however, in a reducing environment and, once buried beyond the influence of bacterial and infaunal activities, are depleted of their available oxygen and converted to reduced sediment.

Type
Research Article
Information
Quaternary Research , Volume 18 , Issue 1 , July 1982 , pp. 91 - 107
Copyright
University of Washington

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