Manganese fluxes from Mississippi Delta sediments |
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| Authors: | John H Trefry Bob J Presley |
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| Institution: | Department of Oceanography and Ocean Engineering, Florida Institute of Technology, Melbourne, FL 32901 USA;Department of Oceanography, Texas A&M University, College Station, Texas 77843 USA |
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| Abstract: | Massive sediment deposition on the Mississippi River Delta establishes reducing conditions sufficient to bring about Mn dissolution in the top millimeters of sediment. As a result, significant fluxes of dissolved Mn pass from the Delta sediments to the overlying water column. This process is examined by study of chemical partitioning of Mn in river particulates and Delta sediments and from interstitial water chemistry. Remobilized Mn is actively transported away from the Delta area with aluminosilicate detritus thereby providing “excess” Mn to the deep Gulf of Mexico at the expense of the Delta sediments. |
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