Distribution and chemistry of manganese,iron, and suspended particulates in Orca Basin |
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| Authors: | John H Trefry Bob J Presley Wendy L Keeney-Kennicutt Robert P Trocine |
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| Institution: | (1) Department of Oceanography and Ocean Engineering, Florida Institute of Technology, 32901 Melbourne, FL;(2) Department of Oceanography, Texas A & M University, 77843 College Station, TX |
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| Abstract: | The intense halocline and redoxcline in the Orca Basin, northwest Gulf of Mexico, induce dramatic water column profiles for manganese, iron, and suspended particulates. Within a 17 m interval, the salinity of the basin water increases from 66 to  260 & permil and dissolved oxygen decreases to zero. Midway through this transition zone, concentrations of suspended matter peak at 900  g/liter. Dissolved iron and manganese concentrations in the anoxic brine increase from oceanic values to maxima of 1.6 and 22 mg/liter, respectively. Upward migration of dissolved manganese from the brine leads to production of manganese-rich particles in the slightly oxygenated overlying water. |
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