Mn, Fe, Zn and As speciation in a fast-growing ferromanganese marine nodule

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The speciation of Mn, Fe, As and Zn in a fast-growing (0.02mm/yr), shallow-marine ferromanganese nodule has been examined by micro X-ray fluorescence, micro X-ray diffraction, and micro X-ray absorption spectroscopy. This nodule exhibits alternating Fe-rich and Mn-rich layers reflecting redox variations in water chemistry. Fe occurs as two-line ferrihydrite. The As is strictly associated with Fe and is mostly pentavalent, with an environment similar to that of As sorbed on or coprecipitated with synthetic ferrihydrite. The Mn is in the form of turbostratic birnessite with {approx} 10 percent trivalent manganese in the layers and probably {approx} 8 percent corner-sharing metal ... continued below

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Marcus, Matthew A.; Manceau, Alain & Kersten, Michael April 1, 2004.

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The speciation of Mn, Fe, As and Zn in a fast-growing (0.02mm/yr), shallow-marine ferromanganese nodule has been examined by micro X-ray fluorescence, micro X-ray diffraction, and micro X-ray absorption spectroscopy. This nodule exhibits alternating Fe-rich and Mn-rich layers reflecting redox variations in water chemistry. Fe occurs as two-line ferrihydrite. The As is strictly associated with Fe and is mostly pentavalent, with an environment similar to that of As sorbed on or coprecipitated with synthetic ferrihydrite. The Mn is in the form of turbostratic birnessite with {approx} 10 percent trivalent manganese in the layers and probably {approx} 8 percent corner-sharing metal octahedra in the interlayers. The Zn is enriched on the rim of the nodule, associated with Mn. The Zn is completely (>90 percent) tetrahedrally coordinated and sorbed in the interlayers of birnessite on vacant layer Mn sites. The Zn and Mn species are similar to ones found in soils, suggesting common structural principles, despite the differing formation conditions in these systems.

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OSTI as DE00835160

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  • Journal Name: Geochimica et Cosmochimica Acta; Journal Volume: 68; Journal Issue: 14; Other Information: Submitted to Geochimica et Cosmochimica Acta, Volume 68, No.14; Journal Publication Date: 07/2004

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  • Report No.: LBNL--55067
  • Grant Number: AC03-76SF00098
  • DOI: 10.1016/j.gca.2004.01.015 | External Link
  • Office of Scientific & Technical Information Report Number: 835160
  • Archival Resource Key: ark:/67531/metadc781367

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  • April 1, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Sept. 21, 2017, 6:04 p.m.

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Marcus, Matthew A.; Manceau, Alain & Kersten, Michael. Mn, Fe, Zn and As speciation in a fast-growing ferromanganese marine nodule, article, April 1, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc781367/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.