Title: Modern iron isotope perspective on the benthic iron shuttle and the redox evolution of ancient oceans
Abstract: Research Article| June 01, 2008 Modern iron isotope perspective on the benthic iron shuttle and the redox evolution of ancient oceans Silke Severmann; Silke Severmann 1Department of Earth Sciences, University of California–Riverside, Riverside, California 92521, USA Search for other works by this author on: GSW Google Scholar Timothy W. Lyons; Timothy W. Lyons 1Department of Earth Sciences, University of California–Riverside, Riverside, California 92521, USA Search for other works by this author on: GSW Google Scholar Ariel Anbar; Ariel Anbar 2School of Earth and Space Exploration, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, USA Search for other works by this author on: GSW Google Scholar James McManus; James McManus 3College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Gwyneth Gordon Gwyneth Gordon 4School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287, USA Search for other works by this author on: GSW Google Scholar Geology (2008) 36 (6): 487–490. https://doi.org/10.1130/G24670A.1 Article history received: 04 Dec 2007 rev-recd: 29 Feb 2008 accepted: 03 Mar 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Silke Severmann, Timothy W. Lyons, Ariel Anbar, James McManus, Gwyneth Gordon; Modern iron isotope perspective on the benthic iron shuttle and the redox evolution of ancient oceans. Geology 2008;; 36 (6): 487–490. doi: https://doi.org/10.1130/G24670A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The increase in atmospheric oxygen ca. 2.4 Ga had a significant impact on the geochemical cycling of Fe. The history of environmental oxygenation may be recorded in the Fe isotope composition of Archean and Proterozoic sediments, but this record cannot be interpreted accurately until we understand the mechanisms causing isotope variations. Here we present Fe isotope data and iron/aluminum ratios from the Black Sea oxic shelf and euxinic basin. The isotope data demonstrate that shelf Fe is depleted in the lighter isotope compared to both the detrital weathering input and the sediments of the euxinic basin. We propose that there is net transport of isotopically light Fe from sediments of the shelf to those of the distal, anoxic basin, consistent with enrichments in reactive Fe seen in the deep basin. The low δ56Fe benthic Fe flux is generated during the coupling of microbial Fe(III) reduction or sulfidization with Fe2+aq oxidation. Low δ56Fe values reported previously from Late Archean sedimentary pyrites may be an isotopic fingerprint of analogous Fe redox cycling in the Late Archean oceans. This interpretation implies shallow-water Fe redox recycling in the Late Archean. We predict that the light isotopic compositions of the Late Archean will prove to be distinct from those of the Early Archean, before Fe redox cycling became an important process, and we infer that this difference may be related to the presence of oxygen in the surface ocean. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 220
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