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- ARCHEAN OCEAN ANALOG (1)
- Authigenic enrichment (1)
- Authigenic minerals (1)
- BALTIC SEA (1)
- BENTHIC IRON (1)
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- BILLION YEARS AGO (1)
- BLACK-SEA SEDIMENTS (1)
- Diagenesis (1)
- Euxinia (1)
- FERRUGINOUS CONDITIONS (1)
- Iron isotopes (1)
- MARGIN SEDIMENTS (1)
- Mass balance (1)
- OXYGEN MINIMUM ZONE (1)
- Ocean redox (1)
- PYRITE FORMATION (1)
- Paleo-redox (1)
- Reactive iron (1)
- Reducing sediments (1)
- SULFATE REDUCTION (1)
- Shuttle (1)
- Trace metals (1)
Articles 1 - 3 of 3
Full-Text Articles in Earth Sciences
Controls On Trace Metal Authigenic Enrichment In Reducing Sediments: Insights From Modern Oxygen-Deficient Settings, Susan Little, Derek Vance, Timothy Lyons, James Mcmanus
Controls On Trace Metal Authigenic Enrichment In Reducing Sediments: Insights From Modern Oxygen-Deficient Settings, Susan Little, Derek Vance, Timothy Lyons, James Mcmanus
James McManus
Any effort to reconstruct Earth history using variations in authigenic enrichments of redox-sensitive and biogeochemically important trace metals must rest on a fundamental understanding of their modern oceanic and sedimentary geochemistry. Further, unravelling the multiple controls on sedimentary enrichments requires a multi-element approach. Of the range of metals studied, most is known about the behavior of Fe, Mn, and Mo. In this study, we compare the authigenic enrichment patterns of these elements with a group whose behavior is not as well defined (Cd, Cu, Zn, and Ni) in three oxygen-poor settings: the Black Sea, the Cariaco Basin (Venezuela), and the …
The Sedimentary Flux Of Dissolved Rare Earth Elements To The Ocean, April Abbott, Brian Haley, James Mcmanus, Clare Reimers
The Sedimentary Flux Of Dissolved Rare Earth Elements To The Ocean, April Abbott, Brian Haley, James Mcmanus, Clare Reimers
James McManus
We determined pore fluid rare earth element (REE) concentrations in near-surface sediments retrieved from the continental margin off Oregon and California (USA). These sites represent shelf-to-slope settings, which lie above, within, and below the oxygen minimum zone of the Northeast Pacific. The sediments are characterized by varying degrees of net iron reduction, with pore fluids from the shelf sites being generally ferruginous, and the slope sediments having less-pronounced iron reduction zones that originate deeper in the sediment package. REE concentrations show maxima in shallow (upper 2–10 cm) subsurface pore fluids across all sites with concentrations that rise more than two …
On The Isotope Composition Of Reactive Iron In Marine Sediments: Redox Shuttle Versus Early Diagenesis, Florian Shultz, Silke Severman, James Mcmanus, Anna Nofke, Ulrike Lomnitz, Christian Hensen
On The Isotope Composition Of Reactive Iron In Marine Sediments: Redox Shuttle Versus Early Diagenesis, Florian Shultz, Silke Severman, James Mcmanus, Anna Nofke, Ulrike Lomnitz, Christian Hensen
James McManus
The isotope composition of reactive iron (Fe) in marine sediments and sedimentary rocks is a promising tool for identifying Fe sources and sinks across ocean basins. In addition to cross-basinal Fe redistribution, which can modify Fe isotope signatures, Fe minerals also undergo diagenetic redistribution during burial. The isotope fractionation associated with this redistribution does not affect the bulk isotope composition, but complicates the identification of mineral- specific isotope signatures. Here, we present new Fe isotope data for Peru margin sediments and revisit previously published data for sediments from the California margin to unravel the impact of early diagenesis on Fe …