Cited by 1,194Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisMarine Plankton and Biogeochemistry

The DOI matches its Crossref record; 125 of the 125 references it cites were found in a registry or an index.

Mo–total organic carbon covariation in modern anoxic marine environments: Implications for analysis of paleoredox and paleohydrographic conditions

Algeo, Thomas J., Lyons, Timothy W.·2006·Paleoceanography

Abstract

Sedimentary molybdenum, [Mo] s , has been widely used as a proxy for benthic redox potential owing to its generally strong enrichment in organic‐rich marine facies deposited under oxygen‐depleted conditions. A detailed analysis of [Mo] s –total organic carbon (TOC) covariation in modern anoxic marine environments and its relationship to ambient water chemistry suggests that (1) [Mo] s , while useful in distinguishing oxic from anoxic facies, is not related in a simple manner to dissolved sulfide concentrations within euxinic environments and (2) patterns of [Mo] s ‐TOC covariation can provide information about paleohydrographic conditions, especially the degree of restriction of the subchemoclinal water mass and temporal changes thereof related to deepwater renewal. These inferences are based on data from four anoxic silled basins (the Black Sea, Framvaren Fjord, Cariaco Basin, and Saanich Inlet) and one upwelling zone (the Namibian Shelf), representing a spectrum of aqueous chemical conditions related to water mass restriction. In the silled‐basin environments, increasing restriction is correlated with a systematic decrease in [Mo] s /TOC ratios, from ∼45 ± 5 for Saanich Inlet to ∼4.5 ± 1 for the Black Sea. This variation reflects control of [Mo] s by [Mo] aq , which becomes depleted in stagnant basins through removal to the sediment without adequate resupply by deepwater renewal (the “basin reservoir effect”). The temporal dynamics of this process are revealed by high‐resolution chemostratigraphic data from Framvaren Fjord and Cariaco Basin sediment cores, which exhibit long‐term trends toward lower [Mo] s /TOC ratios following development of water column stratification and deepwater anoxia. Mo burial fluxes peak in weakly sulfidic environments such as Saanich Inlet (owing to a combination of greater [Mo] aq availability and enhanced Mo transport to the sediment‐water interface via Fe‐Mn redox cycling) and are lower in strongly sulfidic environments such as the Black Sea and Framvaren Fjord. These observations demonstrate that, at timescales associated with deepwater renewal in anoxic silled basins, decreased sedimentary Mo concentrations and burial fluxes are associated with lower benthic redox potentials (i.e., more sulfidic conditions). These conclusions apply only to anoxic marine environments exhibiting some degree of water mass restriction (e.g., silled basins) and are not valid for low‐oxygen facies in open marine settings such as continent‐margin upwelling systems.

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Crossref · 10.1029/2004pa001112

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Research works printed but not linked: 12

  1. Brewer P. G., 1974, The Black Sea—Geology, Chemistry, and Biology, 137
  2. Friedrich H. J., 1989, Small‐Scale Turbulence and Mixing in the Ocean, 151
  3. Gunnerson C. G., 1974, The Black Sea—Geology, Chemistry, and Biology, 99
  4. Hirst D. M., 1974, The Black Sea—Geology, Chemistry, and Biology, 430
  5. Jacobs L. A.(1984) Metal geochemistry in anoxic marine basins Ph.D. dissertation 217 pp. Univ. of Wash. Seattle.
  6. Lyons T. W.(1992) Comparative study of Holocene Black Sea sediments from oxic and anoxic sites of deposition: Geochemical and sedimentological criteria Ph.D. dissertation 377 pp. Yale Univ. New Haven Conn.
  7. Östlund H. G., 1974, The Black Sea—Geology, Chemistry, and Biology, 127
  8. Östlund H. G., 1986, The Chemical and Physical Oceanography of the Black Sea
  9. Robl T. L., 1987, Devonian of the World, vol. 2, Sedimentation, 377
  10. Shimkus K. M., 1974, The Black Sea—Geology, Chemistry, and Biology, 249
  11. Volkov I. I., 1974, The Black Sea—Geology, Chemistry, and Biology, 456
  12. Wignall P. B., 1994, Black Shales

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Metadata

Authors
Algeo, T. J., & Lyons, T. W.
Affiliations
  • University of Cincinnati (US)
  • University of California, Riverside (US)
Venue
Paleoceanography
Published
2006-03
Volume
21
Issue
1
ISSN
  • 0883-8305 (ISSN-L)
  • 1944-9186
OpenAlex
W1648236804
Cited by
1,194
References
125
Citations by year
2026: 93 · 2025: 102 · 2024: 96 · 2023: 102 · 2022: 94 · 2021: 114 · 2020: 96 · 2019: 68 · 2018: 55 · 2017: 71 · 2016: 59 · 2015: 44 · 2014: 31 · 2013: 42 · 2012: 26
FWCI
14.74
Type
journal article
Language
en
Open access
closed
Locations
Paleoceanography (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Plankton and Biogeochemistry
Keywords
total organic carbon, anoxic marine environment, euxinia, dissolved sulfide, paleohydrography, chemostratigraphy, Black Sea, Cariaco Basin, Saanich Inlet, Namibian shelf, upwelling zones

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