journal article Aug 16, 2002

Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?

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Abstract
Recent data imply that for much of the Proterozoic Eon (2500 to 543 million years ago), Earth's oceans were moderately oxic at the surface and sulfidic at depth. Under these conditions, biologically important trace metals would have been scarce in most marine environments, potentially restricting the nitrogen cycle, affecting primary productivity, and limiting the ecological distribution of eukaryotic algae. Oceanic redox conditions and their bioinorganic consequences may thus help to explain observed patterns of Proterozoic evolution.
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References
150
[3]
Geochemical evidence of a hydrothermal source for Fe in BIFs is presented in (123 124).
[4]
Holland H. D., Beukes N. J., Am. J. Sci. 290A, 1 (1990). 10.2475/ajs.290.1.1
[9]
The Archean Proterozoic and Phanerozoic Eons span the intervals 3800 to 2500 Ma 2500 to 543 Ma and 543 to 0 Ma respectively. The Paleoproterozoic Mesoproterozoic and Neoproterozoic Eras span the intervals 2500 to 1600 Ma 1600 to 1000 Ma and 1000 to 543 Ma respectively. Here “mid-Proterozoic” refers to the interval 1800 to 1250 Ma.
[15]
A. H. Knoll in Origin and Early Evolution of the Metazoa J. H. Lipps P. W. Signor Eds. (Plenum New York 1992) pp. 53–84. 10.1007/978-1-4899-2427-8_3
[16]
Anoxic conditions amenable to BSR occurred at least locally and sporadically since the Archean as they do today in the waters of restricted ocean basins and in marine sediments.
[17]
For a review of relevant S isotope systematics see (125).
[18]
Mass-dependent S isotope fractionation is commonly expressed as δ 34 S = ‰ deviation in 34 S/ 32 S from the Canyon Diablo Troilite (CDT) standard = [( 34 S/ 32 S) sample /( 34 S/ 32 S) CDT – 1] × 1000.
[21]
δ 34 S depletion of H 2 S relative to SO 4 2– in Black Sea waters is >45‰ [(19) and references therein] hence 34 S depletion by S 0 disproportionation does not require a completely oxic water column. However in redox-stratified oceans with low-H 2 S surface waters anoxygenic photosynthesis which produces little S isotope fractionation while converting H 2 S to SO 4 2– may dominate S cycling in the photic zone. Therefore S isotope fractionation of >45‰ suggests O 2 penetration at least below the photic zone [see (12) and references therein].
[22]
Precambrian S isotope data and interpretations are reviewed by Canfield and colleagues in (8) and (125); see also (126 127).
[24]
A different interpretation is given in (128 129). But see also a rebuttal in (130).
[25]
The extent of S isotope fractionation by biochemical effects may be restricted by reservoir effects whereby preferential loss of 32 S from the SO 4 2– reservoir progressively enriches the reservoir in 34 S. H 2 S subsequently produced is enriched in 34 S compared to the maximum depletion possible when SO 4 2– is abundant.
[31]
T. W. Lyons J. P. Werne D. J. Hollander R. W. Murray Chem. Geol. in press.
[36]
M. T. Hurtgen M. A. Arthur N. S. Suits A. J. Kaufman Earth Planet. Sci. Lett. in press.
[37]
Mass-dependent C isotope fractionation is commonly expressed as δ 13 C = ‰ deviation in 13 C/ 12 C from the Pee Dee Belemnite (PDB) standard = [( 13 C/ 12 C) sample /( 13 C/ 12 C) PDB – 1] × 1000.
[39]
R. M. Ganels F. T. MacKenzie Evolution of Sedimentary Rocks (Norton New York 1971) pp. 119–131.
[42]
A. Bekker et al. Am. J. Sci. 301 261 (2001). 10.2475/ajs.301.3.261
[47]
J. K. Bartley et al. Precambrian Res. 111 165 (2001). 10.1016/s0301-9268(01)00160-7

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Metrics
973
Citations
150
References
Details
Published
Aug 16, 2002
Vol/Issue
297(5584)
Pages
1137-1142
Cite This Article
A. D. Anbar, A. H. Knoll (2002). Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?. Science, 297(5584), 1137-1142. https://doi.org/10.1126/science.1069651
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