Journal ArticleDOI
Geochemistry of Recent oxic and anoxic marine sediments: Implications for the geological record
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In this article, the authors examined the distribution of minor and trace elements in marine sediments and provided forensic tools for determining the redox conditions of the bottom waters at the time of deposition.About:
This article is published in Marine Geology.The article was published on 1993-07-01. It has received 1391 citations till now. The article focuses on the topics: Anoxic waters & Sapropel.read more
Citations
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Trace metals as paleoredox and paleoproductivity proxies: An update
TL;DR: In this paper, a synthesis of the use of selected trace elements as proxies for reconstruction of paleoproductivity and paleoredox conditions is presented, and the combined used of U, V and Mo enrichments may allow suboxic environments to be distinguished from anoxic-euxinic ones.
Journal ArticleDOI
Trace-element behavior and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems
Thomas J. Algeo,J. Barry Maynard +1 more
TL;DR: In this paper, the authors developed a multiproxy technique for assessing redox facies in black shale samples: euxinic conditions were considered to have existed if at least two of four trace-indicator trace elements (Mo, U, V, Zn, and Pb), and nonsulfidic anoxic conditions were inferred otherwise.
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The geochemistry of redox sensitive trace metals in sediments
TL;DR: In this paper, the authors analyzed the redox sensitive elements V, Mo, U, Re and Cd in surface sediments from the Northwest African margin, the U.S. Northwest margin and the Arabian Sea to determine their response under a range of redox conditions.
Journal ArticleDOI
Environmental analysis of paleoceanographic systems based on molybdenum–uranium covariation
TL;DR: In this article, an analysis of anoxic facies from two North American paleomarine systems, the Late Pennsylvanian Midcontinent Sea (LPMS) and the Late Devonian Seaway (LDS), reveals authigenic Mo-U relationships similar to those of the modern marine environments above, implying similar redox and hydrographic controls.
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The trace metal content of recent organic carbon-rich sediments; implications for Cretaceous black shale formation
TL;DR: In this article, the authors compared the upwelling and anoxic environments of the C/T black shales and sapropels and concluded that the major driving force for the widespread occurrence of these shales seems to be the increase in volcanic activity and associated CO2-input throughout the Cretaceous.
References
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Journal ArticleDOI
Sequential extraction procedure for the speciation of particulate trace metals
TL;DR: In this paper, an analytical procedure involving sequential chemicai extractions was developed for the partitioning of particulate trace metals (Cd, Co, Cu, Ni, Pb, Zn, Fe, and Mn) into five fractions: exchangeable, bound to carbonates, binding to Fe-Mn oxides and bound to organic matter.
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Early oxidation of organic matter in pelagic sediments of the eastern equatorial Atlantic: suboxic diagenesis
Philip N. Froelich,Gary P. Klinkhammer,Michael L. Bender,Nile A. Luedtke,G.R. Heath,Doug Cullen,Paul Dauphin,Doug Hammond,Blayne Hartman,Val Maynard +9 more
TL;DR: Pore water profiles of total CO 2, pH, PO 3−4, NO − 3 plus NO − 2, SO 2− 4, S 2−, Fe 2+ and Mn 2+ have been obtained in cores from pelagic sediments of the eastern equatorial Atlantic under waters of moderate to high productivity as mentioned in this paper.
Journal ArticleDOI
Sedimentary pyrite formation: An update
TL;DR: In this article, it was shown that organic matter appears to be the major control on pyrite formation in normal (non-euxinic) terrigenous marine sediments where dissolved sulfate and iron minerals are abundant.
Journal ArticleDOI
Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposits
TL;DR: The Gibbs free energies, enthalpies and entropies of 42 dissolved uranium species and 30 uranium-bearing solid phases have been critically evaluated from the literature and estimated when necessary for 25°C.
Journal Article
Cretaceous oceanic anoxic events: causes and consequences
TL;DR: In this article, an interpretation of these events as the result of the interplay of two major geologic and climatic factors is given, namely, the Late Cretaceous transgression which increased the area and volume of shallow epicontinental and marginal seas and was accompanied by an increase in the production of organic carbon; and the existence of an equable global climate which reduced the supply of cold oxygenated bottom water to the world ocean.
Related Papers (5)
Trace-element behavior and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems
Thomas J. Algeo,J. Barry Maynard +1 more