Pyrite and Marcasite Coated Grains in the Ordovician Winnipeg Formation, Canada: An Intertwined Record of Surface Conditions, Stratigraphic Condensation, Geochemical

  title={Pyrite and Marcasite Coated Grains in the Ordovician Winnipeg Formation, Canada: An Intertwined Record of Surface Conditions, Stratigraphic Condensation, Geochemical},
  author={J{\"u}rgen Schieber and Lee R. Riciputi},
  journal={Journal of Sedimentary Research},
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Oxidation of detrital pyrite as a cause for Marcasite Formation in marine lag deposits from the Devonian of the eastern US
Late Devonian black shale successions in the eastern US contain numerous discontinuities that are characterized by lags containing variable amounts of quartz sand mixed with reworked pyritic andExpand
Marcasite in Black Shales—a Mineral Proxy for Oxygenated Bottom Waters and Intermittent Oxidation of Carbonaceous Muds
Abstract Black shales in the geologic record have long been considered to reflect deposition under anoxic or even euxinic conditions. Although bottom-water anoxia favors deposition of black shales,Expand
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Microscopy evidence of bacterial microfossils in phosphorite crusts of the Peruvian shelf: Implications for phosphogenesis mechanisms
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Stromatolites in the Late Ordovician Eureka Quartzite: implications for microbial growth and preservation in siliciclastic settings
Well-preserved siliciclastic domal stromatolites, up to 2 m wide and 1AE 5m high, are found in a 10 to 15 m thick interval within the Late Ordovician Eureka Quartzite of Southern Nevada and EasternExpand
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The purpose of this work is to provide a description of biomorphic structures found in sedimentary pyrite present in the organic-rich marine limestone of the Agua Nueva Formation (Upper Cenomanian,Expand
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This contribution is an updated review on sedimentary pyrite and on its role in well-consolidated research topics, such as the biogeochemical cycles and the studies on sediment-hosted ore depositExpand
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Abstract Ubiquitous microorganisms, especially cyanobacteria preferably grow on the sediment surface thereby producing microbial mats. In the absence of grazers and bioturbators, microbial mat is aExpand
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Large rounded pyrite grains (>1 mm), commonly referred to as “buckshot” pyrite grains, are a characteristic feature of the auriferous conglomerates (reefs) in the Witwatersrand and VentersdorpExpand


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The Leicester marcasite bed (Devonian), N.Y., the Clinton ironstone (Silurian), N.Y., and Wabana pyrite beds (Ordovician), Newfoundland, show varying degrees of early diagenetic, pseudomorphousExpand
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Abstract Numerous black (organic-rich) shale units in the Palaeozoic of North America are marked by discontinuities along their bases which are characterized by acid-insoluble lag concentrations ofExpand
The Role of an Organic Slime Matrix in the Formation of Pyritized Burrow Trails and Pyrite Concretions
Abstract Sandstones from the Black Island member of the Winnipeg Formation (Ordovician) contain a variety of early diagenetic iron sulfide morphologies, including elongate concretions of variableExpand
ABSTRACT Sandstones and shales of the Ordovician Winnipeg Formation from the subsurface of southern Saskatchewan contain remarkable textural and organic chemical evidence of anoxic sulphidicExpand
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Early diagenetic pyrite forms as a result of microbial processes in sediments, but has received little attention as a potential source of microbial fossils. Sedimentary pyrite grains, Archean toExpand
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Holocene Black Sea sediments recovered in 1988 and 1993 from box cores and gravity cores were analyzed geochemically, microscopically, and with backscattered electron imagery (BSEI) in order toExpand
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A text providing a sedimentological treatment of a study on ore deposits, and especially as related to geochemistry. Excellently documented (about 5000 citations). Well indexed with the index ofExpand
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Upper Devonian black shales of the eastern United States contain in places unusual beds of pyrite ooids. Textural and geochemical studies show that these originated as chamositic iron ooids that wereExpand
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The Upper Cretaceous (Campanian) Kenilworth Member of the Blackhawk Formation (Mesaverde Group) is part of a series of strand plain sandstones that intertongue with and overstep the shelfal shales ofExpand
Migration of iron and sulfur within anaerobic sediments during early diagenesis
Three diagenetic models based on layered situations are presented to illustrate factors affecting migration of iron and sulfur in recent anaerobic sediments. Two important factors are sharp variationExpand