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

@article{Schieber2005PyriteAM,
  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},
  year={2005}
}
A lamp unit for use in photography or video taping having a battery seat which can accommodate batteries of differing configurations. The lamp unit comprises a lamp body and a back plate which defines the battery seat. A plurality of electrical terminals are positioned about the back plate such that when a battery is attached thereto the battery terminals, irrespective of their location on the battery, will be in electrical contact with the terminals on the back plate. 
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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 and… Expand
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
Gold accumulation in the Archaean Witwatersrand Basin, South Africa — evidence from concentrically laminated pyrite
Abstract Concentrically laminated pyrite is a relatively common, although volumetrically minor, component of auriferous conglomerates in the Archaean (ca. 3.0–2.7 Ga) Witwatersrand Basin of South… Expand
Microscopy evidence of bacterial microfossils in phosphorite crusts of the Peruvian shelf: Implications for phosphogenesis mechanisms
Abstract Phosphorites are sedimentary formations enriched in Ca-phosphate minerals. The precipitation of these minerals is thought to be partly mediated by the activity of microorganisms. The vast… Expand
On the origin of a phosphate enriched interval in the Chattanooga Shale (Upper Devonian) of Tennessee—A combined sedimentologic, petrographic, and geochemical study
Abstract The Devonian Chattanooga Shale contains an uppermost black shale interval with dispersed phosphate nodules. This interval extends from Tennessee to correlative strata in Kentucky, Indiana,… Expand
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 Eastern… Expand
Microscopic biomorphic structures in Upper Cretaceous marine sedimentary pyrite
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
The formation of low-temperature sedimentary pyrite and its relationship with biologically-induced processes
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 deposit… Expand
Microbial mat structures in profile: The Neoproterozoic Sonia Sandstone, Rajasthan, India
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 a… Expand
Sulfur sources of sedimentary “buckshot” pyrite in the Auriferous Conglomerates of the Mesoarchean Witwatersrand and Ventersdorp Supergroups, Kaapvaal Craton, South Africa
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 Ventersdorp… Expand
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References

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Diagenetic pyritization in three sedimentary rocks
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, pseudomorphous… Expand
Submarine erosion on the anoxic sea floor: stratinomic, palaeoenvironmental, and temporal significance of reworked pyritebone deposits
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 of… Expand
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 variable… Expand
ANOXIC SULPHIDIC DIAGENESIS IN THE ORDOVICIAN WINNIPEG FORMATION OF SASKATCHEWAN
ABSTRACT Sandstones and shales of the Ordovician Winnipeg Formation from the subsurface of southern Saskatchewan contain remarkable textural and organic chemical evidence of anoxic sulphidic… Expand
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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 of… Expand
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 variation… Expand
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