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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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,

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 1·5 m high, are found in a 10 to 15 m thick interval within the Late Ordovician Eureka Quartzite of Southern Nevada and Eastern

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,

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

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

Sulfur sources of buckshot pyrite in the Auriferous Conglomerates of the Mesoarchean Witwatersrand and Ventersdorp Supergroups, South Africa

23 24 Large rounded pyrite grains (>1 mm), commonly referred to as ‘buckshot’ pyrites, are a characteristic feature of 25 the auriferous conglomerates (reefs) in the Witwatersrand and Ventersdorp



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

Submarine erosion on the anoxic sea floor: stratinomic, palaeoenvironmental, and temporal significance of reworked pyritebone deposits

  • G. BairdC. Brett
  • Environmental Science, Geography
    Geological Society, London, Special Publications
  • 1991
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

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


  • P. Binda
  • Geography, Environmental Science
  • 1991
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

Sedimentary pyrite: A window into the microbial past

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 to

Formation of Holocene sedimentary laminae in the Black Sea and the role of the benthic flocculent layer

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 to

Geochemistry of Sedimentary Ore Deposits

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 of

Preservation of shell microstructure in silicified brachiopods from the Upper Cretaceous Wilmington Sands of Devon

Summary From a study of silicified fossils, and in particular the microstructure of brachiopods, from the Wilmington Sands (Upper Cretaceous) of Devon, a model of skeletal silicification is proposed.

Pyrite ooids in Devonian black shales record intermittent sea-level drop and shallow-water conditions

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 were

Shelf construction in a foreland basin: storm beds, shelf sandbodies, and shelf-slope depositional sequences in the Upper Cretaceous Mesaverde Group, Book Cliffs, Utah

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