آخرین محصولات
Pyrite ooids in Devonian black shales record intermittent sea-level
Pyrite ooids occur above erosion surfaces that are considered sequence boundaries because of large lateral extent. Chamositic precursor ooids indicate an oxygenated water …
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Pyrite ooids in Devonian black shales record intermittent sea …
Pyrite ooids occur above erosion surfaces that are considered sequence boundaries because of large lateral extent. Chamositic precursor ooids indicate an oxygenated …
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Decoding the mechanism of formation in marine ooids: A review
Ooids are spherical or ovoidal carbonate grains (typically <2 mm in diameter) of smooth, well-laminated cortices that accrete around a nucleus, typically a bioclast, peloid, siliciclastic grain or lithoclast (Fig. 1). Larger ooids, with diameters from 2 to 10 mm ("pisoids" or "giant ooids") are also known and mainly documented in the ...
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Pyrite Ooids from the Winnipeg Formation (Ordovician)
A typical stratigraphic section of the Winnipeg Formation with an occurrence of abundant pyrite ooids marked. there are other, less prominent, occurrences lower down in the Black Island member. Typical sandstone with pyrite ooids. The large pyrite grains are approximately 1-1.5 mm in diameter.
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(PDF) Chamosite, siderite and the environmental conditions of …
The latter subtype in which the ooids and the groundmass consist of kaolinite, senso stricto does not belong to ironstones, but is the proto-ore of the ferruginized kaolinite subtype.
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Geochemical and isotopic evidence for paleoredox conditions …
Formation of diagenetic pyrite was carbon limited in these members. The Clegg Creek Member contains 10% to 15% TOC and 2% to 6% sulfide sulfur. ... Pyrite ooids in Devonian black shales record intermittent sea-level drop and shallow-water conditions Geology. Transport and reduction of sulfate and immobilization of sulfide in marine black shales ...
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Devonian Black Shales Eastern US
During sea-level rise the lag deposits were draped by black shales and the chamosite was replaced by pyrite. Pertinent References: Schieber, J., and Riciputi, L., 2004, Pyrite ooids in Devonian Black Shales record …
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Giant ooids in a Neoproterozoic carbonate shelf, Simla Group, …
This study is the first comprehensive documentation of giant ooids and related facies associations in the Kunihar Formation, Proterozoic Simla Group Lesser Himalaya, Himachal Pradesh, analysing the understanding of processes and controls on development of giant ooids.Based on field observations, supplemented by outcrop based facies …
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Chamosite, siderite and the environmental conditions of
Chlorite is the main mineral of the unaltered chamosite-subtype ironstones and forms the groundmass and the ooids. In reflected light, crossed polars and oil immersion lenses, chlorite has green internal reflections. The ooids occur in varying proportions, locally up to 90 vol.% (Fig. 1 A).Generally, chlorite is associated with siderite, subordinately …
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Modern Iron Ooids of Hydrothermal Origin as a Proxy …
Here, we report an exceptional, unique finding of a still active deposit of submillimetric iron ooids, under formation at the seabed at a …
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The significance of iron ooids from the middle Eocene of the
The significance of iron ooids from the middle Eocene of the Transylvanian Basin, Romania. ... a deep-ocean type, associated to low sedimentation rates, sea floor erosion, and vent systems (hydrothermal vents and cold seeps ... hematite goethite chamosite or berthierine siderite and pyrite: very shallow: Bahariya - Egypt (Salama et …
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Amino acids of Proterozoic and Ordovician sulphide
Pyrite-marcasite ooids also occur in a 5-15-cm-thick layer composed al- most entirely of sulphide (sulphidite) with in- terstitial clay and silt. The quartz wackes were deposited in shoreface and shelf environments during the transgression of the Middle Ordo- vician sea into the Williston basin (Vigrass, 1971 ).
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NSF Award Search: Award # 9706178
An official website of the United States government. Here's how you know
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Limestone
Most popular shallow water areas include the Caribbean Sea, Indian Ocean, Persian Gulf, ... Minor constituents include clay, iron carbonate, siderite, sulfate, feldspar, pyrite, and quartz. READ: What is Weathering and Different Types of ... Oolite or egg stone is a sedimentary rock formed from ooids, spherical grains, or shell particles (less ...
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PUBLICATIONS
Schieber, J., 2007, Oxydation of Detrital Pyrite as a Cause for Marcasite Formation in Marine Lag Deposits from the Devonian of the Eastern US. ... Schieber, J., and Riciputi, L., 2004, Pyrite ooids in Devonian Black Shales record intermittent Sea level drop and shallow water conditions. ... J., and Nestell, M.E., 1994, The influence of sea ...
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Post-depositional modification of carbonate ooids by
In the Western Tethys and the European epicontinental sea, ... Therefore, the low δ 34 S associated with red ooids could be consistent with a primary or early diagenetic pyrite phase within the ooids, which was later oxidized to hematite. The CAS fraction for the red ooids could also contain contributions from weathered pyrite, if neomorphism ...
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Microbially Mediated Organomineralization in Paleozoic …
This article reports the first results of studies on microbially mediated organomineralization in carbonate ooids from the Paleozoic sections of the …
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Global oolite deposits across the Permian–Triassic boundary: A
Sediments containing ooids were also very abundant around the world in the strata near the LPE, through the initial stage of partial recovery at the Permian–Triassic boundary (PTB) and continued to be widespread during the Early Triassic (Fig. 1).Therefore, these ooid-rich facies have been regarded as one of the suite of unusual sedimentary …
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–BSE image of a Fe-ooid with a fish tooth in the nucleus. Note: …
A model for the genesis of ellipsoidal ooids with alternating Fe-rich and P 2 O 5 -rich cortices has been proposed for ooids from the French Maritime Alps (Barale et al., 2013). The authors ...
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(PDF) The genetic implications of microbial fossils for microbial
Although, the micrite and microspar are the basic components of the bioherm, growth of the calcified microorganisms, benthic ooids and framboidal pyrite in leiolitic bioherm offers a reference for ...
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On the Origin and Significance of Pyrite Spheres in Devonian …
Pyrite ooids in Devonian black shales record intermittent sea-level drop and shallow-water conditions Geology. Early diagenetic silica deposition in algal cysts and spores; a source of sand in black shales? Journal of Sedimentary Research. From source to sink: Glacially eroded, Late Devonian algal "cysts" ( Tasmanites ) delivered to the ...
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Post-depositional modification of carbonate ooids by
Pyrite Hematitization Organomineralization Lower–Middle Jurassic Southern Tibet 1. Introduction Ooids occur in a wide range of shallow marine and lacustrine …
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Publications on Shale Research
research by Juergen Schieber on shales, microbial fossils, mars, planetary geology, microbe-sediment interactions, Devonian black shale, Chattanooga Shale, Ohio Shale ...
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Ooids: A review
Ooids are spherical or subspherical carbonate grains characterized by an internal concentric structure and average dimensions ranging mainly from 0.25 to 1.00 mm. In Recent, unaltered ooids it is possible to distinguish a variable nucleus (mud aggregate, bioclastic grains, quartz grains, etc.) and an external cortex formed by concentric ...
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Chlorite in sandstones
BSEM images of chlorite coated sandstone, Jurassic Norwegian North Sea samples from ~4400 m TVD ss. (A) Low resolution image showing Fe-ooids, open pores, and minimal quartz cement due to the presence of chlorite grain coats. (B) Higher resolution image of the inner part of detrital chlorite-rich coat with a chaotic structure.
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Microbially Mediated Organomineralization in Paleozoic Carbonate Ooids
Allochthonous formations can also be attributed to ooids from deep-sea deposits, which could get there with flows from shallow areas of the shelf. ... Authigenic octahedral pyrite and iron oxides of framboidal nanopyrite are found in the nuclei and microbial films in the composition of ooid envelopes. According to Folk (2005), the …
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Pyritized ooids from the Arabian Sea Basin
Pyritized ooids in association with turbidites were observed in a box core collected at a depth of 3627 m from the Arabian Sea Basin. Ooids having a shallow …
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(PDF) Amino acids of Proterozoic and Ordovician sulphide …
Amino acids of Proterozoic and Ordovician sulphide-coated grains from western Canada: Record of biologically-mediated pyrite precipitation . × Close Log In. Log in with Facebook Log in with Google. or. Email. Password. Remember me on this computer. or reset password. Enter the email address you signed up with and we'll email you a reset link. ...
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A Case Study on the Co-Occurrence of Oncoids and Ooids in
The co-occurrence of oncoids and ooids is interpreted as follows: (1) in the high-energy oolitic shoals, the environment was suitable for the growth of microorganisms; (2) oncoids and ooids developed in an environment dominated by microbial mats during the relative sea-level decline; (3) after environmental change, the growth of microorganisms ...
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Origin of ooids, peloids and micro-oncoids of marine ironstone …
Pyrite, wurtzite, barite and sulphide nodules (Co, Ni, Fe, Cu)AsS occur locally in ironstones. The diameter of globular iron sulphides and wurtzite varies from 40 …
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