Results 241 to 250 of about 46,126 (273)
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Oxidation and Heave of Black Shale
Journal of the Soil Mechanics and Foundations Division, 1973EVIDENCE IS PRESENTED IN SUPPORT OF THE THEORY THAT AUTOTROPHIC BACTERIA OF THE THIOBACILLUS-FERROBACILLUS FERROOXIDANS SPECIES ARE IMPORTANT IN CATALYZING THE OXIDATION OF SULPHIDES IN BLACK SHALE. GYPSUM IS SUGGESTED AS THE ACTUAL MINERAL SPECIES CAUSING AT LEAST SOME OF THE HEAVE.
Robert M. Quigley +3 more
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Annals of the New York Academy of Sciences, 1961
Studies on uranium-lead dating of black shales on the Upper Devonian Chattanooga shale and the Upper Cambrian Swedish alum shale are presented. From these studies the ages are estimated to be 320 to 350 m.y. for the Chattanooga shale and 500 m.y. for the Swedish alum shale. The principal problems of U-Pb dating and its possibilities are discussed.
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Studies on uranium-lead dating of black shales on the Upper Devonian Chattanooga shale and the Upper Cambrian Swedish alum shale are presented. From these studies the ages are estimated to be 320 to 350 m.y. for the Chattanooga shale and 500 m.y. for the Swedish alum shale. The principal problems of U-Pb dating and its possibilities are discussed.
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Ozonization of Chattanooga Uraniferous Black Shale
Journal of Chemical & Engineering Data, 1961Work on the oxidation of pyrite and organic matter of the shale by moist ozone is described. Information on the organic acids produced was obtained for possible industrial application. Pyrite was ozonized separately to es tablish its behavior uncomplicated by the presence of other constituents in the shale.
C. R. KINNEY, J. T. LEONARD
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2000
Black shales, in general, form under low oxic to anoxic conditions, where microbes have evolved a variety of metabolic pathways. Modern oxygen-depleted environments typically contain anaerobic heterotrophic bacteria, aerobic chemolithoautotrophic bacteria (which partly live in mutualistic relationship with certain metazoa) and anaerobic ...
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Black shales, in general, form under low oxic to anoxic conditions, where microbes have evolved a variety of metabolic pathways. Modern oxygen-depleted environments typically contain anaerobic heterotrophic bacteria, aerobic chemolithoautotrophic bacteria (which partly live in mutualistic relationship with certain metazoa) and anaerobic ...
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Nano-elemental Geochemistry of Black Shales
Proceedings, 2016Black shales (BS) accumulate economic and biologically important trace metals such as Re, precious metals, U, V, Mo, Cu, Ni and Co above expected Clarke concentrations. We extracted colloid-salt fraction with particle size
E. Panova +4 more
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Black shales in Ukraine – A review
Marine and Petroleum Geology, 2012Abstract As a result of a long-lasting and complex geological history, organic-matter-rich fine-grained rocks (black shales) with widely varying ages can be found on Ukrainian territory. Several of them are proven hydrocarbon source rocks and may hold a significant shale gas potential. Thick Silurian black shales accumulated along the western margin
Reinhard F. Sachsenhofer +1 more
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1993
Shales that are rich in organic matter occur throughout the geologic record, but special conditions are responsible for their occurrence (Tourtelot, 1979). Before considering organic matter- and metal-rich shales, some background information is necessary.
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Shales that are rich in organic matter occur throughout the geologic record, but special conditions are responsible for their occurrence (Tourtelot, 1979). Before considering organic matter- and metal-rich shales, some background information is necessary.
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Model for transgressive black shales?
Geology, 1991Many black shales in thick epicontinental basinal successions formed beneath an oxygen-restricted puddle of deep water. Other black shales formed during rapid transgression when basinal deposition expanded to cover basin-margin areas normally characterized by shallow-water deposition.
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Diagenetic alteration in black shales
Journal of the Geological Society, 1980To most field geologists 'black shales' are dark, fissile sedimentary rocks which are rich in both carbon and sulphur. The property of fissility probably develops only in sediments deposited from anoxic bottom waters. Carbon and sulphur-rich sediments are formed wherever relatively organic-rich material accumulates at such a rate that intensive ...
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Black shale heaving at Ottawa, Canada
Canadian Geotechnical Journal, 1970Three inches (7.6 cm) of differential heave has caused severe structural deformation of a lightly loaded building founded directly on drained black shale bedrock in Ottawa, Canada. Portions of the building founded on shale below the water table have not heaved.The heave is attributed to oxidation of disseminated iron sulfide in the shale by ...
R. M. Quigley, R. W. Vogan
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