Results 141 to 150 of about 1,928,014 (200)
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Journal of the Geological Society, 1980
‘Black shales’ is an old term for argillaceous rocks rich in organic matter. The characteristics of the depositional environment of such deposits have long intrigued geologists, particularly the extent to which actualistic models can be applied. The revived interest in the last few years stems principally from the wide-spread recognition that black ...
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‘Black shales’ is an old term for argillaceous rocks rich in organic matter. The characteristics of the depositional environment of such deposits have long intrigued geologists, particularly the extent to which actualistic models can be applied. The revived interest in the last few years stems principally from the wide-spread recognition that black ...
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Paleobiology, 1983
In earlier and simpler times in North American geology, there was an extraordinarily large amount of unexplored ground per available geologist to study it. State and territorial geological surveys, which undertook the first comprehensive mapping programs in the nineteenth century, were at first able to make only the grossest descriptions of outcrops in
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In earlier and simpler times in North American geology, there was an extraordinarily large amount of unexplored ground per available geologist to study it. State and territorial geological surveys, which undertook the first comprehensive mapping programs in the nineteenth century, were at first able to make only the grossest descriptions of outcrops in
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Geophysical characterization of black shales
Proceedings, 2012Black shales are dark, thinly bedded sedimentary rocks deposited under anaerobic conditions. They are rich in carbon, sulfides and organic matter, and potentially can serve as hydrocarbon source rocks. Black shales may also contain significant enrichments of gas or oil (gas shales, oil shales).
Bauer, K. ; https://orcid.org/0000-0002-7777-2653 +7 more
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Elemental profile of black shales
Chinese Journal of Geochemistry, 2011A black shale sample collected from the Chimiari site (Tarbela) was analyzed for elemental contents. Inductively coupled plasma-optical emission spectrometry (ICP-OES) was employed to determine major and trace elements in the digests. Precise analysis was accomplished for the black shales, which was better than 2.0%.
Kashif Naeem +3 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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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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Molybdenum in black shales and the incidence of bovine hypocuprosis
Journal of the Science of Food and Agriculture, 1972AbstractStream sediments were sampled systematically in nine areas totalling 1100 sq. milesThroughout this paper 1 sq. mile = 2.589 km2. underlain in part by marine black shales ranging in age from Ordovician to Cretaceous. Regional patterns of molybdenum in the sediment were related to the underlying bedrock.
I, Thomson, I, Thornton, J S, Webb
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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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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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