Results 211 to 220 of about 5,620 (262)

Oxidation and Heave of Black Shale

Journal of the Soil Mechanics and Foundations Division, 1973
EVIDENCE 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, James E. Zajic, Edward McKyes, Raymond N. Yong   +3 more
openaire   +1 more source

Black Shale as a Sorbent for Trichloroethylene and CR(VI)

Environmental Technology, 2005
Black shale was examined as a natural sorbent for organic and inorganic contaminants. Trichloroethylene (TCE) could be removed well from the water by sorption onto the locally available black shale because of the high organic carbon content (5.2%) of the black shale in this study.
J E, Min, T, Lee, J, Choi, J W, Park
openaire   +2 more sources

Microbes and Black Shales

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 ...
openaire   +1 more source

Molybdenum in black shales and the incidence of bovine hypocuprosis

Journal of the Science of Food and Agriculture, 1972
AbstractStream 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
openaire   +2 more sources

Metals in Black Shales

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.
openaire   +1 more source

Diagenetic alteration in black shales

Journal of the Geological Society, 1980
To 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 ...
openaire   +1 more source

Bioflotation of a Black Shale Copper Ore

Advanced Materials Research, 2007
A sample of black shale fraction of copper ore from the Lubin deposit, Poland, was subjected to pretreatment by different microorganisms to improve the copper recovery during the subsequent flotation. Chemolithotrophic bacteria grown on So and S2O3 2- were used to depress pyrite before flotation by means of ethyl xantate as collector. Sulphate-reducing
Irena Spasova, Marina Nicolova, Stoyan Groudev   +2 more
openaire   +1 more source

Model for transgressive black shales?

Geology, 1991
Many 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.
openaire   +1 more source

Au-Cu Black Shale Formations

Earth Science Frontiers, 2007
Abstract The results of the generalization of lithologic-facial and paleogeographic reconstructions and genetic formational analysis of the various metalliferous high-carbonaceous Phanerozoic sedimentary complexes are presented and systematized. The factors predetermining the origin of ore concentrations of gold and copper are specified.
V.I. STAROSTIN, O.V. YAPASKURT
openaire   +1 more source

Environments of Origin of Black Shales

AAPG Bulletin, 1939
ABSTRACT Explanations of origin are reviewed and environments in which black muds are in process of deposition are considered. The causes of blackness are examined and attention is given to diagenetic processes that take place in black muds.
openaire   +1 more source