Black shales
Highly metalliferous black shales (HMBS) are enriched in organic carbon and a suite of metals, including Ni, Se, Mo, Ag, Au, Zn, Cu, Pb, V, As, Sb, Se, P, Cr, and U ± PGE, compared to common ...Jan 25, 2019 ... Black shale in the Pennsylvanian of Kentucky, USA. Stratigraphy: lower tongue of the Breathitt Formation, Middle Pennsylvanian Locality: ...
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The lacustrine black shales in the Chang7 Member from the Upper Triassic Yanchang Formation of the Ordos Basin in Central China are considered one of the most important hydrocarbon source rocks. However, the mechanism of organic accumulation in the black shales remains controversial. To resolve the controversy, with the former paleontological data of Yanchang Formation and sedimentation rate ...Jun 5, 2022 · The black shale in the Lower Cambrian Niutitang Formation in Southwest China is anomalously enriched in sedimentary exhalative Ni- and Mo-sulfides. The occurrence of large fluctuation of ocean redox conditions and thriving of benthic animals highlight the uniqueness of the stratum and its link to the Cambrian Explosion. Black shales of Devonian age in the Appalachian Basin are a unique rock sequence. The high content of organic matter, which imparts the characteristic lithology, has for years attracted considerable interest in the shales as a possible source of energy. The recent energy shortage prompted the U.S. Department of Energy through the Eastern Gas Shales Project of the Morgantown Energy Technology Cente
Within the densest black shale are microscopic layers, commonly less than 0.1 mm thick, composed of quartz grains ranging from 0.02 to 0.06 mm and averaging about 0.03 mm in greatest diameter. Still finer quartz ranging in diameter from about 0.004 to 0.012 mm and averaging 0.008 mm is disseminated fairly uniformly throughout the massive shale. . .1. Introduction. The deposition of black shales and the accumulation of organic matter in black shales not only involves the basic biogeochemical processes on Earth, including photosynthesis, oxidation, bacterial sulfate reduction and humification, etc., but also makes an important contribution to the primary source of hydrocarbons and other economic mineral deposits (Arthur and Sageman, 1994 ...Shale forms from the pressure of layers of sediment compressing bits of silt that settle into the clay on the bottom of bodies of water. The compressed clay and silt become shale over time. Shale is a sedimentary rock.At Dotternhausen (Fig. 5), oil shales near the base of Member II (e.g., the Koblenzer, Hainzen, and Fleins) have greater values of ε 205 Tl than the black shales (i.e., the Tafelfleins and Seegrasschiefer) of Member I, which suggests the global expansion of oxygen-minimum zones and anoxic water masses in the marine realm (Them et al., 2018).Black shale, variety of shale that contains abundant organic matter, pyrite, and sometimes carbonate nodules or layers and, in some locations, concentrations of copper, nickel, uranium, and vanadium. Fossils are rare in the shale and either are replaced by pyrite or are preserved as a film of g.
A possible, but untested, sequestration strategy is to inject CO{sub 2} into organic-rich shales. Devonian black shales underlie approximately two-thirds of Kentucky and are thicker and deeper in the Illinois and Appalachian Basin portions of Kentucky than in central Kentucky. The Devonian black shales serve as both the source and trap for ...Weathering of metalliferous black shales has been reported as one of the most potential sources of elevated levels of trace elements in terrestrial and aquatic environments (e.g., Chon et al. 1996; Peng et al. 2004; Lavergren et al. 2009a).This is mainly due to the fact that black shale contains high contents of metal sulfides and organic matter, which are susceptible to weathering when ...…
Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Black shale is a dark-colored mudrock containing o. Possible cause: This interval has the following features: (1) High TOC a...
Black shales are dark-colored, usually thinly laminated mudstones containing appreciable organic matter (>0.5 wt% C), authigenic iron sulfides and, silt- and clay-sized detrital particles that in most cases have been accumulated under anoxic bottom water and/or bottom sediment conditions in marine or continental sedimentary basins (Huyck, 1990 ... Each of the processes summarized above is capable of depositing organic-rich sediments or otherwise influencing black shale sedimentation. They may operate singly or together (Fig. 1).Process interaction can occur sequentially by means of flow transformation, as in a slide becoming a slump, then a debris flow, a high- to low-concentration turbidity current and finally, a hemiturbiditic plume.T he black shales of the Xiaowa Formation, Guanling area, Guizhou Province, south-west China, are a unique Late Triassic (Carnian) Lagerstätte (Wang X. et al., 2000b, 2002a, b, 2003a, b).Nowhere else are so many marine reptile skeletons and pelagic crinoids known in such perfect preservation from this time. Comparable preservation and abundance is known only from the Anisian/Ladinian (Middle ...
Thermal maturity of black shales as indicated by R o is an important parameter in reconstructing the thermal history of sedimentary basins and in the exploration for hydrocarbon resources. In this study, the R o of black shales is 0.04–0.11% (average 0.07%) higher than that of enclosed coals .Virtually, no black shales were deposited during the Cenozoic (Figure 1), with the important exception of the Plio-Pleistocene sapropels of the Mediterranean Sea, which are considered to be near-modern analogs of the ancient black shales [e.g., Erbacher et al., 2001; Meyers, 2006; Negri et al., 2006; Emeis and Weissert, 2009]. The widespread ...The black-shale intervals lack bioturbation and feature mm-thick sub-layers of varying dark-grey and sometimes grey-green colour (in web version). Occasionally, small 1–2 cm thick limestone layers are intercalated (e.g., in couplet 2). The prominent black-shale intervals in couplets 7 and 9 lack limy sub-layers.
zillow deming new mexico The black shale profile (PA and PB) were taken from the Shuishi Formation, which is mainly composed of gray to red sandstone-siltstone interbedded with argillaceous siltstone, sandy shale, black shale, and black shale-weathered products (Fig. 2). To avoid possible contamination of trace metal from falling materials from the upper horizons ... diversity and inclusion masters degreejournalism jobs for highschool students The Alum Shale Formation is a metal-rich black shale, deposited on the Baltoscandian platform between Middle Cambrian and Early Ordovician. These black shales may be of particular economic interest for their relatively high uranium content (100-300 ppm) and their wide distribution from Norway to Estonia.Scandinavian Alum Shale may thus constitute a great potential resource of uranium, as a ... data warehouse presentation Banded iron formations (BIF) are predominantly Precambrian sedimentary rocks composed of alternating layers of iron-rich minerals (commonly hematite and magnetite, but also siderite, chlorite, and grunerite) and silica-rich minerals (e.g., quartz or chert) in which the Fe content of the entire rock is at least 15 wt. %. Although typically thought of as strictly Fe resources, such as in the ... cvs 126th and grayunique auto body american fork reviewspositively reinforced Metallic minerals in black shale. In order to analyze the types of metallic minerals present in the lower Cambrian black shale, minerals from samples in the Xa1 and Xb1 wells have been preliminarily identified. The main sulfur-bearing mineral is pyrite that forms clumps and bands (Fig. 3).A ∼20 m thick unit of dolomitic, pyritic, and finely laminated organic-rich shale (total organic carbon [TOC] up to 6%; Donnelly and Jackson, 1988) occurs within the upper part of the lower Wollogorang Formation.Disseminated pyrite within the black shale is typically fine-grained and euhedral (i.e., syn-depositional pyrite formation within a euxinic … it is time gif The paleodepositional environments related to Ediacaran black shales from the Série Negra succession in Ossa-Morena tectonostratigraphic zone were investigated using their geochemical composition to identify the sedimentary sources and depositional conditions. Their potential for assisting the genesis of metal deposits was also discussed. The sedimentary sources of the black shales are ...Several outcrops of black shales from the Triassic turbidite sequences of the Semanggol and Semantan formations have been described and logged (Table 1 & Fig. 3). Black shales in the Semanggol Formation occur as thin-to medium-bedded, finely-laminated dark grey to grey shales up to 15 m thick (Fig. 4 A-D). On the other hand, black shales of ... training volunteersbasketball millspresbyterian manor arkansas city ks The term Black shale refers to organic-rich fine-grained sedimentary rocks of high economic importance for either conventional or unconventional systems. Due to the increased demand for fossil fuels and the coeval decline in conventional reserves, black shales become more important as a potential future energy resource.The formation of black shale-hosted vanadium deposits is controlled by several factors including metal supply, biological processes, and marine sedimentary environments. Vanadium-bearing minerals have a complex mineralogy in black shale-hosted vanadium deposits, and the implications for the mineralization processes are still poorly understood.