Results 201 to 210 of about 5,620 (262)
Chemical Geology, 2019 Titanium (Ti) is typically hosted in detrital minerals in marine sediments and has long been considered to be immobile during diagenesis. In this study, the authigenic titania minerals, brookite and anatase, are observed in early Cambrian carbonaceous ...
Mei-Fu Zhou +2 more
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Journal of Earth System Science, 2006 Four organic-rich shale units of the Proterozoic Vindhyan sedimentary succession have been scanned to reveal their origin and hydrocarbon potential. The wavy-crinkly nature of the carbonaceous laminae is suggestive of a microbial mat origin of the shales.
Suryendu Dutta, U Mann
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Are there black shales and black shales?
Bollettino della Società Paleontologica Italiana, 2012-
FERRETTI, Annalisa +2 more
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Depositional processes of black shales in deep water
Marine and Petroleum Geology, 2001 With deep-water exploration for and production of hydrocarbons becoming progressively more extensive and successful, it is clearly important to understand the processes of deposition and organic matter preservation of black shale source rocks in the deep
D A V Stow
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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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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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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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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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