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Browsing ELibrary by Title
Now showing items 2973-2992 of 21821
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(2001)In the Devonian series of northeastern Asia all standard stage boundaries are recognised using conodont indexes, as well as guides as guides of other fossil groups. Other potential correlation means include event boundaries ...
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(2004)Devonian deep-water deposits of the Southern Urals are represented mainly by flysch and cherty units. The main sedimentary basins (marginal sea and back-arc basin) and their origin, evolution and principal depositional ...
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(2004)The Early Paleozoic regression resulted in emergence of the Angaraland. Devonian deposits accumulated in various sedimentary basins, e.g., in gulfs far incised into the Angaraland, as well as in lagoons and lakes. In ...
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(2001)The Devonian stratigraphical succession of Novaya Zemlya has been discussed. In the area all standard boundaries have been recognised or traced using lithological (sedimentological) features and palaeontological data. The ...
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(2001)In this paper the position of the Devonian stage boundaries in the southern Transcaucasus is discussed, in accordance with the new standard conodont scale recommended by the SDS (Ziegler and Sandberg 1990).
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(2001)In the Urals the Devonian is represented by shelf and continental slope facies, as well as various volcanogenic rocks. Palaeontological data, including conodonts and brachiopods, are of use in regional correlation, although ...
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(2001)The Devonian of the East European Platform is chiefly represented by shallow-marine rocks of Lochkovian through Famennian age. Palaeontological evidence from various groups, including condonts, palynomorphs, ostracodes, ...
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(1997)In the Mongolian Altai, thick and widespread Devonian deposits were initially divided into two large stratigraphic complexes; the lower subdivision spanned the Eifelian Stage, and the upper one corresponded to the summary ...
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(2004)In the western fold-and-thrust belt of the southern Urals, the Kbler and rkai indices determined on shales, slates and phyllites record an increase from lower late diagenetic to epizonal grade from west to east. The ...
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(2004)Intra-tooth δ18O variations within the carbonate (δ18Oc) and phosphate (δ18Op) components of tooth apatite were measured for Miocene and Pliocene hypsodont mammals from Afghanistan, Greece and Chad in order to evaluate the ...
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(2004)The stable carbon isotope compositions of individual n-alkanes extracted from leaves of (1) Ginkgo biloba degrading in a well-drained soil and (2) Eretmophyllum, a fossil Ginkgoale, were investigated in a first approach ...
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(2005)This research tests the hypothesis that trace metals respond to the extent of reducing conditions in a predictable way. We describe pore water and sediment measurements of iron (Fe), manganese (Mn), vanadium (V), uranium ...
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(2005)Geochemical and rock magnetic investigations of sediments from three sites on the continental margin off Argentina and Uruguay were carried out to study diagenetic alteration of iron minerals driven by anaerobic oxidation ...
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DIAGENETIC AND CATAGENETIC PRODUCTS OF ISORENIERATENE: MOLECULAR INDICATORS FOR PHOTIC ZONE ANOXIA (1996)A wide range of novel diagenetic and catagenetic products of the diaromatic carotenoid isorenieratene, a pigment of the photosynthetic green sulphur bacteria Chlorobiaceae, has been identified in a number of sedimentary ...
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(2001)Seawater rare-earth element (REE) distributions show heavy REE enrichment and cerium depletion but these characteristics are only rarely found in ancient, marine authigenic minerals such as carbonate fluorapatite and ...
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(2000)The MudMaster computer program, based on the modified Bertaut-Warren-Averbach (BWA) XRD method, was used in the study of diagenetic evolution of illitic material in shales. The illitic material was characterized by XRD as ...
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(2002)The occurrence of quartz-pebble conglomerates (QPC) in the rock record increases backward through time from the Tertiary through the Precambrian. The positive correlation between QPC abundance and age is valid both for ...
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DIAGENETIC PYRITISATION UNDER EASTERN MEDITERRANEAN SAPROPELS CAUSED BY DOWNWARD SULPHIDE DIFFUSION (1996)Recurrent organic-rich layers (sapropels) in eastern Mediterranean sediments are enriched in Corg, Fe, and S. Sulphur and Fe are enriched in a zone immediately below the sapropels, whereas Corg is not. δ34S values of bulk ...
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(2002)Uplift of sedimentary rocks is accompanied by a wide range of physical and chemical changes that contribute to diagenesis and modify fluid flow regimes. Topography becomes a major driving force behind fluid flow patterns, ...
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(2002)A biogeochemical flux paradigm is presented which provides a conceptual and numerical framework for reconstructing the dynamical and biogeochemical regimes of ancient tide-driven continental shelves. The paradigm links ...
Now showing items 2973-2992 of 21821