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Browsing ELibrary by Title
Now showing items 2994-3013 of 21936
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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 ...
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(1990)In calculating the structural formula of tourmaline, which has the general form XY3Z6B3Si6O27(O, OH, F)4, position Z is usually occupied by aluminum, position Y predominantly by Fe2+, Mg, Al + Li, Mn, Fe3+, and position X ...
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(2004)Graphite and a fluid-generating substance (silver oxalate, oxalic acid, or anthracene) were sealed in a platinum or a gold capsule and run for a long time at elevated pressure (5.7 GPa) and temperature (1200 or 1420°C). ...
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(2004)This paper discusses recent experimental data on diamond crystallization in fluid (CO2-C, H2O-CO2-C, H 2O-C, CH4-H2O-C, and CH 4-H2-C) and carbonate-fluid (K 2CO3-H2O-CO2-C, Na 2CO3-H2O-CO2-C, and CaMg(CO3)2-H2O-CO2-C) ...
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(1999)Although it is accepted that most natural diamonds crystallized from silicate melts, and P-T conditions of their formation are estimated to be 900-1500°C and 50-60 kbar, no diamonds have been synthesized at such 'low' ...
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(2002)Crystallization of diamond and graphite from the carbon component of magnesite, upon its decarbonation in reactions with coesite and enstatite at pressures of 6–7 GPa and temperatures of 1350–1800 ° C has been accomplished ...
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(2001)A compilation of more than 1200 δ13C–N data from well-characterised diamonds show a correlation of the maximum diamond nitrogen content (i.e. a limit sector) with δ13C over the full diamond δ13C range (i.e. more than 30‰). ...
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(2002)We report for the first time experimental evidence for the nucleation and growth of diamonds from carbonatitic melts by reduction in reactions with silicon metal or silicon carbide. Experiments were carried out in the ...
Now showing items 2994-3013 of 21936