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Browsing ELibrary by Title
Now showing items 1369-1388 of 21879
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BACKSCATTERED 39AR LOSS IN FINE-GRAINED MINERALS: IMPLICATIONS FOR 40AR/39AR GEOCHRONOLOGY OF CLAY (2000)The interpretation of 39Ar recoil loss from clay minerals during application of the 40Ar/39Ar analytical technique is controversial. To further explore the mechanism for 39Ar recoil loss, we quantified the effects of ...
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(2000)The publication of Backscattered Scanning Electron Microscopy and Image Analysis of Sediments and Sedimentary Rocks marks a significant point in the history of sedimentary petrology. The evolution of the scanning electron ...
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(1987)Initial studies of the ability of silicate bacteria to break down smectite minerals used four smectite specimens from the Askani clay deposit, Georgia. They were subjected to quantitative chemical, as well as by X-ray and ...
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(1999)Transmission electron microscopic (TEM) analyses of freshwater biofilms and bacterial cells, grown in experimental culture, have shown that these microorganisms are commonly associated with fine-grained (Fe, Al)-silicates ...
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(1999)Mobilization of contaminant Pb and other cations from a weathered andesite was examined by conducting water-rock leaching experiments to measure release rates of the major and minor elements found in the bulk rock. Experiments ...
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(1996)Polonium has been observed as the sole α-emitting nuclide in groundwaters of central Florida, in the absence of its radiogenic parents, at levels of 1,000 dpm/l or more. Because of the chemical similarity of Po to S (both ...
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(1999)The study of the fossilization processes of modern cyanobacteria provides insights needed to recognize bacterial microfossils. The fossilization of cyanobacteria is discussed and images of recent and fossil bacteria and ...
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(1996)It is well known that many microorganisms can reduce the highly toxic soluble selenium oxyanions (selenate and selenite) to a much less toxic insoluble form, namely elemental selenium. We are developing a bacterial treatment ...
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(1990)In an area of the Eastern Aldan region, on the periphery of a large body of rocks of the ultramafic-alkalic carbonatite (UAC) association, in the middle of a formation of carbonate (dolomitic) rocks of Vendian to Early ...
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(1983)The comparison of geological and geophysical data from the Kenya and Baikal rift zones permits us to consider the formation of these zones to be associated with the development of wide asthenospheric upwellings beneath ...
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(2002)The basic stratigraphic domains of the Late Precambrian in Siberia are the Uchur-Yudoma, Baikal-Lena, and Priyenisel-Angara structure-facies areas (SFA) of the periphery of the old Siberian Platform. Correlation of local ...
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(2003)По серии позвонков из известного верхнемелового местонахождения Баин-Дзак (Монголия) описан рогатый динозавр Bainoceratops efremovi gen. et sp. nov. Особенности морфологии отличают новую форму от типичного для джадохтских ...
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(2003)A new horned dinosaur, Bainoceratops efremovi gen. et sp. nov., is described on the basis of vertebral series from the well-known Bain-Dzak locality (Mongolia). The new form is distinguished from Protoceratops andrewsi ...
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(2002)We propose that Baltica was geographically inverted throughout the Neoproterozoic and therefore suggest reassessment of the classic Wilson Cycle paleoreconstruction de- picting an Atlantic-type early Paleozoic (Iapetus) ...
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(1992)In light of recent additions to the Palaeozoic palaeo-magnetic data-base, particularly for the Ordovician era, a revised apparent polar wander (APW) path for Baltica has been constructed following a rigorous synthesis of ...
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(2001)The mineralogy, chemistry and stratigraphy of Precambrian banded iron formations have been extensively documented, yet the way such formations are produced remains a subject for debate. Differentiation by varving, microbial ...
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(1987)Among the obligatory components of the Precambrian iron formation rock (PIF) are the quartzite layers interstratified with ore and silicate layers. On the facies distribution of rocks of Archean and Lower Proterozoic iron ...
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(2004)Barite (BaSO4) deposits generally arise from mixing of soluble barium-containing fluids with sulfate-rich fluids. While the role of biological processes in modulating barium solubility has been shown, no studies have shown ...
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(2002)Although barite nodules are extremely rare in the World Ocean, they are rather widespread in the Japan Sea. They were first discovered by Japanese scientists in the Honshu Island borderland (Okada et al., 1971; Sakai, ...
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(2004)The presence of relatively abundant bedded sulfate deposits before 3.2 Ga and after 1.8 Ga, the peak in iron formation abundance between 3.2 and 1.8 Ga, and the aqueous geochemistry of sulfur and iron together suggest that ...
Now showing items 1369-1388 of 21879