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Browsing ELibrary by Title
Now showing items 7208-7227 of 21768
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(1995)The importance of adsorption is virtually unknown at temperatures of > 25°C. This study indicates that interactions between organic acids and mineral surfaces may control Al transport during clastic diagenesis. Oxalate ...
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(2000)Although dissimilatory iron reducing bacteria (DIRB) are capable of reducing a number of metals in oxides and soluble forms, the factors controlling the rate/extent of magnetite reduction and the nature of the mineral ...
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(1998)In order to constrain the role of fluid phases during metasomatic processes in the upper mantle, trace element partition coefficients for Ba, Sr, Pb, Nb, Ta, Zr, Hf, Ti, La, Ce, Sm, Tb, and Yb between aqueous fluids and ...
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(1998)In order to constrain the role of fluid phases during metasomatic processes in the upper mantle, trace element partition coefficients for Ba, Sr, Pb, Nb, Ta, Zr, Hf, Ti, La, Ce, Sm, Tb, and Yb between aqueous fluids and ...
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(2004)Phase equilibria in the system CaO–MgO–SiO2–CO2–H2O–NaCl are calculated to illustrate phase relations in metacarbonates over a wide-range of P–T–X[H2O–CO2–NaCl] conditions. Calculations are performed using the equation of ...
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(1995)Aragonite, high-Mg calcite, and Mg-free calcite have been grown under monitored laboratory conditions to investigate mineral-fluid partitioning and isotopic fractionation of boron into carbonates. At pH # 8, both polymorphs ...
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(2003)The uranium and thorium decay series (hereafter "U-series") include the nuclides of ten elements, all of which can be found at trace levels in rocks and minerals. The relatively short ...
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(2003)This experimental study examines the mineral/melt partitioning of incompatible trace elements among high-Ca clinopyroxene, garnet, and hydrous silicate melt at upper mantle pressure and temperature conditions. Experiments ...
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(1996)Bacteria are very small (~ 1.5 μm3), but have the largest surface area to volume ratio of any life form. As a result, by providing interfaces for sorption of metal cations, bacteria are efficient scavengers of dilute metals ...
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(2003)Reservoirs are sources of greenhouses gases to the atmosphere, primarily due to organic carbon mineralization in flooded plants and soils to carbon dioxide (CO2) and methane (CH4). Floating peat islands are common in ...
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(2001)Evidence provided by fluid inclusions points to a broad interval of physical conditions and fluid compositions at which the mineralization was produced: temperatures of 360-132 degreesC, pressures of 2180-130 bar, fluid ...
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(1988)We consider examples of albitization in rare-metal sodium-lithium pegmatites, genetically related to Hercynian plumasitic two-mica leucogranites. As early as the beginning of prospecting, we noted an empirical relationship ...
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(1990)For understanding the role of mixing processes in gabbro-granite magmatism, postgranitic dikes of lamprophyre and diorite porphyry are especially interesting because mineralogic criteria of both mafic and granitic rocks ...
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(2003)This paper presents the first data on mineral composition of Khubsugul sediments studied in core HSG-01-8. The core was taken by the Benthos gravity corer at the flattened floor in the central part of the lake during the ...
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(2002)The importance of impact cratering on terrestrial planets is obvious from the abundance of craters on their surfaces. On Earth, active geological processes rapidly obliterate the cratering record. To date only about 170 ...
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(1989)We investigated a geologically complex deposit in the Eastern Sayan region. It is confined to a steeply dipping (80°) shale-carbonate member that is inferred to be of Riphaean age and is sandwiched between Paleozoic granite ...
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(2004)Inorganic magnetite nanocrystals were synthesized in an aqueous medium at 25°C, atmospheric pressure, ionic strength of 0.1 M, oxygen fugacity close to 0, and under controlled chemical affinity, which was maintained constant ...
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(2000)X-ray diffraction (XRD), Rb-Sr isotope analysis, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and Fourier transform infrared (FTIR) methods were used to study diagenetic illite and ...
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(2003)The profile of the supergene zone of the Zapadno-Ozernoe massive sulphide Cu-Zn deposit differs from the classic model (Emmons, 1917) in that it includes a prominent dark sooty subzone rich in secondary sulphides. This ...
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(1999)We report the results of oxygen isotopic analyses made on mineral separates prepared from chondrules and whole meteorites (UOCs). Feldspar/glass (mainly chondrule mesostasis) is more 16O-poor than the olivine/low Ca pyroxene ...
Now showing items 7208-7227 of 21768