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Browsing ELibrary by Title
Now showing items 3234-3253 of 21936
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(2004)Compounds that contain the autunite-type sheet and divalent cations (Mg, Mn, Fe, Co, Ni) in their interlayers have been synthesized by diffusion in gels or by hydrothermal methods, and their crystal structure determined. ...
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(2002)Polypteriformes (or Cladistia) and Lepisosteiformes (or Ginglymodi) are two groups of freshwater fishes with ganoid scales. The earliest fossil records of these taxa are Albian (Lepisosteiformes) and Cenomanian (Polypteriformes) ...
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(2003)Curves depicting the diversity dynamics of fusulinid genera in general and in some individual biogeographic provinces are provinces are plotted. Some of them illustrate dynamics of appearance and extinction of fusulinid ...
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(2003)Djerfisherite K6Na(Fe,Ni,Cu)24S26Cl, first discovered in meteorites [1], was subsequently found in Cu–Ni ores, kimberlites, alkaline ultrabasic rocks and car-bonatites, peralkaline rocks, and in skarns around alka-line ...
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(2006)Rare earth elements (REE) concentrations of Archean and Proterozoic chemical sediments are commonly used as proxies to study secular trends in the geochemistry of Precambrian seawater. In addition, similarities in the REE ...
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(2000)The Messoyakha gas field has long been considered a world unique field where gas is extracted from natural gas hydrates. At the same time, this idea has been based solely on implicit evidence. The present study addresses ...
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(2003)The mainly dipolar geomagnetic field generated by the geodynamo within the Earth's liquid core has reversed its polarity many times in the past. This succession of intervals of alternate polarity defines the geomagnetic ...
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(2003)The Donbas Foldbelt (DF) is the uplifted and deformed part of the up to 20-km-thick Dniepr-Donets Basin (DDB) that formed as the result of rifting of the East European Craton (EEC) in the Late Devonian. Uplift, especially ...
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(2002)This paper deals with all solid sedimentary fossil fuels, i.e. coal, the main one for geological reserves and resources, peat, and oil shales. Definitions of coal (<50% ash) and coal seam (thickness and depth limits) are ...
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(2005)We obtained new archeointensity data from French faience potsherds dated from the 17th to 19th century. These results further document the occurrence of sharp changes in geomagnetic field secular variation in Western Europe ...
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(2002)In this study, we investigate the effects of bacteria on metal transport through mineral-filled columns, and how the effect varies with pH and mineralogy. We measured Bacillus subtilis and aqueous Cd transport through ...
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(1998)Consideration of alkali-feldspar dissolution ratesThe term alkali-feldspar is used in the present study to denote those feldspars that dissolve via aluminum deficient precursor complexes [Oelkers, E.H., Schott, J., Devidal, ...
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(2006)Laboratory determined mineral weathering rates need to be normalised to allow their extrapolation to natural systems. The principle normalisation terms used in the literature are mass, and geometric- and BET specific surface ...
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(2002)It has recently been reported that the electron capture decay constant for 7Be varies by as much as 1.5% in different oxidic compounds of Be and that application of 400 kbar pressure to a Be(OH)2 gel increases its 7Be decay ...
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(2002)The fact that basin inversion is possible long after the cessation of rifting indicates that at least some sedimentary basins are characterized by permanent relative weakness. This paper investigates whether the steady-state ...
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(2001)Hydrogen isotope investigations on hydrothermal quartz reveal two H-reservoirs: (i) trapped fluid inclusions, and (ii) structurally bound water in homogenously distributed small clusters or bubbles. Varying mixing ratios ...
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DOLOMITE SURFACE SPECIATION AND REACTIVITY IN AQUATIC SYSTEMS - RATES DEPEND ON SURFACE SPECIATION (1999)The surface charge of dolomite (CaMg(CO3)2) was measured as a function of pH (6.5-11.5), pCO2 (10-3.5, 0.01, and 0.96 atm) and ionic strength (0.01, 0.1, and 0.5 M NaCl) using potentiometric titrations in a limited residence ...
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(1994)In early calcite carbonatites of the Kovdor ore deposit four morphological types of dolomite are represented. In the first type, dolomite microcrystals occur as lamellae enclosed by optically continuous calcite. In the ...
Now showing items 3234-3253 of 21936