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Browsing ELibrary by Title
Now showing items 31-50 of 21821
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(2002)We analyzed 238U, 234U, 232Th, 230Th, and 226Ra by thermal ionization mass spectrometry (TIMS) and Ba by inductively coupled plasma optical emission spectrometry (ICP-OES) on eight Mn/Fe crusts from the Mecklenburg Bay (SW ...
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(2002)We analyzed 238U, 234U, 232Th, 230Th, and 226Ra by thermal ionization mass spectrometry (TIMS) and Ba by inductively coupled plasma optical emission spectrometry (ICP-OES) on eight Mn/Fe crusts from the Mecklenburg Bay (SW ...
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(1999)The sources of the natural radionuclides 234Th (half-life = 24 d) and 7Be (half-life = 53 d) to the partially mixed Hudson River estuary are distinctly different: 234Th is produced from decay of dissolved 238U that varies ...
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234U 238U MASS SPECTROMETRY OF CORALS: HOW ACCURATE IS THE UTH AGE OF THE LAST INTERGLACIAL PERIOD? (1991)Direct measurement of U and Th by mass spectrometry recently provided a spectacular improvement in the precision of coral dating by the UTh disequilibrium method [1]. Mass spectrometric data also provide a much better ...
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(1995)The concentration (C) of dissolved 238U, 234, 232Th and 230Th in fresh and brackish waters from the Baltic Sea were determined using TIMS. The brackish waters range in salinity from that of sea water (SW) to 2.5%%. C238U ...
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(1997)23Na and 133Cs MAS NMR methods were used to study the adsorption sites and atomic-scale dynamics of Cs, Na, and their mixtures on the surfaces of illite, kaolinite, boehmite, and silica gel reacted with 0.1 M NaCl and mixed ...
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(2003)The Rumuruti chondrites (R chondrites) constitute a new, well-established, chondrite group different from carbonaceous, ordinary, and enstatite chondrites. Most samples of this group are gas-rich regolith breccias showing ...
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(2000)By combining data from oxide melt solution calorimetry and 29Si MAS-NMR spectroscopy, the enthalpy for short-range Si.Al ordering in β-eucryptite (LiAlSiQ4) was determined for a series of samples prepared by glass annealing. ...
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(2003)The alkali leaching of two aluminosilicates, kaolinite and metakaolinite, with aqueous NaOH has been studied. Both silicates gave hydroxysodalite (HS) with or without the evanescent zeolite NaA. X-ray diffraction and ...
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(2002)We have studied short-range cation ordering across the diopside (CaMgSi2O6)-Ca-Tschermak pyroxene (CaAl2SiO6) (Di-CaTs) solid solution in samples synthesized at 1400 °C and 2 GPa, for 24 hours. Peak positions in 29Si MAS ...
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(2002)A two-dimensional model of the crust and uppermost mantle for the western Siberian craton and the adjoining areas of the Pur-Gedan basin to the north and Baikal Rift zone to the south is determined from travel time data ...
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(1997)3-D models are offered for velocity distribution and crustal and upper mantle structure in areas of large earthquakese (Shemakha, Spitak, and Groznyi) and mineral deposits (Muruntau deep borehole area). The models were ...
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(1998)One of the most important problems of geoscience is to explain the drift mechanism of continents uniting periodically to form supercontinents similar to Pangea. This work presents for the first time a numerical model of ...
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(2000)The principal difficulty in finding detailed tomographic images is caused by signal-generated noise such as that due to adjacent inhomogeneities. This difficulty cannot be overcome by any of the techniques available in ...
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(2004)Reflection/refraction process is studied to calculate the energy distribution and transmission in a general anisotropic poroelastic solid half-space in contact with a fluid half-space. Biot's theory is used to study the ...
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(2004)The Olondo greenstone belt is a unique structure lying in the Aldan Shield. The Aldan Shield is the largest basement salient in the Siberian craton. The Subgan granite-greenstone complex includes sedimentary, volcaniclastic ...
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(2003)В первой из серии статей "300 лет жизни камчатских вулканов" рассмотрена и проанализирована 350-летняя история эруптивной активности вулкана Молодой Шивелуч - самого северного из действующих вулканических аппаратов на ...
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(2004)В первой из серии статей "300 лет жизни камчатских вулканов" рассмотрена и проанализирована 350-летняя история эруптивной активности вулкана Молодой Шивелуч - самого северного из действующих вулканических аппаратов на ...
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(1995)Our studies of the 105 kg Chico L chondrite show that it contains #60% impact melt and the largest volume of impact melt recognized in stony meteorites. We suggest that it is part of a much larger dike complex that formed ...
Now showing items 31-50 of 21821