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Browsing ELibrary by Title
Now showing items 6116-6135 of 21879
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(1995)Dense hydrous magnesium silicates (DHMS), such as phase A [Mg7Si2O8(OH)6], are potential hosts for water in the Earth's mantle. Previous work has delineated the stability field of phase A (PhA) coexisting with clinoenstatite ...
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(2000)Two techniques for resolving the conductance of an electrically conductive asthenosphere are presented. The first technique combines observatory electromagnetic data in the period range of the daily variation and longer, ...
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IS THE TRANSITION ZONE AN EMPTY WATER RESERVOIR? INFERENCES FROM NUMERICAL MODEL OF MANTLE DYNAMICS (2002)Water is probably present everywhere in the Earth’s mantle today, with abundances ranging between scales of percent (%) to the parts per million (ppm). Mantle total water content is estimated to be between 10% to several ...
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(1995)The equilibria controlling silica activity and oxygen fugacity (fO2) in the upper mantle are related and all sensitive to pressure. With increasing pressure, both silica activity andfO2 will fall. Provided there is no ...
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(1998)In 1983, Lay and Helmberger [Geophys. J. R. Astron. Soc. 75 (1983) 799-837] reported the detection of a precursor to the seismic phase ScS. They attributed this precursor to a sharp seismic discontinuity located several ...
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(1995)A number of solubility studies of aluminous minerals in aqueous alkali hydroxide solutions at high pressures have been interpreted by proposing the existence of alkali-Al complexes under these conditions. This paper shows ...
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(2001)A number of researchers have reported experimental data on the Sm-Nd isotopic system of garnet and clinopyroxene from xenoliths in the kimbcrlite pipes of southern Africa and Yakutia. In the majority of cases, they do not ...
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(1999)Simulations of crystal growth in hydrous albite-quartz and albite-orthoclase systems were performed with the Jackson, Gilmer, and Temkin formulation of the Ising model. These simulations demonstrate that at 873 K (approximately ...
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(2000)In order to constrain the LIL-element distribution for subduction zone environments, exchange coefficients (KD) for K, Rb and Cs between aqueous fluids and phengite have been determined experimentally at 2.0 and 4.0 GPa. ...
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(1996)Fluid inclusions in minerals often follow isochoric-isoplethic paths through P-T space, both in nature and during microthermometry. The systematics which arise from this behaviour are the basis for interpreting fluid ...
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(2004)The use of a bentonite buffer as an engineered barrier is specified in many contemporary designs of deep-seated underground repositories for high-level radioactive wastes (HLW). Briquettes of compacted bentonite are placed ...
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(1995)This study explores the geochronological utility and analytical reproducibility of separating the high-molecular-weight fraction (HMW) from eggshells of the extinct late Pleistocene ratite, Genyornis, using disposable, ...
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(1997)Isolueshite, ideally (Na, La, Ca) (Nb, Ti)O3, was found in a hydrothermally altered pegmatite vein in ijolite-urtite of the Khibina alkaline complex, Kola Peninsula, Russia. The host rock consists of microcline, sodalite, ...
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(2003)Geometry in the simplex has been developed in the last 15 years mainly based on the contributions due to J. Aitchison. The main goal was to develop analytical tools for the statistical analysis of compositional data. Our ...
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(1999)The known notions of limiting concentration of impurities and isomorphic capacity of minerals have been applied to defective crystals using the concept of endocrypty, reinterpreted as a mode of incorporation of impurity ...
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(1997)Celadonite, glauconite and Fe-illite samples were studied by XRD, EXAFS, IR and Mössbauer spectroscopy. The samples were monomineralic and corresponded to 1M polytype. In the OH-stretching region of the IR spectra the ...
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(2003)The geometrical features and electronic structure of molecular cluster models of two edge-sharing octahedrally coordinated cations, with and without a ring of six silica tetrahedra coupled to the two octahedra, were studied ...
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(2000)The geometrical features and electronic structure of molecular clusters models of two octahedrally coordinated cations in edge-sharing octahedra were studied by means of Hartree-Fock ab initio molecular orbital calculations ...
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(2003)By using a specially designed and constructed isopiestic apparatus, we measured the osmotic coefficients at 313.2 K for the NaOH-NaAl(OH)4-H2O system with the total alkali molality, mNaOHT (mNaOH + mNaAl[OH]4), from 0.05 ...
Now showing items 6116-6135 of 21879