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Browsing ELibrary by Title
Now showing items 6121-6140 of 21934
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(2002)The determination of FeO of geologic materials by modern instrumental methods (such as atomic absorption spectroscopy (AAS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray fluorescence (XRF), etc.) ...
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(2005)Phosphorus is one of the nutrients most commonly limiting net primary production in soils of humid tropical forests, mainly because insoluble Al and Fe phosphates and strong sorption to Fe(III) (hydr)oxides remove P from ...
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(1999)The solubility of natural and synthetic hematite (α-Fe2O3) was measured in NaOH–NaCl solutions (0.007 ≤ m(NaOH) ≤ 2.0) between 60 and 300°C at saturated water vapour pressure and under excess oxygen. Solubility constants ...
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(1988)We studied the possibility of using metamorphic diopside-rich and diopside-bearing rocks, virtually devoid of iron, titanium and alkali oxides, in various silicate technologies. Such rocks are widespread in the Precambrian ...
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(2001)Fe,Ni-sulfide grains in nine anhydrous chondritic porous (CP) interplanetary dust particles (IDPs) and one hydrated chondritic smooth (CS) IDP were examined using 200 and 400 keV transmission electron microscopy.Crystal ...
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(1999)We have applied a stepwise pyrolytic extraction technique to eleven individual lunar regolith grains to investigate the compositions of light noble gases embedded in grain surfaces by solar wind irradiation, with emphasis ...
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(2003)We investigate the potential advantages and pitfalls of using an irregular interface parametrization in 3-D wide-angle seismic traveltime tomography. Several synthetic tests are performed using an interface surface consisting ...
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(2001)Mathematical representation of the dynamics of a highly viscous, rheologically heterogeneous, incompressible medium affected by gravity is considered. The solution is defined by reducing the original system of differential ...
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(2004)A simple analysis suggests that a time interval of more than about 5000 Myr is needed for the random palaeogeographic test to be effective in assessing the geomagnetic axial dipole assumption. This time is so long as to ...
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IS AMINO ACID CHRONOLOGY APPLICABLE TO THE ESTIMATION OF THE GEOLOGICAL AGE OF SILICEOUS SEDIMENTS? (2002)There are few conventional dating methods that can be used to estimate the geological age of siliceous sediments on the order of 104-105 yr. In contrast, methods such as δ18O are available for dating carbonate-containing ...
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(2000)We tested the hypothesis that, on the scale of a decade, earthquakes deeper than 60 km are produced at an approximately constant, that is, stationary Poissonian rate. We selected earthquakes with depths greater than 60 km ...
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(2003)Macroscopic transport properties of natural porous media, such as the permeability tensor K, are the sum of uncountable microscopic events. Understanding how these microscopic events come together to yield a descriptive ...
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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 ...
Now showing items 6121-6140 of 21934