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Browsing ELibrary by Title
Now showing items 8706-8725 of 21936
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(2004)We report the oxygen-isotope compositions of relict and host olivine grains in six high-FeO porphyritic olivine chondrules in one of the most primitive carbonaceous chondrites, CO3.0 Yamato 81020. Because the relict grains ...
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(2001)The Oyu Tolgoi porphyry Cu-Au-(Mo) deposit is located in the Gobi Desert of southern Mongolia. The deposit consists of three main mineralized zones (North, Central, and South Oyu), interpreted to constitute at least two ...
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(2001)The occurrence of cyanobacteria (blue-green algae) blooms and the possibility of production of cyanotoxins (algal toxins) have become major concerns for drinking water providers worldwide. Ozone has been shown to be effective ...
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(2002)Traditionally P - and S -wave tomography has been based on the inversion of data that are sensitive to the desired Earth structure, and model covariance is estimated from imperfect resolution and data error propagation. ...
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(2003)Evidence is presented here that P wave amplitudes contain additional information on the Earth's heterogeneity and must be considered in future tomographic interpretations. We analyse the reliability and the variance of ...
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(2004)Here, we analyze two aspects related to converted-wave seismology: the conversion point problem and the zero-offset energy phenomenon. We show the anisotropy effect on the conversion point position and evaluate the error ...
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(2004)The Saramta massif in the Paleoproterozoic Sharyzhalgai complex, the southwestern margin of the Siberian craton, is mainly composed of spinel-peridotites with garnet-websterites; it is enclosed within granitic gneisses and ...
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(2000)Two metamorphic zones are identified in strongly deformed mica schists from the 1.9 Ga Korva Tundra Group of the Tanaelv belt: (1) a chlorite-staurolite zone tectonically overlaying gneisses of the Karelian craton, and (2) ...
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(1999)We report new experimental results obtained under nominally anhydrous conditions at 1.0-1.5 GPa on a synthetic melt whose composition is typical of extreme-composition xenolith glasses. These results demonstrate that part ...
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(1997)High-pressure liquidus experiments on three silicic, aluminous, alkaline melts, modelled on glasses found in many mantle xenoliths, show that part of this compositional range is saturated with harzburgite (or possibly ...
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(2000)The stability of members of the lazulite-scorzalite solid-solution series, (Mg,Fe)Al2 (OH)2(PO4)2, was investigated as a function of T (505 to 675 °C), P (0.1 to 0.3 GPa) and Fe/Mg ratio in hydrothermal synthesis experiments. ...
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P-T-T-DEFORMATION-FLUID CHARACTERISTICS OF LODE GOLD DEPOSITS: EVIDENCE FROM ALTERATION SYSTEMATICS (1998)Structurally hosted lode gold-bearing quartz vein systems in metamorphic terranes possess many characteristics in common, spatially and through time; they constitute a single class of epigenetic precious metal deposit, ...
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(2000)The P21/c clinopyroxene kanoite (ideally MnMgSi2O6) was studied as a function of pressure and temperature using powder X-ray diffraction, differential scanning calorimetry (DSC) and optical methods. The temperature of the ...
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(1990)Long-range controlled source seismic experiments yield detailed information about the velocity depth structure of the lower lithosphere. Between Ireland and Northern Britain three such profiles sample almost the same portion ...
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(2003)We compare the P-wave velocities (Vp) of 696 dry samples measured at pressures up to 0.6–1.0 GPa with values calculated from the volume fraction and room pressure elastic constants of each constituent mineral using 16 ...
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(2001)New biostratigraphic data based on radiolarians recovered from deep within the oceanic crustal section of Ocean Drilling Program Hole 801C in the western Pacific, along with existing radiometric information, date this ...
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(1996)Previous studies have shown that the Pacific geoid and gravity fields exhibit lineated anomalies, trending approximately in the direction of absolute plate motion over the underlying mantle. Because the undulations obliquely ...
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(2003)The computer package FLUIDS contains five sets of computer programs written in C++ for the calculation of fluid properties. Both model fluids and data from fluid inclusions can be analysed in the programs. Bulk density, ...
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(2006)Rastsvetaevite was found on Mt. Rasvumchorr (Khibiny alkaline massif, Kola peninsula) occurring in a hyperagpaitic pegmatite as irregularly shaped grains 1-2 mm in size and their aggregates, up to 2 cm across. It is ...
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(2004)Palaeogeography (specifically palaeotopography and palaeobathymetry) provides an essential boundary condition for computer-based atmosphere and ocean modelling. It also provides the geographic context for understanding ...
Now showing items 8706-8725 of 21936