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Browsing ELibrary by Title
Now showing items 6660-6679 of 21934
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(1990)Liδ18OSiO2 relationships have been examined for suites of spilitized basaltic rocks (DSDP 504B; Xigaze Ophiolite; Blanco Fracture Zone; Greater Caucasus; Rhenohercynian Fold Belt) and intra-plate evolved tholeiites (Northern ...
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(1995)The chemical and mineralogical compositions of Llanvirnian (Ordovician) iron and associated phosphate ooids from Sweden, Estonia and Russia have been examined. The oolites are generally thin and lean (mud supported), and ...
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(1999)This paper presents the results of seismological observations carried out in the greater Sochi area using a network of self-contained seismic stations to record low-magnitude seismicity during the period November 1995 to ...
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(2003)The sections existing in the Permo-Triassic effusive traps of the Siberian Platform (SP) are of three types: (1) monotonous, with slightly altered composition of tholeiites within several succesive formations in the same ...
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(1999)Pyrope-grossular solid solutions, (Mg,Ca) 3 Al 2 Si 3 O 12 , of composition Py 85 Gr 25 and Py 75 Gr 25 were synthesized at 1000, 1200, and 1400 degrees C and 30 kbars in a piston-cylinder device. The synthetic garnets ...
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(2000)Small scale structures produced by deformation and compaction are common in igneous, metamorphic, and sedimentary rocks, and are often used to define foliation and lineation directions. Analytic solutions for models of ...
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(1998)At any set of thermodynamic conditions a mineral will have some well defined equilibrium crystal structure. However, this structure can be locally disturbed by crystal defects, such as domain walls or solute atoms. This ...
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(2002)Trend analysis is widely used for detecting changes in hydrological data. Parametric methods for this employ pre-specified models and associated tests to assess significance, whereas non-parametric methods generally apply ...
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(2002)The substitution in layered double hydroxide-like phases (LDH) of composition (Co2+1-y Cu2+y)2Al3+(OH)6Cl · n H2O (0 y 1) was studied by X-ray diffraction and X-ray absorption spectroscopy. It was found that the lamellar ...
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(1989)The special features of this investigation are as follows: 1) we use readily accessible data; 2) the prediction is truly local, and the locations of the fields are determined within about 75 km; 3) the effectiveness of the ...
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(1990)The prediction of petroleum and natural gas fields (especially very large ones) is a very interesting scientific problem and a highly important economic tasks. Other publications by the present writers using examples from ...
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(2004)Pyrope-knorringite garnets, Mg3(Al1-X Cr3+X)2Si3O12 with X=0.25, 0.50, and 1.00, were synthesized between 9 and 16 GPa and 1300 and 1600 °C, using multianvil high-pressure techniques. The garnets with X=0.25 and 0.50 are ...
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(1997)Stratigraphic investigations of the Precambrian in Karelia and the Kola Peninsula, which are the type area for the pre-Riphean part of the Proterozoic of northern Eurasia, demonstrate a priority of local stratigraphic ...
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(2001)Recent seismological observations reveal the presence of seismic anisotropy in localized regions at the base of the mantle within an otherwise isotropic lower mantle. These regions can be placed in a tectonic context, ...
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(2001)The incorporation of hydrogen (deuterium) into the coesite structure was investigated at pressures from 3.1 to 7.5 GPa and temperatures of 700, 800, and 1100 °C. Hydrogen could only be incorporated into the coesite structure ...
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(1999)The use of a direct crystallographic technique is reported for locating Cr atomic sites in a mullite containing 11.5 wt% Cr 2 O 3 by monitoring variations in characteristic X-ray emission rates as a function of fast electron ...
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(1998)The loess/paleosol sequences of Central Asia are continuous terrestrial records of the Quaternary period and enable detailed comparison with paleoclimatic archives such as marine and ice core records in order to reconstruct ...
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(1999)Loess rocks are widespread on the Earth. They occupy about 10% of global land area. Their thickness reaches up to 300 m in places and even more. Loess rocks differ in the different parts of the Earth. The 'warm' and the ...
Now showing items 6660-6679 of 21934