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Browsing ELibrary by Title
Now showing items 8350-8369 of 21936
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(2001)The Fe-Ni metal within chondrites has been postulated to have originated either through condensation or as a byproduct of chondrule formation. To test these hypotheses, we studied metal in three Renazzo-like carbonaceous ...
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(2003)Osmium-rich Pt group element (PGE) alloys occur worldwide in association with chromite in ultramafic (peridotite) complexes. It has been suggested that these Os-rich alloys formed under extreme P-T conditions in the lowermost ...
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(1996)A simple model that accounts for the formation of the Mn maximum in the oxygen minimum is presented here. In this model, Mn is proposed to cycle in a constant proportion to carbon, as do nitrogen and phosphorous. Superimposed ...
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(2004)The galactic version of geochronological scale, which is based on hypothesis that its basic reference points correspond to moments of geological time, when our Solar System traversed the spiral arms of Galaxy, is analyzed. ...
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(2002)The Malyshevsk (Mariinsk) beryllium-emerald deposit is the most important object in the Izumrudnye Kopi ore field (the eastern slope of the Middle Urals). Its genetic type and formation conditions are specified after ...
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(1989)Mathematical modelling of thermal thickening of the lithosphere with time indicates that the thickness of the lithosphere beneath the Siberian platform in the late Permian and Triassic, when intensive trapp magmatism ...
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(2001)According to experimental data on granitic and nepheline syenitic systems, Ta, Nh, Zr, and Hf in equilibrium aluminosilicate acid aluminofluoride melts are preferably concentrated in the Former. Crystallization differentiation ...
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(1990)An ore show of phosphate raw material has been found for the first time on the east slope of the Urals, in the basin of the Man'ya River in the Circumpolar Urals. The residual-infiltrational or chemogenic-mechanogenic ...
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(2001)The convective flow pattern beneath the oceanic lithosphere is strongly influenced by the movement of the lithospheric plate on top. Assuming upper mantle convection, the wavelengths, geometric structure and time of onset ...
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(1999)The growth rate of an inhomogeneity at the source of a future earthquake is investigated as a function of time and the magnitude of the earthquake. The results are compared with field observations.
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(2004)Four or five anterior caudal vertebrae of archaic horned dinosaurs (Protoceratopidae) have the heterocelous centrum. The cranial and caudal articular surfaces of these centra are posteriorly concave in the ventral view and ...
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(2002)The year 2000 was marked by the anniversaries of some of the oldest paleontologists who pioneered in different fields of paleontology. Most of them were talented teachers and many participated in discoveries of deposits ...
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(2001)A method that directly solves the boundary problem of flow to a horizontal-well in an anisotropic confined aquifer is provided. This method solves the point source problem first, and then integrates the point source solution ...
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(2001)Various proofs of the Legendre Addition Theorem, as they appear in the mathematical literature, are outlined. The proof of the mentioned theorem, based on the induction method, is analyzed in detail.
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(2001)The inference of denudation rates from the temperature-time histories of rocks is not straightforward, because the geothermal gradient evolves with time, as denudation advects heat towards the land surface. We show that ...
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(2003)The Mie scattering theory shows that the presence of randomly distributed submicroscopic inclusions with narrow size distribution and a refractive index n i in a matrix with different refractive index n m may give rise ...
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(1989)In the course of a microprobe study of volcanic glass, we obtained new data suggesting the possibility of a different mode of formation of amygdules. We studied samples of oceanic volcanic glass in the form of incrustations ...
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(1998)The observation that basic igneous rocks most commonly are holocrystalline under a wide spectrum of cooling regimes implies that cooling and crystallization can be uncoupled and considered separately. This is tantamount ...
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(2002)Poaceae pollen is abundant in fossil records and is often used as a paleoclimatic indicator. A common interpretation is to link increases in Poaceae pollen abundance to increased regional aridity. However, the representation ...
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(2004)Taking account of the size distribution of planetesimals inferred from recent theoretical studies of planetesimal accumulation, we examine gravitational separation of noble gases inside large porous planetesimals in the ...
Now showing items 8350-8369 of 21936