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Browsing ELibrary by Title
Now showing items 4678-4697 of 22924
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(2003)The Rytov approximation that expresses phase residuals as an explicit function of the slowness perturbations, is also related to the generalized Radon transform (GRT). Using Beylkin's formalism, we derive the corresponding ...
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(1990)We have measured carbon at the marine K/T boundary site SM-4 at the Sumbar river in Turkmenia, USSR, which has an undisturbed Ir profile and the largest known Ir anomaly (580 ng/cm2). Twenty samples, ranging from −100 to ...
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(1999)Worldwide late Pleistocene terrestrial mammal faunas are characterized by stratigraphic associaiicns of species that now have exclusive geographic ranges. These have been interpreted as either taphonomically mixed or ...
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(2002)The study of septal patterns in ammonoids has been centered on functional and/or constructional issues. Complexly fluted septa have been considered as complementary structures that reinforce the ammonite shell, their frilled ...
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(1989)Originally sedimentary sulfate-bearing rocks in the Precambrian of the Baltic shield were first identified in 1985. Sulfate sulfur was found in significant amounts only in chemogenic metacarbonate rocks and metamorphosed ...
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(1987)Cliachite or alumogel (ALOOH + aq) is a gel-like, X-ray-amorphous aluminum hydroxide, and has so far been described only in bauxite and laterite, where it is mixed with boehmite, hydrargillite and diaspore and is primary ...
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(1989)Conodonts, one of the leading groups used for detailed stratigraphy, are rare in the Triassic deposits in the south of the USSR. In 1986 and 1987 the authors made a special search for conodonts in the Triassic of the ...
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(1989)Analysis of the regional stress field in the upper crust of continents and oceans showed that the rocks here are undergoing active horizontal compression and subvertical extension. Hydrocarbons here are generated in the ...
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(1989)A fine-grained oval 5 x 7 mm inclusion (designated ALD-03) from the Allende meteorite was analyzed. A delta D value of -75 per mil was determined which may characterize the composition of hydrogen in other silicate and ...
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(1995)Dissolved and colloidal trace element concentrations (Cd, Cu, Fe, Ni and Pb) were determined in the Ob and Yenisey river-estuary systems and in the adjacent Kara Sea in September 1993. The data show a natural low concentration ...
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(1989)Numerous diamond finds in nonkimberlitic, basaltoid and ultramafic rocks and their serpentinized varieties, commonly with pyrope garnet, as well as in lamproites and mineralogically different types of eclogite, have greatly ...
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FIRST DIAMOND-BEARING PHLOGOPITE PYROXENITE FIND (A XENOLITH FROM THE MIR KIMBERLITE PIPE, YAKUTIA) (1987)To settle the question of whether phlogopite can exist at high pressures and temperatures in upper mantle rocks, the authors give the results of their study of a diamond-bearing phlogopite pyroxenite specimen from the Mir ...
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(2004)The first findings of dinocysts Pseudokomewuia in Western Siberia are analyzed from the viewpoint of their significance for solving the questions of stratigraphy, paleogeography and paleoecology of basins in Cenozoic era.
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(2000)We present the first direct dating by 14C-accelerator mass spectrometry of three Late Pleistocene syngenetic ice-wedges from the Seyaha cross-section. They are representative of permafrost with multistage ice-wedges from ...
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(1998)Some assemblages of Late Paleozoic radiolarians are first established in Yakutiya. The radiolarians occur in hemipelagic deposits reduced in thickness. They are extracted from siliceous tuffites by using the hydrofluoric ...
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(2003)The first occurrence of stishovite in an iron meteorite, Muonionalusta (group IVA), is reported. The mineral occurs intimately mixed with amorphous silica, forming tabular grains up to ˜3 mm wide, with a hexagonal outline. ...
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(1988)While thoroughly studying drill cores, recovered during subsurface geologic mapping of the Fedorovka tectonic zone near the north edge of the Azov crystalline basement block, the authors detected and studied dumortierite, ...
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(2001)Finds of juvenile parareptiles are rare in the fossil record. We describe partial upper dentition with large vacuities between bones belonging to a neonate pareiasaur (preserved skull fragment is 22.4 mm long). The specimen ...
Now showing items 4678-4697 of 22924