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Browsing ELibrary by Title
Now showing items 5520-5539 of 26297
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(2006)Highly aluminous orthopyroxene, coexisting with sapphirine, cordierite, sillimanite, quartz and garnet in various combinations, constitute granoblastic mosaic peak metamorphic assemblages in aluminous granulites from three ...
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(2006)Archaean banded iron formation (BIF) of the Voronezh Crystalline Massif (VCM) contains coexisting clino- and orthopyroxenes with exsolution textures. The pyroxene in the VCM BIF is found in two generations, with only the ...
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(1995)In oils and Precambrian- to Miocene-age source rocks from varying depositional environments, we have conclusively identified several novel 3-alkyl sterane and triaromatic steroid series, including (1) 3β-n-pentyl steranes, ...
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(2006)Production rates of cosmogenic nuclides at the earth's surface are controlled by the intensity of energetic cosmic-ray nucleons, which changes rapidly with elevation. An incomplete knowledge of how nucleon fluxes vary with ...
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(2001)In this paper we demonstrate application of the Extended Self-Similarity (ESS) concept, recently developed in turbulence physics, for geological and geophysical phenomena. The theoretical background is discussed first and ...
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(2000)We have studied with an aspect-ratio four box the thermal–chemical convective evolution with strongly temperature- and depth-dependent viscosity and moving heat sources within the extended-Boussinesq framework, in which ...
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(2004)A new model of the quiet-time, near-Earth magnetic field has been derived using a comprehensive approach, which includes not only POGO and Magsat satellite data, but also data from the Orsted and CHAMP satellites. The ...
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(2001)A new technique that uses multicollector plasma-ionization mass spectrometry (MC-ICP-MS) for the determination of Ag isotopic composition is reported. By correcting for instrument-induced mass fractionation of Ag by ...
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(2006)Contrasted tectonic styles occur in northern Iran. West of Kopet Dagh, the south Caspian basin is an aseismic and possibly rigid block involved in the collision zone between Eurasia and Arabia. To the NW, large scale ...
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(2006)Long tree-ring chronologies have been constructed in the Northern Hemisphere for dendroclimatology and palaeoenvironmental studies, radiocarbon calibration and archaeological dating. Numerous tree-ring chronologies have ...
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(2006)The extension of a previously thickened lithosphere is studied through a series of analogue experiments. The models deformed in free and boundary-controlled gravity spreading conditions that simulate the development of ...
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(1987)Extensional processes predominate in the system of island arcs and marginal seas as confirmed by complexes of parallel dikes in the corresponding paleostructures and by seismic and other data in present-day marginal seas ...
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(2006)The Los Tuxtlas volcanic field (LTVF) of late Miocene to Recent age is a key area to understand the consequences of the current subduction of the Cocos plate beneath the North American plate, as well as the competing effects ...
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(2004)DaG 896 is an olivine-rich microporphyritic rock of komatiitic composition. Both the olivine composition (Fa17.5±2.1, [Mn/Mg] = 0.0061) and the bulk oxygen isotopic composition (δ O = +2.55, δ O = +3.50) indicate that DaG ...
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(1999)Organic matter loading in continental margin sediments frequently occurs at a concentration equivalent to a monolayer coating of mineral grains, raising the question of whether adsorbed organic matter is indeed dispersed ...
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(2002)One aspect of the inherent disorder in silicate glasses and melts is the intermixing among framework units, which has important implications to the macroscopic properties of silicate magmas. We present experimental evidence ...
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(2003)We have found clear evidence of live 10Be in five normal Type A Calcium-aluminum-rich inclusions (CAIs), one normal Type B CAI, and one FUN Type A CAI, all from CV3 chondrites. The (10Be/9Be)0 ratios range from ∼0.36 × ...
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(2003)The geological history of the families Platanaceae and Hamamelidaceae is studied on the basis of original fossil material and available literature. The evolutionary stages of morphological and taxonomic diversity are ...
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(2003)We present estimates of ''realizable'' influx of selected cosmogenic isotopes, 3He, 10Be, 26Al, and 14C, and platinum group elements, Ir, Os, and Re on the earth via influx of meteoroids. We define realizable as the ...
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(1988)Magnetic fractions separated from four deep sea sediments from the Pacific Ocean were analysed for elemental abundances and isotopic ratios of noble gases by stepwise heating. A ratio of (1.8 ± 0.4) × 10−4 was observed in ...
Now showing items 5520-5539 of 26297