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Browsing ELibrary by Title
Now showing items 10209-10228 of 21934
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(2001)The application of continuum mechanics and microstructural analysis to geological studies over the past 30 years has spurred earth scientists to reassess fundamental tectonic processes such as subduction, collision and ...
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(1999)The physical effects of air or argon bubbles on the rheology of a calcium aluminosilicate melt have been measured at temperatures ranging from 830° to 960°C, at 1 bar pressure. The melt composition is SiO2:64, Al2O3:23, ...
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(2003)Considerable progress has been made over the past decade in under-standing the static rheological properties of granitic magmas in the continental crust. Changes in H 2 O content, CO 2 content, and oxidation state of the ...
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(2001)Triaxial compression testing of pure, polycrystalline water ice I at conditions relevant to planetary interiors and near-surface environments (differential stresses 0.45 to 10 MPa, temperatures 200 to 250 K, confining ...
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(2000)Reactivation and tectonic inversion are the result of the interactions between changes in the stress field and the rheological properties of the lithosphere. The rheology varies in time and space as a function of variations ...
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(1996)Five carbonaceous chondrites (including the CI chondrites Orgueil and Ivuna) were analyzed by spark source mass spectrometry (SSMS) for the platinum-group elements Ru, Rh, Os, Ir, Pt, as well as W, Re, Au, Th, and U. ...
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(1990)Several zones of disseminated chalcopyrite-bornite mineralization have been recorded in the Nomgon differentiated pluton of troctolite-anorthosite-gabbro composition, located in the Orkhon-Selenga basin and surrounded by ...
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(1997)This paper describes the Karymshina Complex of the volcanic rocks of a rhyolite - dacite association. The composition of the complex and its structural setting are discussed. Based on plant imprints in its tuff and thirteen ...
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(1996)The vesiculation of a peralkaline rhyolite melt (initially containing ~0.14 wt.% H2O) has been investigated at temperatures above the rheological glass transition (Tg≈530 °C) by (a) in situ optical observation of individual ...
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(2003)The internal microstructure of a ferromanganese nodule (#2392, from 154°37.52'W, 9°37.56'N, at water depth 5194 m) was examined in detail on polished sections, and radiometrically dated (230Thex/232Th) along a high-resolution ...
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(2004)Structural relationships in the Kivakka intrusion were established, and rhythmic phase layering (Kivakka type layering) was quantitatively characterized. Rhythmic layering occurs in the Kivakka intrusion as contrasting ...
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(2001)Oscillatory zoning in carbonates of gold ore deposits Darasoon, Shkolnoye and silver-polymetallic deposit Prognoz is studied. Alternation of dolomite and Mn-ankerite rhythms is observed at Darasoon deposit. Single rhythm ...
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(2003)Today, the term ria is rarely used by sedimentologists or stratigraphers, although it embodies all the characteristics of the so-called incised valleys - a topic of considerable interest since the increased understanding ...
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(2003)The Early Proterozoic banded iron formation (BIF) of the Mikhailovskoe iron deposit differs from other known Precambrian BIF by the low Al# and high Fe3+/(Fe3+ + Fe2+) ratios. The elevated oxygen fugacity during the ...
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(2003)The topography of ocean ridges and rifts show a distinct asymmetry. The eastern sides of the East Pacific Rise, the Mid-Atlantic Ridge, and the NW Indian Ridge are, on average, 100-300 m more elevated than the conjugate ...
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(2004)We report a comparative study on the high pressure (HP) structural behaviour of a fibrous zeolite (with EDI topology) on the basis of rigid unit modes (RUM) modelling and previously published single-crystal X-ray diffraction. ...
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(2004)Partial ring currents during the main phase of a geomagnetic storm cause a longitudinal asymmetry in the magnetic field at the earth’s surface at low and mid latitudes. The horizontal component of the magnetic field obtained ...
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RIPHEAN SEDIMENTARY SEQUENCES OF THE EASTERN AND NORTHEASTERN MARGINS OF THE EASTERN EUROPEAN CRATON (2002)The Riphean history of depositional basins in the study region can be divided into Early-Middle Riphean and Late Riphean phases. Throughout the Riphean, clastic material was supplied chiefly from eastern regions of the ...
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(2004)Extensive methane hydrate layers are formed in the near-surface sediments of the Cascadia margin. An undissociated section of such a layer was recovered at the base of a gravity core (i.e. at a sediment depth of 120 cm) ...
Now showing items 10209-10228 of 21934