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Now showing items 12504-12523 of 39065
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(2004)Lherzolite samples synthesized from fine-grained powders prepared from a natural xenolith were deformed at P = 300?MPa and 1373 ? T ? 1573?K in a high-resolution gas-medium deformation apparatus. Below and above the solidus ...
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(1995)Numerical simulations of mantle convection with a composite temperature-dependent, Newtonian and non-Newtonian creep law have revealed a transition in the dominant creep mechanism with the increasing vigour of convection. ...
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(1998)High-grade igneous and metamorphic systems which possess a variable percentage of melt, may undergo a transition between crystal-supported and fully fluid behavior. The melt-fraction interval over which this transition ...
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(1996)We consider the rheological behaviour of felsic magma in the zone of partial melting and during subsequent crystallization. We also introduce and combine concepts (mushy zone, percolation theory, granular flow, shear ...
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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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(Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения Российской академии наук, 2017)
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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 ...
Now showing items 12504-12523 of 39065