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Browsing ELibrary by Title
Now showing items 12062-12081 of 21768
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(1999)Estimates of effective elastic thickness (Te), a measure of the strength of the plate, have shown that older and cool cratonic regions are characterised by a stronger lithosphere (higher Te values) than areas which have ...
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(2001)The strong negative correlation between the temperatures and melt H2O contents of granitoid magmas implies that the crustal melting reactions that produced the magmas were strongly buffered, with T and aH2O co-varying ...
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(2002)Fluid-absent melting experiments on a zoisite- and phengite-bearing eclogite (omphacite, garnet, quartz, kyanite, zoisite, phengite and rutile) were performed to constrain the melting relations of these hydrous phases in ...
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(1998)The response of continental weathering rates to changing climate and atmospheric PCO2 is of considerable importance both to the interpretation of the geological sedimentary record and to predictions of the effects of future ...
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(1998)Fundamental to the global carbon cycle over geologic time scales is the control of atmospheric CO2 by aluminosilicate weathering. Much of the information on the rates of this process comes from rivers in the tropics and ...
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(1999)The conventional view of the climatic influence on weathering is that weathering rates are strongly temperature-dependent due to the near-exponential relationship (Clausius-Clapeyron) between temperature and the saturation ...
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(2004)Experiments were conducted on gibbsite to determine whether oxygen-isotope exchange rates at hydroxyl bridges (μ2-OH) on the basal sheet exhibit similar reactivity trends as in large aluminum polyoxocations, for which ...
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(1994)We combine eigen analysis and parameter estimation techniques for a newly constituted, more versatile fold test. The method is automatic, requiring no assumptions about the polarity or distribution of data, and gives ...
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(1999)Four different prediction techniques were used at the Institute of Volcanology, Far East Division, Russian Academy of Sciences, to make successful long-term and intermediate-term forecasts of the December 5, 1997, magnitude ...
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(2002)The precipitation of kaolinite in reservoir sandstones is a relatively early diagenetic reaction, which depends on the initial proportions of mica and feldspar varieties in the sand, and on the nature and flow rate of the ...
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(2004)Experiments were conducted under canonical nebular conditions to see whether the chemical compositions of the various chondrule types can be derived from a single CI-like starting material by open-system melting and ...
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(2003)The evolution of columnar fiber texture was studied in wollastonite reaction rims synthesized by the reaction calcite + quartz=wollastonite + CO2. Experiments were performed at 850 to 950 °C at 100 MPa in dry CO2 and were ...
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(1998)High-grade ignimbrites are thought to be deposited by pyroclastic flows at temperatures exceeding minimum welding temperature or even solidus temperature. Corresponding pyroclastic-flow particles range from plastic to ...
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(2001)Hydroxyaluminosilicates (HAS) are critical intermediates in the biogeochemical cycles of alumi-nium and silicon. To understand the extent of their role in controlling the solubility of Al in soil and surface waters, we ...
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(2004)We propose a model of high-temperature formation of platinum-group element (PGE) alloys from base–metal sulfides subjected to decreasing sulfur fugacity (fS2). For this purpose we experimentally investigated the effect of ...
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(2001)Wark-Lovering rims of six calcium-aluminum-rich inclusions (CAIs) representing the main CAI types and groups in Allende, Efremovka and Vigarano were microsurgically separated and analysed by neutron activation analysis ...
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(2000)The stability constants of the fluoride complexes of scandium are much higher than those of most other elements; in particular, with respect to the REE, these complexes are in general much more stable than it would be ...
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(2003)In this paper we present a new model for the formation of shatter cones. The model follows earlier suggestions that shatter cones are initiated by heterogeneities in the rock, but does not require the participation of an ...
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(2003)The aqueous phase interaction of divalent Sr with silicate-containing solutions was studied over a range of pH values, dissolved silica, and Sr concentrations, and extending to basic solution (0.2 M NaOH) at room temperature ...
Now showing items 12062-12081 of 21768