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Now showing items 16756-16775 of 43490
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(2021)В разрезе докембрия Хараулахского поднятия наименее измененные известняки уктинской и эсэлехской свит имеют минимальные отношение 87Sr/86Sr 0.70673-0.70715. В свою очередь, вышележащие нэлегерская и сиэтачанская свиты ...
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(2003)The observation by Bertram and Cowen [J. Mar. Res. 55 (1997) 577–593] that the strontium content of marine barite decreased from the water column to the deep-sea floor suggested that the Sr/Ba ratio in barite was sensitive ...
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(2006)Past changes in the seasonal distribution of insolation across the Earth's surface are thought to play a critical role in Quaternary climate cycles. In this study we use Sr/Ca and δ18O as geochemical proxies in the skeleton ...
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(2001)We present high resolution Sr/Ca measurements on coccolith-dominated pelagic carbonates of Berriasian-Valanginian, Albian-Santonian, and Campanian-Maastrichtian age from DSDP sites and Tethyan land sections. Carbonate Sr/Ca ...
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(1996)Minor element and isotopic compositions of marine bivalve calcite are frequently used as proxy records of seawater temperature and salinity. Although molluscan calcite is secreted at or near oxygen isotope equilibrium, the ...
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(PANGAEA, 2015-02-23)This dataset contains continuous time series of land surface temperature (LST) at spatial resolution of 300m around the 12 experimental sites of the PAGE21 project (grant agreement number 282700, funded by the EC seventh ...
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(2003)Soil organic matter is known to contain a stable fraction with an old radiocarbon age. Size and stabilisation processes leading to the formation of this old soil carbon pool are still unclear. Our study aims to differentiate ...
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(2004)We have reversed the equilibria Ru+S2=RuS2 and 2FeO+S2=2FeS+O2 under controlled temperature, oxygen fugacity (fO2), and sulfur fugacity (fS2) at 1 atm, to test if the platinum-group mineral laurite (RuS2) has a stability ...
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STABILITY ANALYSIS OF VELOCITY IMAGING OF 2D MULTILAYERED STRUCTURES THROUGH INVERSE REFLECTED RAYS (2006)Inverse reflected rays are used to image velocities and interfaces in 2D multilayered media. Their direction cosines are specified from the receiver and the source, related respectively to the traveltime gradients of the ...
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(1999)The stability field of pargasitic amphibole in a model mantle composition (MORB pyrolite) has been experimentally determined for a fixed water content. A solidus for a pargasite-bearing lherzolite has been defined at ...
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(1999)Continental cratons overlie thick, high-viscosity, thermal and chemical boundary layers, where the chemical boundary layers are less dense than they would be due to thermal effects alone, perhaps because they are depleted ...
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(2002)The stability and solubility of natural arsenopyrite (FeAsS) in pure water and moderately acid to slightly basic aqueous solutions buffered or not with H2 and/or H2S were studied at temperatures from 300 to 450°C and ...
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(2001)We present the first measured set of stability constants for mono- and dioxalato-complexes of yttrium and all rare earths except Pm (Y+REE), Oxβn = [MOxn3-2n] [M3+]-1 [Ox2-]-n(where [ ] = concentrations, M = Y+REE, and ...
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(2001)The strength criterion of rock massifs with several cracks systems is suggested. The effective stresses are calculated as dependences on the loading form and compared with the strength limits with respect to one-axis ...
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(2006)One process for the formation of continental crust is the accretion of arc terranes at continental margins. A longstanding problem with this model is that although the composition of the continental crust is andesitic, the ...
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(2004)This work is aimed at the thermodynamic calculations of arsenopyrite stability in medium- and low-temperature regions based on mineral relationships observed in nature.
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(2006)An analytical method is presented for the calculation of the load carrying capacity of two-dimensional asymmetric rock wedges when the loading on the joint faces is non symmetric, such as the case of an asymmetric wedge ...
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(2003)The solubility of gold has been measured in the system H2O+H2+HCl+NaCl+NaOH at temperatures from 300 to 600°C and pressures from 500 to 1800 bar in order to determine the stability and stoichiometry of chloride complexes ...
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(2000)The low-pressure stability of clinohumite has been investigated in phase-equilibrium experiments on the reaction forsterite + brucite = clinohumite. The reaction was bracketed between 2.45 and 2.84 GPa at 650 °C, extending ...
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(1996)Experiments in the basalt-H2O system at 600–950°C and 0.8–3.0 GPa, demonstrate that breakdown of amphibole represents the final dehydration of subducting oceanic tholeiite at T≥650°C; the dehydration H2O occurs as a free ...
Now showing items 16756-16775 of 43490