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Browsing ELibrary by Title
Now showing items 5044-5063 of 21821
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(1985)Geophysical data indicate that beneath Late Cenozoic continental rift zones there are asthenospheric upwellings with their upper surfaces reaching the Moho at depths of 30–40 km. Under neighboring stable regions the ...
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(2003)A new investigation of the thermal conductivity of the drill cores from the research drill hole Nördlingen 1973 in the Ries impact structure was conducted. The 1206 m deep drill hole penetrated 331 m of post-impact lake ...
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(2003)There are two well-founded hypotheses of the Ninety-East and Chagos-Laccadive Ridges genesis: the hypothesis of the extrusive source disposed at a junction of the spreading axis with transform fault and the hot spot ...
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(1987)A comparison of the probability density distribution of the heat flux with the distribution of dimensions of blocks shows that the two are qualitatively identical. Two characteristic peaks are identified on these distributions: ...
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(1985)Tectonic, magmatic and metamorphic processes combine into endogenous regimes. There is direct correlation between the degree of excitation of endogenous regimes and observed heat flow. There are grounds to suppose that all ...
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(1990)Experiments were carried out on primitive natural lherzolitic compositions from 10 to 60 kb and 900 to 1400-degrees-C. Mineral compositions were reversed by using mixes of finely ground (< 20-mu-m) minerals from natural ...
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(1990)On the basis of experiments presented in Part I of this series, most of the published thermobarometers relevant to four-phase peridotites are tested here for their ability to reproduce experimental conditions. They were ...
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(2004)Geothermometry of eclogites and other high pressure (HP)/ultrahigh-pressure (UHP) rocks has been a challenge, due to severe problems related to the reliability of the garnet–clinopyroxene Fe–Mg exchange thermometer to ...
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(2001)A simple extension of geothermobarometric technique is developed, from the usual case of assumed equilibrium among all minerals, to layered coronas with gradients of chemical potential. For reactions among end-members in ...
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(1982)The reaction Hb+Zo(Ep)+H2O+CO2⇌Pl+ Chl+Cc+Q was studied under hydrothermal conditions at P total=2, 4, 6 and 8 kb at Xco2=0.1. The continious transition from tremolite (actinolite) to Al-rich hornblende was fixed along the ...
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(1997)By using ICP-MS, we have measured the concentrations and isotopic abundances of Ge in the following samples: (1) the iron meteorites Camp Verde, Toluca, Picacho, and Canyon Diablo; (2) Canyon Diablo spheroids; and (3) oxide ...
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(2001)Earth, Venus, and Mars all exhibit populations of giant (radiating, linear, and arcuate) mafic dike swarms hundreds to >2000 km in length. On Earth the dikes are exposed by erosion, while on Venus and Mars their presence ...
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(2005)We present a model to assess the viability of the creation of volcanic eruptions of up to flood-basalt size from a giant impactor striking a relatively thin lithosphere. A 300-km-radius crater in 75-km-thick lithosphere ...
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(1995)On Earth, giant radiating dyke swarms are usually preserved as fan-shaped fragments which have been dismembered from their original configuration by subsequent plate tectonic rifting events. Analysis of the largest fragments ...
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(2003)Resources of giant silver ore deposits found in northeastern Russia are comparable to those of the world's largest deposits such as Potosi (Bolivia) and Guanohuato (Mexico). One of them, e.g., the Dukat deposit, is confined ...
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(1998)New thermodynamic data are presented for the mixing of calcite (CaCO3(s)) and rhodochrosite (MnCO3(s)) to form CaxMn1-xCO3(s) solutions. A reversible equilibrium was achieved between the aqueous solution and the metastable ...
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(1997)The Gibbs free energies of formation of RuO2, OsO2 and IrO2 have been determined by measuring the chemical potentials of oxygen (μO2) defined by the reactions M + O2 = MO2, where M = Ru, Os. or Ir, using an electrochemical ...
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(1996)The solubility of a natural hydrothermal kaolinite was measured in buffered alkaline solutions at temperatures ranging from 60 to 170°C. At temperatures below 110°C equilibrium was obtained from undersaturation, while above ...
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(1999)New experimental data for gibbsite growth on powdered kaolinite and single crystal muscovite and published data for gibbsite growth on gibbsite powders at 80°C in pH3 solutions show that all growth rates obey the same ...
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(2001)A Givetian rhynchonellid assemblage from the Chernaya Cuba Horizon in southwestern Novaya Zemlya is described. The new species: Eurycolporhynchus krasinensis, Septalaria tisengausensis, and Septalaria alferovi are described ...
Now showing items 5044-5063 of 21821