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Browsing ELibrary by Title
Now showing items 12286-12305 of 21936
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(2004)The self-potential (SP) method is a fast and cheap reconnaissance tool sensitive to ground water flow in unconfined aquifers. A model based on the use of Green's functions for the coupled hydroelectric problem yields an ...
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(2002)An electrical field is produced in response to groundwater flow in porous materials such as soils and permeable rocks. This electrical field is due to the relative displacement between the charged mineral grains and the ...
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(1998)Long-term evolution of the Earth's water cycle is investigated to predict potential variations in the hydrogen stable isotope composition of seawater. Mass balance calculations are used to estimate the δD value of the early ...
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(2003)The solubility of gold has been measured in aqueous solutions at temperatures between 300 and 600°C and pressures from 500 to 1500 bar to determine the stability and stoichiometry of the hydroxy complexes of gold(I) in ...
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(1999)The solubility of chalcocite has been measured over the pH range 4 - 11.5 in aqueous sulphide solutions in order to determine the stoichiometry and stability of the Cu(I) hydrosulphide/sulphide complexes at room temperature. ...
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(1986)The hydrothermal leaching of quartz from granite is frequently associated with sodium and/or potassium metasomatism, which promotes important alterations in the primary mineralogy, together with concomitant changes in the ...
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(1995)A series of hydrothermal experiments were performed at temperatures from 150-350°C (500 bars) to assess the effect of temperature on the solubility of F in seawater. Changes in dissolved F were measured along with pH and ...
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(2003)Complex I-Xe and mineralogical studies have been performed on four heavily-altered Allende fine-grained spinel-rich Ca, Al-rich inclusions (CAIs) and four Allende dark inclusions (DIs) showing various degrees of iron-alkali ...
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(2002)We present new data for iron meteorites that are members of group IAB or are closely related to this large group, and we have also reevaluated some of our earlier data for these irons. In the past it was not possible to ...
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(1999)An author wishing to introduce a new mineral name into the literature, or to redefine, discredit or rename an existing mineral, must obtain prior approval of the IMA Commission on New Minerals and Mineral Names. This paper ...
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(1997)The distribution of Fe, Ni, Co, P, Ge, W, Mo, and O between molten silicate and liquid metal was determined at pressures and temperatures relevant to core formation (50-80 kb, 2000-2300°C) under both carbon-free and ...
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(2003)A modified covariance function of log hydraulic conductivity, accounting for a finite field size, is derived to assess the impact of finite flow domain size on the statistical properties of the flow system in heterogeneous ...
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(2000)Sedimentary records from the southwestern Kara Sea were investigated to better understand the extent of the last glaciation on the Eurasian Arctic shelf, sea-level change, and history of the Ob' and Yenisey river discharge. ...
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(2003)The early evolution of karst aquifers depends on a manifold of initial and boundary conditions such as geological setting, hydrologic properties of the initial aquifer, and petrologic properties of the rock. When all water ...
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(2003)Volcanic gases such as SO2, H2S, HCl and COS emitted during explosive eruptions significantly affect atmospheric chemistry and therefore the Earth's climate. We have evaluated the dependence of volcanic gas emission into ...
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(1999)Although clay mineral reduction is thought to occur primarily as a result of the activity of indigenous microorganisms in soil, most research has focused on chemical mechanisms of Fe reduction within clay minerals. Here ...
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(2004)This paper is a personal (and, in many ways, incomplete) view of the past development of impact geology and of the newly recognized importance of impact events in terrestrial geological history. It also identifies some ...
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(2001)Particle-mediated removal processes of U isotopes were investigated during spring flood discharge in the low-salinity zone (LSZ, up to 3 practical salinity units [psu]) of a stable estuary. A shipboard ultrafiltration ...
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(2003)Pure quartz arenites are especially characteristic of lower Paleozoic and Proterozoic strata deposited in nonorogenic settings. A century-long debate over the origin of these remarkably pure sandstones has remained unresolved, ...
Now showing items 12286-12305 of 21936