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Browsing Геология России by Title
Now showing items 5120-5139 of 39126
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(2006)Measurable uranium (U) is found in metal sulfide liquids in equilibrium with molten silicate at conditions appropriate for a planetary magma ocean: 1-10 GPa, 1750-2100 °C, 0-28 wt% S, and fO2 2 log units below IW. However, ...
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(1995)Reports of percent level concentrations of normally lithophile elements such as Zr, Nb, and Ta in some refractory noble metal nuggets in CAIs raise important questions about the redox state of the early solar nebula. ...
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(1995)The highly siderophile elements (HSE's: Ru, Rh, Pd, Re, Os, Ir, Pt and Au) and those elements with distribution coefficients between Fe-rich metal and silicate phases which exceed 10⁴. The large magnitude of these distribution ...
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(1992)Mare volcanics consist of basalts and picritic pyroclastic glasses spanning a wide range of TiO2 concentration. The more primitive low-Ti basalts and picritic glasses have olivine alone on their lowpressure liquidi. Most ...
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(1988)Experimental study of natural melilite nephelinite lavas of intermediate K/Na ratio at low pressure (fo2 ∼ reveals the presence of a peritectic 'point' of distributary type (∼1090°C) for liquids saturated with leucite, ...
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(1995)Experiments on rock materials and volatile components provide an array of phase equilibrium boundaries, giving the depth-temperature framework for the phase transitions experienced by rock masses as they move up or down ...
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(1989)Experiments at 15 kb in the tonalite-peridotite-H2O system provide information on some of the phase equilibrium factors that may influence reaction and assimilation processes between quartznormative magmas and ultramafic ...
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(2004)Experimental observations are reported of weakening of sediment-like aggregates by addition of hard particles. Sieved mixtures of calcite and halite grains are experimentally compacted in drained pressure cells in the ...
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(2003)Reliability checks in Thellier-type experiments usually focus on the detection of chemical alteration of the magnetic mineral component or the formation of new magnetic phases during the heating process. However, a major ...
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(1988)Pseudomorphism of diopside grains was effected by immersing mineral grains of 1-2 mm diameter in 1 N Ni chloride solutions at 1 kbar and 200-680°C. It appears that both infiltration and diffusion-type replacement occur ...
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(2000)We have conducted a series of experiments on the solubility of metallic osmium and palladium in supercritical aqueous KCl fluids in which pH was buffered by the assemblage K-feldspar-quartz-muscovite and oxygen fugacity ...
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(2002)Hyperpycnal flows may be important mechanisms for transporting particles from continents to oceans given their frequency of generation at many modern river mouths. Their deposits are probably very common in the rock record, ...
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(1989)Reactions between hornblende-plagioclase amphibolite and acidic and alkaline B-bearing aqueous fluids have been investigated by experiments at 475–600 C and 200 MPa. At 600 C, hornblende+calcic plagioclase react to form ...
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(2004)Barred olivine (BO) chondrule texture with olivine rim was successfully reproduced by cooling experiments under evacuated conditions for an FeO-rich, alkali-free, low liquidus (1215° C), analog chondrule composition. The ...
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(1986)Single-phase 2M1 muscovite-paragonite crystalline solutions in the range 0?00–0?10 and 0?70–1?00 Xms have been synthesized by hydrothermal treatment of gels of appropriate compositions at 600–700°C, and 7 to 18 kb PH2O. ...
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(1999)In recent years, apparently shock-induced and, thus, impact-characteristic microdeformations, in the form of planar microdeformation features and so-called strawberry (granular) texture, have been observed in zircons in ...
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(1999)A series of shock-recovery experiments were carried out on the Murchison CM carbonaceous chondrite by using a single-stage propellant gun. The Murchison samples were shocked in nine experiments at peak pressures from 4 to ...
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(2002)Partition coefficients (DBemineral/melt) for beryllium between hydrous granitic melt and alkali feldspars, plagioclase feldspars, quartz, dark mica, and white mica were determined by experiment at 200 MPa H2O as a function ...
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(1995)The purpose of this work is to determine both the gas and oil potential of Type II and Type III organic matter in open and closed systems. As it is not possible to measure directly the gas generated at various depths from ...
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EXPERIMENTAL SIMULATION OF SANDSTONE INTERACTION WITH NA-BEARING ALKALIC SOLUTIONS IN A FLOW REGIME (2004)An improved filtration set-up has been designed for the experimental simulation of solution-rock interaction in a flow regime within a wide range of temperature (20-300°C), pressure (1-100 MPa), and solution pH (2-14). The ...
Now showing items 5120-5139 of 39126