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Browsing ELibrary by Title
Now showing items 4064-4083 of 21768
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(1995)We have performed melting experiments between 1170-1325°C and at an oxygen fugacity of IW-1 on the ordinary chondrites Lost City (H) and St. Severin (LL) in order to investigate the origin of diogenites and their possible ...
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(1987)Analysis of the very limited available information on natural parageneses shows that magnetite associated with sulfide ore is low in titanium, as well as in vanadium, relative to the accessory ores. The nickel content of ...
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(2003)The trace-element signature that cordierite (Crd) imparts to silicic magmas was evaluated by experiment using metapelite mineral mixtures to produce cordierite-bearing peraluminous granitic melts at 200 MPa (PH2O), from ...
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(2000)Partition coefficients of the rare earth elements (REE) and the high field strength elements (HFSE: Ti, Zr, Hf, Nb, Ta) among clinopyroxenes, garnets, and andesitic to granodioritic melts were experimentally determined at ...
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(2002)In this study, phlogopite synthesis experiments were carried out at 800 °C and at 1000 and 2000 MPa for low concentrations of Rb (XRb=Rb/(Rb+K)<0.1) in a concentrated (K,Rb)Cl brine+(Rb,K)Cl salt (XbulkH2O=0.3). For each ...
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(2004)Technetium isotopes 97Tc, 98Tc and 99Tc decay to 97Mo, 98Ru and 99Ru, with half-lives of 2.6 My, 4.1 My, and 0.21 My respectively. If there were early solar system processes that resulted in significant fractionation of ...
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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. ...
Now showing items 4064-4083 of 21768