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Browsing ELibrary by Title
Now showing items 4106-4125 of 21934
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(2003)Understanding the processes that led to the mineralization of Precambrian metazoan eggs and embryos is essential to informed interpretations of such fossils and their significance in early metazoan evolution. Here we show ...
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(2000)In connection with the discovery of a new type of Pt deposit in low-rank brown coals and black shales, the interaction of Pt-bearing aqueous solutions with fractionated organic matter (asphaltenes and asphaltenic acids) ...
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(2004)The experimentally determined Sr partition coefficients between CaCO 3 and solutions that imitate the water in river mouths are consistent with the available literature data on the Sr partition coefficients for aragonite. ...
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(2004)The effect of crystals and pre-existing gas phases on the dynamic degassing and fragmentation of magmas in a volcanic conduit have been simulated by analogue experiments. A series of decompression experiments of viscous ...
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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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(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 ...
Now showing items 4106-4125 of 21934