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Now showing items 12584-12603 of 39124
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(1985)Pyrolysis experiments were carried out on Monterey formation kerogen and bitumen and Green River formation kerogen (Type II and I, respectively), in the presence and absence of montmorillonite, illite and calcite at 200 ...
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(2004)The dissolution of siderite (FeCO 3) and rhodochrosite (MnCO 3) under oxic and anoxic conditions is investigated at 298 K. The anoxic dissolution rate of siderite is 10 -8.65 mol m -2 s -1 for 5.5 < pH < 12 and increases ...
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(1989)A general tectonic uplift ranging from 50 to 400 m is characteristic of the Recent development of the West Siberian plate, and could not fail to affect the development of oil and gas fields there. The authors have derived ...
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(2003)Ophiolites are mafic and ultramafic rock assemblages occurring in mountain belts, and they are commonly found in mélanges. Their association with deep-sea sediments suggests that they represent fragments of raised ocean ...
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(2001)During the 1929 activity of Hokkaido-Komagatake volcano, the Plinian eruption of a phenocryst-rich andesite was preceded by a small eruption of more mafic magma formed by magma mixing. A similar eruption sequence has been ...
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(1987)The authors report on a more thorough study and test of the conclusion that the nature and concentration of MG2+, K+ and Li cations in chloride solutions affect the sorption of Cu(II) by birnessite (7-angstrom MnO2). To ...
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(1989)Following its conversion from Eu3+ to Eu2+ under reducing conditions that result when an excess of organic matter is present, europium migrates in sedimentary rock at rates higher than the other rare earth elements. It ...
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(1988)Microorganisms are effective geochemical agents by virtue of their greater metabolic diversity, and thus their greater biochemical versatility, than plants and animals. The involvement of microorganisms in the solution and ...
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(2003)Correlation and synthesis of published and new structural, paleomagnetic, geochronological, and paleogeographic data from the Altai-Sayan and East Kazakhstan orogenic areas in Central Asia show an important role of strike-slip ...
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(2001)Ultrapure quartz samples from deposits of the Netherpolar Urals were studied by the EPR technique. Almost all samples contain an impurity of high-temperature beta-quartz, which is not related to the thermal conditions of ...
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ROLE OF THE BACKSTOP-TO-COVER THICKNESS RATIO ON VERGENCE PARTITIONING IN EXPERIMENTAL THRUST WEDGES (2001)The ratio between the thickness of the sedimentary sequences offscraped from the subducting plate (H c ) and the average thickness of the backstop (H b ) is expected to significantly influence vergence partitioning in ...
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(1987)In microbiological generation, bacteria can play a dual role: producing a catalytic effect that promotes the oxidation of manganese and thus converts it to insoluble form (heterotrophic bacteria), or accumulating iron in ...
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(2004)The energy of interface formation is an important parameter that controls the evolution of magmatic systems. The energy factor plays a critical role during phase transitions at the beginning of crystallization, melting, ...
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(2004)An example of fluorite from the Voznesenka Ore District was used to demonstrate the importance of mineralogical studies for interpreting the results of an isotopic research conducted to reveal the age relations between the ...
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(2002)We report experiments in basalt oversaturated with water to duplicate the nodular ore textures of podiform chromitite ores. In immiscible basalt–water systems saturated with olivine and chromite, olivine will reside in the ...
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(2002)Field measurements of the resuspension of medium/coarse sand by orthogonal wave-currents in approximately 20 m water depth are presented and discussed. Velocity squared-suspended sediment cospectra indicate resuspension ...
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(1999)In order to investigate the effects of melt movement on material transport, dissolution and crystal growth in partially molten rock systems, a new apparatus was designed to move partial melt. Spherical specimens with low ...
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(2005)Room-temperature magnetic techniques are rapidly becoming an important tool for the discrimination and quantification of minerals in a broad range of geological, environmental and extraterrestrial materials. The utility ...
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Московский государственный университет им. М. В. Ломоносова», 2011)The comparison of two models of root water uptake in vadoze zone with different root distribution functions for groundwater infiltration recharge estimation was considered. On the base of transpiration process analysis and ...
Now showing items 12584-12603 of 39124