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Browsing ELibrary by Title
Now showing items 9292-9311 of 20047
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(2003)Liesegang bands with apparent offset along fractures are common in some calcisiltite beds. Thin sections show, however, that primary laminations are not offset along the fractures. Following the development of fracture ...
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(2002)A new genus, Pseudorhabdomeson, with its type species, Ps. polygonium sp. nov., from the Kasimovian of the Russian Platform is described. Its axial zooecium has a distinctive form of a prismatic tube with a polygonal cross ...
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(2000)Pseudosinhalite, Mg2Al3[O|OH|(BO4)2] and chondrodite, Mg5[(F,OH)2|(SiO4)2] are shown to be isostructural. Compositional and crystallographic relationships between members of the forsterite-clinohumite polysomatic series ...
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(1998)After its initial synthesis as the new compound Mg2Al3B2O9(OH) (Daniels et al. 1997) pseudosinhalite has now been discovered as a new mineral. It occurs, together with hydrotalcite, as a replacement product of sinhalite, ...
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(2002)The Cenozoic intracontinental Teletsk basin in the Central Asian Altai Mountains is composed of a complexly structured northern and a more simple southern sub-basin. These sub-basins formed in two distinct kinematic stages ...
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(2002)Combined structural, compositional and osmium-isotope data on selected Pt–Fe nuggets from economically important placer deposits closely linked to clinopyroxenite–dunite massifs of the Siberian Platform (Kondyor, Inagli, ...
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(2003)A specific assemblage of precious-metal minerals including majakite, Pb stannopalladinite, Pt-Pd tetraauricupride, plumbopalladinite, Sn plumbopalladinite, polarite, tetraferroplatinum, kuestelite, and electrum is described ...
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(2004)The Pt-Re-Os isotopic and elemental systematics of 13 group IIAB and 23 group IIIAB iron meteorites are examined. As has been noted previously for iron meteorite groups and experimental systems, solid metal-liquid metal ...
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(2002)Combined structural, compositional and osmium-isotope data on selected Pt–Fe nuggets from economically important placer deposits closely linked to clinopyroxenite–dunite massifs of the Siberian Platform (Kondyor, Inagli, ...
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(2003)The endogenic activation of the Russian Platform governed by pulsating mantle processes of different degrees of intensity along the lateral direction were accompanied by block movements of the Earth's crust and magmatism.
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(2001)Self-diffusion coefficients of water molecules (H2O) in Na-montmorillonite gel were measured as a function of water fraction (54.8 to 100 wt%) and temperature (30.4 to 60.0 °C) using proton nuclear magnetic resonance (NMR). ...
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(2004)The formation mechanisms of tremolite in a time series of hydrothermal experiments at 850 °C and 6.1 kbar were studied using transmission electron microscopy (TEM), analytical TEM, and X- ray diffraction. The starting ...
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(2004)Oxidation of pyrite in aqueous solutions in contact with air (oxygen 20%) was studied at 25°C using short-term batch experiments. Fe2+ and SO42− were the only dissolved Fe and S species detected in these solutions. After ...
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(1996)Pyrite formation has been investigated at 70°C and pH 6-8 by aging precipitated, disordered mackinawite, Fe9S8, and greigite, Fe3S4, in solutions containing aqueous H2S, HS-, S2-x, S2O2-3, SO2-3, colloidal elemental sulfur, ...
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(1999)Trace element composition and morphology of pyrite were analyzed in the metosomatic rocks of the modern Baransky (Iturup I.) and Pauzhetka (South Kamchatka) high-temperature hydrothermal systems. Pyrite occurs as disseminated ...
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(2004)The rate of pyrite oxidation in moist air was determined by measuring, over time, the pressure difference between a sealed chamber containing pyrite plus oxygen and a control. The experiments carried out at 25°C, 96.7% ...
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(2003)The oxidation of pyrite to release ferrous iron and sulfate ions to solution involves the transfer of seven electrons from each sulfur atom in the mineral to an aqueous oxidant. Because only one or, at most, two electrons ...
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(2004)Pyritization in late Pleistocene sediments of the Black Sea is driven by sulfide formed during anaerobic methane oxidation. A sulfidization front is formed by the opposing gradients of sulfide and dissolved iron. The ...
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(2000)Lahars are often produced as pyroclastic flows move over snow. This phenomenon involves a complicated interplay of mechanical and thermal processes that need to be separated to get at the fundamental physics. The thermal ...
Now showing items 9292-9311 of 20047