Results 211 to 220 of about 16,003 (268)
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Geology of Ore Deposits, 2008
Ore formation is considered in the paper. The consideration is based on the topology of chemical elements that was discovered by the authors in 2007 as a result of the study of the Fibonacci distribution of chemical elements. On thoroughly analyzing the physical background of ore formation, we have concluded that spin effects play the leading role in ...
N. A. Shilo, A. V. Drinkov
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Ore formation is considered in the paper. The consideration is based on the topology of chemical elements that was discovered by the authors in 2007 as a result of the study of the Fibonacci distribution of chemical elements. On thoroughly analyzing the physical background of ore formation, we have concluded that spin effects play the leading role in ...
N. A. Shilo, A. V. Drinkov
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On Dioxin Formation in Iron Ore Sintering
Environmental Science & Technology, 2003Iron ore sintering is an important source of "dioxins", polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). This paper reports on attempts to identify materials, conditions, and mechanisms responsible for PCDD/F formation (i) by investigating salient properties of ores (viz., with respect to oxidation, condensation, and chlorination of model
Mariusz K, Cieplik +7 more
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DEFECTS OF ORE FORMATION ANALYSIS
Geology and mineral resources of Siberia, 2021The typification of solid mineral deposits is a leading element in the forecast of mineralization. By analogy with magmatic formations, it is based on the ore formation analysis. However, due to the absence of discrete boundaries between formations, their diagnostics encounters insurmountable difficulties, and the classification becomes dubious and ...
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Moscow University Geology Bulletin, 2008
The physics of the ore formation process is discussed using three parageneses of gold, viz., quartz, carbon, and pyrite, as examples. It is inferred that paragenetic associations in ore deposits are formed on a physical basis under the influence of magnetic fields of nuclides and electrons.
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The physics of the ore formation process is discussed using three parageneses of gold, viz., quartz, carbon, and pyrite, as examples. It is inferred that paragenetic associations in ore deposits are formed on a physical basis under the influence of magnetic fields of nuclides and electrons.
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2002
Indium occurs in different types of ore deposits of all ages, from the presently-forming deposits at modern, actively spreading ridges and fumarole precipitates of active volcanoes to deposits in the Archean volcanic strata of the Abitibi and Murchison greenstone belts of Canada and South Africa, respectively.
Ulrich Schwarz-Schampera +1 more
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Indium occurs in different types of ore deposits of all ages, from the presently-forming deposits at modern, actively spreading ridges and fumarole precipitates of active volcanoes to deposits in the Archean volcanic strata of the Abitibi and Murchison greenstone belts of Canada and South Africa, respectively.
Ulrich Schwarz-Schampera +1 more
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Magnesian-Magnetite Ore Formation
1988Abstract Iron mineralization is widely developed within the Angaro-Vilujsky ore belt [2]. In the Noril’sk region, it is found along the western border of the Tungussky syncline and also within the Noril’sk-Kharayelakh depression. The Angaro-Noril’sk metallogenic zone contains some iron mineralization (as deined by N. V.
B.M. Strunin +2 more
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Regional Metamorphism and Ore Formation
1998Abstract How can stable isotopes and other fluid tracers be used to interpret the formation of ore deposits hosted by regional metamorphic terranes? The central question of metamorphogenic ore formation versus a regional metamorphic overprint must consider two basic constraints, as imposed by mass-balance and ore-metal solubility ...
Christoph A. Heinrich +2 more
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Supergene processes and uranium ore formation in the Ronneburg ore field, Germany
Geology of Ore Deposits, 2012The Ordovician-Lower Carboniferous sequence of slightly metamorphosed gray carbonate-terrigenous rocks contains the Silurian black cherty shales enriched in carbon (6–9%), pyrite (6–7%), and uranium (∼30 ppm). The uranium ore is localized at the pinch-out of areal and linear zones of the Early Permian supergene (exogenic) oxidation of rocks expressed ...
A. V. Bolonin, I. F. Gradovsky
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1988
Abstract Porphyry copper mineralization in the Noril’sk region is an unusual example of the occurrence of this ore type within an ancient platform. Such a spatial setting of these deposits makes one cautious in interpreting the tectonic regime of the boundary portion of the platform, because the majority of porphyry., copper deposits are
B.M. Strunin +2 more
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Abstract Porphyry copper mineralization in the Noril’sk region is an unusual example of the occurrence of this ore type within an ancient platform. Such a spatial setting of these deposits makes one cautious in interpreting the tectonic regime of the boundary portion of the platform, because the majority of porphyry., copper deposits are
B.M. Strunin +2 more
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Volatiles in endogenous ore formation
Trudy Instituta geologii i geohimiiThe paper presents a molecular-chemical model of endogenous ore formation based on the properties of water, sulfur, and mercury. The critical temperature of sulfur is in the area of possible existence of magmatic melts, and the isolines of its saturated vapors pass in the temperature range of postmagmatic and hydrothermal processes.
A.I. Malyshev, L.K. Malysheva
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