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Now showing items 6687-6706 of 42285
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(2001)Rb-Sr and Sm-Nd isotopic systems were investigated in the peralkaline granitoids and comagmatic volcanic rocks, which compose the Northern Mongolia-Transbaikalia Belt (NMTB). The belt extends over more than 2000 km at a ...
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(2006)To obtain reliable age data on the Ni-bearing intrusions of Kamchatka and to support their correlation with similar complexes of northeastern China, we dated them with 40Ar/39Ar and U–Pb methods. For this purpose we selected ...
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(2004)The main objective is the study of the correlation between the electric parameters of high-temperature conductivity of ultramafics pertaining to lithostructural complexes of different rock associations.
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(1987)Former diamond-bearing lherzolite consists of primary (olivine, ortho- and clinopyroxene, plagioclase, pargasite, phlogopite, ceylonite, ilmenite and sulfides) and superimposed (amphibole, calcite, phlogopite, apatite, ...
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(2006)The problem of endogenic carbonification of rocks and related ore mineralization is topical for many reasons. The possibility of accumulation and transfer of various metals with reduced carbon-rich fluids has been proved. ...
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(2006)Overview of works devoted to geochemistry of rare and trace elements in phosphorites has revealed that they cannot concentrate noble metals (Au, Pt, and PGM). This statement is also valid for phosphorites on the ocean ...
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(1989)One important aspect in studying how secondary dispersion halos and trains develop is to investigate the forms in which various chemical elements occur in them. We discuss the results of our study of the forms of gold in ...
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(2004)Groundwater flow in an unconfined aquifer (a porous layer with an open top) can be driven either by hydraulic forces, i.e. the gradient of the water table, or by differences in the density of porewater due to thermal ...
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(PANGAEA, 1987-06-18)
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(2004)The tailing dumps of past years may often be regarded as technogenic deposits. Chemically reactive minerals (magnesium and calcium carbonates, serpentine, and some others) can readily interact in the fine-dispersed state ...
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(1989)One method of increasing the efficiency of the prediction of gold-silver ore occurrences that supplements vertical mineralogical and geochemical zoning is analysis of the forms of occurrence of elements in ores and endogenetic ...
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(1989)In the present paper we consider the mechanism of the processes that will take place when cinnabar reacts with river water. The data obtained from physicochemical modeling indicate that mercury enters the water as a result ...
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(1989)Geochemical prospecting for ore deposits requires the identification and subsequent assessment of ore-generated multicomponent anomalies. For this purpose, the forms of occurrence of indicator elements of ore mineralization ...
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(1989)Rare alkalies are assumed to occur in igneous rocks in three main forms: 1) as isomorphous impurities in rock-forming and accessory minerals, 2) as sorbed components (atomic and molecular dispersion), 3) as submicroscopic ...
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(PANGAEA, 2012-10-25)The results of the analysis of samples of the Northern Dvina River's suspended particulate matter obtained by the sedimentation method from large water volumes in the periods of the spring high water and summer low water ...
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(2000)Surfaces of natural and synthetic forsterite (Fo91 and Fo100) in aqueous solutions at 25°C were investigated using surface titrations in batch and limited residence time reactors, column filtration experiments, electrokinetic ...
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(2000)Directional dissolution along the three crystallographic axes of gem-quality olivine (Fo91), San Carlos, Arizona was studied at pH 1 and pH 2 at 23, 50, 70, and 90°C and 1 atm. The rate constant of dissolution for olivine ...
Now showing items 6687-6706 of 42285