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Mantle metasomatism: The REE story
Geology, 1984Refractory rocks with light REE/heavy REE ratios greater than chondrite are common as xenoliths in basalts and kimberlites and are found in some oceanic peridotite massifs. This has led to the supposition that large parts of the upper mantle have been metasomatically altered by addition of light REE and other hyperfusible constituents.
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Metasomatic zones in metamorphic rocks
Geochimica et Cosmochimica Acta, 1977Abstract Prediction of a unique sequence of metasomatic zones that would develop by intergranular diffusion with local equilibrium is possible only for relatively simple systems, unless extensive thermochemical and kinetic information is available. The complexity of the problem for a given example will depend on what portion of the set of chemical ...
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Alkali-metasomatism and uranium mineralization
2005Alkali-metasomatism is a geological process developing widely in nature in accompany with the multimetallic mineralization that is studied extensively by many geologists. In the aspect of uranium geology, the geologists in the former USSR and China also carry out special research on alkalimetasomatism and uranium metallogenesis, with important results ...
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Computational models of metasomatic processes
Lithos, 1973Abstract It is possible to calculate quantitative models of chemical transfer by metasomatic processes if rock density values are available with chemical analyses. A unique solution for the magnitude and sign of chemical transfer can be obtained only if the volume change or absolute variation in any chemical constituent can be established.
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Anion metasomatic replacement reactions
Economic Geology, 1961Data on the kinetic anion replacement systems calcite-PO 4 (super -3) , calcite-F (super -) , gypsum-CO 3 (super -2) , and gypsum-PO 4 (super -3) are given, along with concomitant Sr (super +2) inclusion into the final product. In a system containing several anions, only the anion forming the least soluble compound with the available cation is ...
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Chemical Transport in Metasomatic Processes
1987Invited Lectures.- 18O/16O Evidence for Fluid-Rock Interaction in the Upper Mantle: Data from Ultramafic Nodules and K-Rich Volcanic Rocks in Italy.- Fluid Transport and Metasomatic Storage in the Mantle.- Metasomatism of the Continental Lithosphere: Simulation of Isotope and Element Abundance Behaviour and Case Studies.- Fluid Inclusions and Pressure ...
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Petrological calculations in metasomatic processes
American Journal of Science, 1953Questions the validity of applying the law of equal volume in calculations of metasomatic changes in bulk composition of silicate rocks and suggests a method for calculating the changes, which is based on the assumption that the number of (Si, Al)O 4 tetrahedra remains constant during processes of regional metamorphism and granitization.
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Thermodynamics of infiltration metasomatism
International Geology Review, 1983openaire +4 more sources