The Trace-Component Trapping Effect: Experimental Evidence, Theoretical Interpretation, and Geochemical Applications
Identifieur interne : 000304 ( Istex/Curation ); précédent : 000303; suivant : 000305The Trace-Component Trapping Effect: Experimental Evidence, Theoretical Interpretation, and Geochemical Applications
Auteurs : Vadim S. Urusov [Russie] ; Valentina B. Dudnikova [Russie]Source :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1998.
English descriptors
- KwdEn :
- Acta, Analytical technique, Analytical techniques, Andreev, Beattie, Behaviour, Block boundaries, Carnegie inst, Cationic substituent, Charge compensation, Concentration dependence, Concentration dependences, Content increases, Cosmochim, Crystal chemical properties, Crystallization, Czochralski method, Defect, Defect chemistry, Defect structure, Dudnikova, Electroneutrality, Electroneutrality balance, Elsevier science, Emission spectroscopy, Eqns, Equilibrium constants, Excess charge, Experimental data, Forsterite, Garnet, Garnet peridotite minerals, Geochemical, Geochim, Glass matrix, Harrison, Heterovalent, Heterovalent substitution, Heterovalent substitutions, Heterovalent systems, High density, Higher concentrations, Higher temperatures, Hydrous silicate, Iiyama, Intrinsic defects, Ionic radii, Isovalent, Isovalent substitution, Isovalent substitutions, Kbar, Kirgintsev, Matrix, Matrix crystal, Mysen, Nauk ussr, Neutron activation analysis, Otation measurements, Pairs form, Partition, Partitioning, Partitioning divalent elements, Partitioning studies, Phenocrysts, Planar defects, Point defects, Rare earth element partitioning, Relative density, Reversal experiments, Schottky defects, Silicate, Similar behaviour, Simultaneous solution, Single crystal density, Single crystals, Size parameter, Solid lines, Solid solution, Solid solutions, Substituent, Substituent atoms, Substitution, Total concentrations, Trace element partition, Trace elements, Track autoradiography, Trivalent elements, True equilibrium constants, Tting, Tting eqns, Tting parameters, Urgent need, Urusov.
- Teeft :
- Acta, Analytical technique, Analytical techniques, Andreev, Beattie, Behaviour, Block boundaries, Carnegie inst, Cationic substituent, Charge compensation, Concentration dependence, Concentration dependences, Content increases, Cosmochim, Crystal chemical properties, Crystallization, Czochralski method, Defect, Defect chemistry, Defect structure, Dudnikova, Electroneutrality, Electroneutrality balance, Elsevier science, Emission spectroscopy, Eqns, Equilibrium constants, Excess charge, Experimental data, Forsterite, Garnet, Garnet peridotite minerals, Geochemical, Geochim, Glass matrix, Harrison, Heterovalent, Heterovalent substitution, Heterovalent substitutions, Heterovalent systems, High density, Higher concentrations, Higher temperatures, Hydrous silicate, Iiyama, Intrinsic defects, Ionic radii, Isovalent, Isovalent substitution, Isovalent substitutions, Kbar, Kirgintsev, Matrix, Matrix crystal, Mysen, Nauk ussr, Neutron activation analysis, Otation measurements, Pairs form, Partition, Partitioning, Partitioning divalent elements, Partitioning studies, Phenocrysts, Planar defects, Point defects, Rare earth element partitioning, Relative density, Reversal experiments, Schottky defects, Silicate, Similar behaviour, Simultaneous solution, Single crystal density, Single crystals, Size parameter, Solid lines, Solid solution, Solid solutions, Substituent, Substituent atoms, Substitution, Total concentrations, Trace element partition, Trace elements, Track autoradiography, Trivalent elements, True equilibrium constants, Tting, Tting eqns, Tting parameters, Urgent need, Urusov.
Abstract
Abstract: Experimental data indicating increase of crystal-melt (fluid) partition coefficients in the range of microconcentrations of trace elements are reviewed and analyzed in detail. This concentration dependence of partition coefficients has been referred to as either deviations from Henry’s law or the trace-component trapping effect. A critical review of a variety of models proposed to explain this phenomenon is also given. It is shown that the most reasonable and developed of these models relate changes in trace element partition coefficient at low concentrations to interactions between the trace element ions and metastable lattice defects (i.e., linear and planar defects) at low temperatures or intrinsic point defects of thermal origin at higher temperatures. The mechanism of interaction between trace element substituent atoms and intrinsic defects is considered in detail, with particular consideration given to the creation of pair associates, coupled substitutions, and the influence of other impurities on the trace element dissolution. The models developed are fit to the available experimental data to provide descriptions of the dependence of partition coefficients on composition and to estimate the concentrations and free energies of formation of the intrinsic defects (i.e., vacancies and interstitial atoms) in a matrix crystal. Some probable geochemical applications and manifestations of the trapping effect are discussed. This leads to the conclusion that there is an urgent need for further consideration of the problem.
Url:
DOI: 10.1016/S0016-7037(98)00071-4
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peridotite minerals</term><term>Geochemical</term><term>Geochim</term><term>Glass matrix</term><term>Harrison</term><term>Heterovalent</term><term>Heterovalent substitution</term><term>Heterovalent substitutions</term><term>Heterovalent systems</term><term>High density</term><term>Higher concentrations</term><term>Higher temperatures</term><term>Hydrous silicate</term><term>Iiyama</term><term>Intrinsic defects</term><term>Ionic radii</term><term>Isovalent</term><term>Isovalent substitution</term><term>Isovalent substitutions</term><term>Kbar</term><term>Kirgintsev</term><term>Matrix</term><term>Matrix crystal</term><term>Mysen</term><term>Nauk ussr</term><term>Neutron activation analysis</term><term>Otation measurements</term><term>Pairs form</term><term>Partition</term><term>Partitioning</term><term>Partitioning divalent elements</term><term>Partitioning studies</term><term>Phenocrysts</term><term>Planar defects</term><term>Point defects</term><term>Rare earth element 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inst</term><term>Cationic substituent</term><term>Charge compensation</term><term>Concentration dependence</term><term>Concentration dependences</term><term>Content increases</term><term>Cosmochim</term><term>Crystal chemical properties</term><term>Crystallization</term><term>Czochralski method</term><term>Defect</term><term>Defect chemistry</term><term>Defect structure</term><term>Dudnikova</term><term>Electroneutrality</term><term>Electroneutrality balance</term><term>Elsevier science</term><term>Emission spectroscopy</term><term>Eqns</term><term>Equilibrium constants</term><term>Excess charge</term><term>Experimental data</term><term>Forsterite</term><term>Garnet</term><term>Garnet peridotite minerals</term><term>Geochemical</term><term>Geochim</term><term>Glass matrix</term><term>Harrison</term><term>Heterovalent</term><term>Heterovalent substitution</term><term>Heterovalent substitutions</term><term>Heterovalent systems</term><term>High density</term><term>Higher concentrations</term><term>Higher temperatures</term><term>Hydrous silicate</term><term>Iiyama</term><term>Intrinsic defects</term><term>Ionic radii</term><term>Isovalent</term><term>Isovalent substitution</term><term>Isovalent substitutions</term><term>Kbar</term><term>Kirgintsev</term><term>Matrix</term><term>Matrix crystal</term><term>Mysen</term><term>Nauk ussr</term><term>Neutron activation analysis</term><term>Otation measurements</term><term>Pairs form</term><term>Partition</term><term>Partitioning</term><term>Partitioning divalent elements</term><term>Partitioning studies</term><term>Phenocrysts</term><term>Planar defects</term><term>Point defects</term><term>Rare earth element partitioning</term><term>Relative density</term><term>Reversal experiments</term><term>Schottky defects</term><term>Silicate</term><term>Similar behaviour</term><term>Simultaneous solution</term><term>Single crystal density</term><term>Single crystals</term><term>Size parameter</term><term>Solid lines</term><term>Solid solution</term><term>Solid solutions</term><term>Substituent</term><term>Substituent atoms</term><term>Substitution</term><term>Total concentrations</term><term>Trace element partition</term><term>Trace elements</term><term>Track autoradiography</term><term>Trivalent elements</term><term>True equilibrium constants</term><term>Tting</term><term>Tting eqns</term><term>Tting parameters</term><term>Urgent need</term><term>Urusov</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Experimental data indicating increase of crystal-melt (fluid) partition coefficients in the range of microconcentrations of trace elements are reviewed and analyzed in detail. This concentration dependence of partition coefficients has been referred to as either deviations from Henry’s law or the trace-component trapping effect. A critical review of a variety of models proposed to explain this phenomenon is also given. It is shown that the most reasonable and developed of these models relate changes in trace element partition coefficient at low concentrations to interactions between the trace element ions and metastable lattice defects (i.e., linear and planar defects) at low temperatures or intrinsic point defects of thermal origin at higher temperatures. The mechanism of interaction between trace element substituent atoms and intrinsic defects is considered in detail, with particular consideration given to the creation of pair associates, coupled substitutions, and the influence of other impurities on the trace element dissolution. The models developed are fit to the available experimental data to provide descriptions of the dependence of partition coefficients on composition and to estimate the concentrations and free energies of formation of the intrinsic defects (i.e., vacancies and interstitial atoms) in a matrix crystal. Some probable geochemical applications and manifestations of the trapping effect are discussed. This leads to the conclusion that there is an urgent need for further consideration of the problem.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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