NEW DATA ON CS AND RB DISTRIBUTION BETWEEN POTASSIUM FELDSPAR AND ALKALINE FLUID: A STUDY OF THE "TRAPPING EFFECT"
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dc.contributor.author | Tauson V.L. | |
dc.contributor.author | Taroev V.K. | |
dc.contributor.author | Akimov V.V. | |
dc.contributor.author | Gottlicher J. | |
dc.contributor.author | Pentinghaus H. | |
dc.contributor.author | Rocholl A. | |
dc.date.accessioned | 2021-02-20T08:18:57Z | |
dc.date.available | 2021-02-20T08:18:57Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13376827 | |
dc.identifier.citation | Geochemistry International, 2001, 39, 8, 725-731 | |
dc.identifier.issn | 0016-7029 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/25315 | |
dc.description.abstract | The effect of trapping a trace element, i.e., increasing element partitioning to the solid phase due to interaction of its atoms with crystal lattice defects, is an important phenomenon in trace-element behavior in geochemical systems. We have experimentally determined the coefficients of Rb and Cs cocrystallization with K in the K-feldspar-alkaline hydrothermal fluid system at 500°C and 1 kbar using highly sensitive methods with high-resolution for the analysis of solid phases (ICP-MS and ion microprobe). The fluid was sampled with a specially designed technique. Numerical modeling of Rb and Cs capture by K-feldspar crystal dislocation defects was based on real crystal structure data determined from X-ray powder diffraction measurements. Theoretical and experimental results show that, unlike Rb, Cs is accumulated in dislocation defects, and, at a low Cs content in K-feldspar, the Cs partition coefficient significantly increases. An inhomogeneous Cs distribution at a microscopic scale at a generally uniform Rb distribution and some earlier experimental data suggest that a significant amount of Cs in K-feldspar is confined to dislocations, and the trapping effect is important for this element at <~10-4 mol % CsAlSi3O8 in K-feldspar. This tendency to increasing co-crystallization coefficients is also observed at larger CsAlSi3O8 concentrations of >0.4 mol %. New special experiments are needed to estimate the errors caused by the nonisothermal sampling of fluid or using residual liquids for modeling of the high-temperature fluid composition. Such experiments should also demonstrate the applicability of the analytical methods used for studying solid phases with very low trace-element concentrations. | |
dc.title | NEW DATA ON CS AND RB DISTRIBUTION BETWEEN POTASSIUM FELDSPAR AND ALKALINE FLUID: A STUDY OF THE "TRAPPING EFFECT" | |
dc.type | Статья |
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