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The application of SIMS ion imaging techniques in the experimental study of fluid-mineral interactions

Published online by Cambridge University Press:  05 July 2018

S. C. Elphick ,
C. M. Graham ,
F. D. L. Walker  and
M. B. Holness
S. C. Elphick
Affiliation:
Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW
C. M. Graham
Affiliation:
Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW
F. D. L. Walker
Affiliation:
Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW
M. B. Holness
Affiliation:
Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW
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Abstract

Ion imaging by SIMS (ion microprobe) techniques provides a novel approach to the identification of mechanisms of fluid-mineral interaction during hydrothermal experiments. In scanning ion imaging, the primary ion beam is focussed to a fine spot which is rastered across the polished sample surface, and the secondary ion signal from the mass spectrometer is synchronised with the primary beam. The resistive anode encoder provides a direct ion image of a sample surface illuminated by a defocussed primary beam. The latter system is susceptible to charging artifacts during the imaging of insulating geological materials, and has a lower dynamic range than the scanning ion imaging system.

Application of both systems to the study of fluid–mineral interaction during hydrothermal experiments are reviewed in which fluid or solid phases have been labelled with 18O-enriched isotopic tracers. These include studies of micropermeability and microporosity in feldspars, solid-state diffusion versus solution-reprecipitation, textural equilibration mechanisms, and oxygen isotope exchange in silicate–carbonate systems.

Keywords

ion microprobeion imagingfluid-mineral interactionisotope tracerssolution-reprecipitationoxygen exchange
Type
Research Article
Information
Mineralogical Magazine , Volume 55 , Issue 380 , September 1991 , pp. 347 - 356
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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