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Minerals 2017, 7(7), 117; https://doi.org/10.3390/min7070117

Re-Equilibration Processes in Fluid Inclusion Assemblages

Resource Mineralogy, Department of Applied Geological Sciences and Geophysics, Montanuniversity Leoben, 8700 Leoben, Austria
Received: 16 June 2017 / Revised: 4 July 2017 / Accepted: 5 July 2017 / Published: 7 July 2017
(This article belongs to the Special Issue Fluid Inclusions: Study Methods, Applications and Case Histories)
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Abstract

Post-entrapment modifications reduce the reliability of fluid inclusions to determine trapping conditions in rock. Processes that may modify fluid inclusion properties are experimentally identified in this study using synthetic fluid inclusions in quartz with a well-defined composition and density. Modifications are characterized with microthermometry (homogenization and dissolution temperatures) and Raman-spectroscopy in binary fluid systems H2O-D2O and H2O-NaCl. Three distinct processes were identified in this study: (1) diffusion of H2O and D2O; (2) crystal-recovery, expulsion of H2O and accumulation of quartz in inclusions (preferential H2O loss); (3) irreversible total volume increase at the α-β quartz transition. Diffusion is caused by H2O fugacity gradients and can be modelled according to classical diffusion models. The variability of re-equilibrated properties in fluid inclusion assemblages depends on time, temperature, diffusion distance and the size of fluid inclusions. Negative pressure gradients (internal under-pressure) induce the crystal-recovery process, in which H2O is preferentially extracted from inclusions that simultaneously shrink by the inward growth of quartz. This process reduces the H2O concentration and increases the fluid density by total volume loss. Temperature and time are also controlling factors of this process, which is able to transport H2O against fugacity gradients. View Full-Text
Keywords: fluid inclusions; experiments; H2O-D2O mixtures; H2O-NaCl mixtures; re-equilibration; diffusion; volume modifications fluid inclusions; experiments; H2O-D2O mixtures; H2O-NaCl mixtures; re-equilibration; diffusion; volume modifications
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bakker, R.J. Re-Equilibration Processes in Fluid Inclusion Assemblages. Minerals 2017, 7, 117.

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