ORCID Profile
0000-0002-8073-9280
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Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-3792
Abstract: The equilibration of minerals in the presence of an aqueous fluid phase, with which it is out of equilibrium, has been described in terms of a number of potential mechanisms, specifically mainly either by solid state exchange of elements within the solid phase and the aqueous solution, or by interface-coupled dissolution-precipitation where equilibration is approached by the incremental dissolution of the parent solid and the coupled precipitation of a new product solid (Ruiz-Agudo et al., 2014). The conditions determining the equilibration mechanism can be defined by the specific chemical potential differences at the mineral interface, the kinetics of potential reactions, the solubility of the solid phase in the specific fluid and physical properties such as the mineral: fluid ratio as well as the surface area: fluid ratio, temperature and pressure. We focus on the mechanism of ion exchange in a range of minerals and in most cases ion-exchange in the presence of an aqueous solution occurs by interface-coupled dissolution-precipitation (Putnis and Putnis, 2022).ReferencesPutnis C.V. and Putnis A. 2022. A mechanism of ion exchange by interface-coupled dissolution-precipitation in the presence of an aqueous fluid. J. Crystal Growth, 600, 126840Ruiz-Agudo E., Putnis C.V., Putnis A. 2014. Coupled dissolution and precipitation at mineral-fluid interfaces. Chemical Geology 383, 132-146.
Publisher: Copernicus GmbH
Date: 27-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-2331
Abstract: & & The presence of aqueous fluids is ubiquitous in the Earth& #8217 s crust. Grain boundaries play an important role in enabling fluids to penetrate through the rock system. Their influence in fluid-rock reactions that might lead to relevant processes such as mineral replacements, the formation of new minerals and dissolution of others, element mobilization, variations in rock density, changes in stress distribution, mass transfer, etc., are commonly observed in many rock s les as well as generated and observed in laboratory experiments. As a product of these reactions, porosity and fractures might also be generated and potentially allow the fluid to penetrate even further.& & & & Here we present our first analyses on different rock s les where the fluid-rock interaction has been induced through hydrothermal laboratory experiments using either Carrara Marble or plagioclase s les. The evidence for such interactions having previously occurred in natural rocks has been investigated in a sequence of a granulite rock s les from the Bergen Arcs in Norway. Using light microscopy as well as SEM, EDX and Electron Microprobe analysis we have investigated possible fluid pathways and evidence of fluid-mineral reactions as well as the mechanisms that could explain such processes.& &
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Christine V. Putnis.