Deformation-resembling microstructure created by fluid-mediated dissolution–precipitation reactions

Liene Spruzeniece (), Sandra Piazolo and Helen E. Maynard-Casely
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Liene Spruzeniece: ARC Centre of Excellence for Core to Crust Fluid Systems/GEMOC, Macquarie University
Sandra Piazolo: ARC Centre of Excellence for Core to Crust Fluid Systems/GEMOC, Macquarie University
Helen E. Maynard-Casely: Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Deformation microstructures are widely used for reconstructing tectono-metamorphic events recorded in rocks. In crustal settings deformation is often accompanied and/or succeeded by fluid infiltration and dissolution–precipitation reactions. However, the microstructural consequences of dissolution–precipitation in minerals have not been investigated experimentally. Here we conducted experiments where KBr crystals were reacted with a saturated KCl-H2O fluid. The results show that reaction products, formed in the absence of deformation, inherit the general crystallographic orientation from their parents, but also display a development of new microstructures that are typical in deformed minerals, such as apparent bending of crystal lattices and new subgrain domains, separated by low-angle and, in some cases, high-angle boundaries. Our work suggests that fluid-mediated dissolution–precipitation reactions can lead to a development of potentially misleading microstructures. We propose a set of criteria that may help in distinguishing such microstructures from the ones that are created by crystal-plastic deformation.

Date: 2017
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DOI: 10.1038/ncomms14032

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