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Phase-field modeling of epitaxial growth of polycrystalline quartz veins in hydrothermal experiments

Wendler, F.; Okamoto, A.; Blum, Philipp

Mineral precipitation in an open fracture plays a crucial role in the evolution of fracture permeability in rocks, and the microstructural development and precipitation rates are closely linked to fluid composition, the kind of host rock as well as temperature and pressure. In this study, we develop a continuum thermodynamic model to understand polycrystalline growth of quartz aggregates from the rock surface. The adapted multiphase-field model takes into consideration both the absolute growth rate as a function of the driving force of the reaction (free energy differences between solid and liquid phases), and the equilibrium crystal shape (Wulff shape). In addition, we realize the anisotropic shape of the quartz crystal by introducing relative growth rates of the facets. The missing parameters of the model, including surface energy and relative growth rates, are determined by detailed analysis of the crystal shapes and crystallographic orientation of polycrystalline quartz aggregates in veins synthesized in previous hydrothermal experiments. The growth simulations were carried out for a single crystal and for grain aggregates from a rock surface. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000057615
Veröffentlicht am 21.12.2018
DOI: 10.1111/gfl.12144
Zitationen: 16
Web of Science
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1468-8115
KITopen-ID: 1000057615
HGF-Programm 35.14.01 (POF III, LK 01)
Effiziente Nutzung geothermisch. Energie
Erschienen in Geofluids
Band 16
Heft 2
Seiten 211-230
Schlagwörter numerical modeling, phase-field model, polycrystalline growth, quartz growth, quartz vein
Nachgewiesen in Scopus
Web of Science
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