Articles | Volume 10, issue 1
Research article
04 Feb 2019
Research article |  | 04 Feb 2019

Granite microporosity changes due to fracturing and alteration: secondary mineral phases as proxies for porosity and permeability estimation

Martin Staněk and Yves Géraud

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Cited articles

Banfield, J. F. and Eggleton, R. A.: Analytical Transmission Electron Microscope Studies of Plagioclase, Muscovite, and K-Feldspar Weathering, Clays Clay Miner., 38, 77–89, 1990. 
Bankwitz, P., Bankwitz, E., Thomas, R., Wemmer, K., and Kämpf, H.: Age and depth evidence for pre-exhumation joints in granite plutons: fracturing during the early cooling stage of felsic rock, Geol. Soc. Lond. Spec. Publ., 231, 25–47,, 2004. 
Bense, V. F., Gleeson, T., Loveless, S. E., Bour, O., and Scibek, J.: Fault zone hydrogeology, Earth-Sci. Rev., 127, 171–192,, 2013. 
Benson, P. M., Meredith, P. G., and Schubnel, A.: Role of void space geometry in permeability evolution in crustal rocks at elevated pressure, J. Geophys. Res.-Solid Earth, 111, B12203,, 2006. 
Bernabé, Y., Mok, U., and Evans, B.: Permeability-porosity relationships in rocks subjected to various evolution processes, Pure Appl. Geophys., 160, 937–960, 2003. 
Short summary
Granite is suitable to host geothermal wells or disposals of hazardous waste and in these cases the rock porosity and permeability are critical. Our detailed porosity and permeability data on variously deformed Lipnice granite yield a span of 5 orders of magnitude in permeability between the least and the most deformed facies. To facilitate the estimation of porosity and permeability in similar settings, we provide optical and chemical data on the characteristic minerals of each facies.