Permeability variation in crystalline rocks due to low-grade solution phenomena
نویسندگان
چکیده
Abstract. Permeability of crystalline rocks depends on parameters such as density and interconnectivity fractures pores. While in pristine porosity is usually considered to be low, low-grade solution phenomena the formation episyenites occur occasionally may cause a local dramatic increase permeability. These can effective otherwise unaltered result preferential removal certain mineral phases, especially quartz so that porosities correspond spatial distribution previously existing phase if no subsequent mineralization occurs (e.g., Pennacchioni et al., 2016). Using light-optical scanning electron microscopy, X-ray tomography, micro-XRD, well digital image analysis, differences connectivity hence permeability between, for example, quartz-depleted granite, gneiss, schist characterized quantified. We demonstrate do not necessarily high permeabilities an undeformed granodiorite from Central Gneiss unit Tauern Window (Lago di Neves area, Italy), since former aggregates are interconnected due their relatively late crystallization age preservation magmatic fabric; however, case moderate mylonitic deformation, rheologically weak forms layers. Its dissolution results extremely increased Therefore, only content grain size but also distribution, shape alignment minerals crucial rock need carefully investigated when searching final repository highly radioactive waste rocks. Especially shear zones form intrusive bodies, detailed structural analysis beyond exclusion presence required mitigate risk long-lasting nuclear disposal.
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ژورنال
عنوان ژورنال: Safety of nuclear waste disposal
سال: 2021
ISSN: ['2749-4802']
DOI: https://doi.org/10.5194/sand-1-65-2021