Precambrian fault reactivation revealed by structural and K-Ar geochronological data from the spent nuclear fuel repository in Olkiluoto, southwestern Finland
نویسندگان
چکیده
Integrated structural/geochronological studies help unraveling complex brittle deformation histories. We have analysed the structural geological database of faults from ONKALO™ underground facility for spent nuclear fuel in Olkiluoto southwestern Finland. Based on data eleven representative fault zones, we classify features into four systems, referred to as Fault system I IV. The classification is based their properties and tectonic history, crosscutting relationships, rock mineralogical characterization 3D modelling. Some constraints timing faulting are provided by K-Ar dates synkinematic illite gouge samples. Our results show that bedrock Finland experienced numerous phases between ca. 1.75 0.9 Ga. N-S strike-slip (Fault systems II) formed at mid-crustal levels 1.79–1.75 Ga ago response NW-SE/NNW-SSE compression soon after Svecofennian orogeny. Later E-W striking oblique dextral/normal III) tentatively associated with Gothian orogeny 1.6 ago. These three were reactivated during NE-SW 1.3–1.2 ago, coeval intrusion a regional swarm olivine diabase sills. onset Sveconorwegian 1.1–1.0 resulted formation SE dipping low-angle thrust IV) selective reactivation II III. Overall extension collapse orogen 0.97–0.87 caused localised III research approach, which integral siting process repositories fuel, demonstrates basement repeated since Mesoproterozoic, suggesting future localization likely be also accommodated existing structures rather than new faults.
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ژورنال
عنوان ژورنال: Tectonophysics
سال: 2022
ISSN: ['1879-3266', '0040-1951']
DOI: https://doi.org/10.1016/j.tecto.2022.229208