Articles | Volume 10, issue 3
Solid Earth, 10, 809–838, 2019
https://doi.org/10.5194/se-10-809-2019
Solid Earth, 10, 809–838, 2019
https://doi.org/10.5194/se-10-809-2019
Research article
13 Jun 2019
Research article | 13 Jun 2019

Fluid-mediated, brittle–ductile deformation at seismogenic depth – Part 1: Fluid record and deformation history of fault veins in a nuclear waste repository (Olkiluoto Island, Finland)

Barbara Marchesini et al.

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Short summary
We documented the role of fluids in the initial embrittlement of the Svecofennian basement and subsequent strain localization and fault evolution at the brittle–ductile transition zone. We studied the fault rocks of a deeply exhumed fault system characterized by mixed brittle–ductile deformation. Results from fluid inclusions, mineral chemistry, and geothermometry of synkinematic minerals document the ingress of distinct fluid batches and fluid pressure oscillations.