Istituto Nazionale di Geofisica e Vulcanologia ingv DI TORO Giulio [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] DI TORO Giulio [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0002-6618-3474#2281 2018-01-01T00:00:00 2022-03-22T00:00:00 terremoti Frictional and microanalytical data of basalts sheared with pressurized H2O- and CO2- rich fluids GFZ Data Services http://www.ingv.it/it/ ingv NAZZARI Manuela [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0001-5926-5773#830 NAZZARI Manuela [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0003-0093-2759#3329 MARZOLI Andrea [University of Padua (UniPD), Italy] MARZOLI Andrea [University of Padua (UniPD), Italy] https://orcid.org/0000-0003-3466-2400#3331 YOUBI Nasrrddine [Cadi Ayyad University (UCA), Morocco] YOUBI Nasrrddine [Cadi Ayyad University (UCA), Morocco] INGV INGV ingv_744 GIACOMEL Piercarlo [Sapienza University of Rome (Uni Sapienza), Italy] https://orcid.org/0000-0002-1553-7842#3328 GIACOMEL Piercarlo [Sapienza University of Rome (Uni Sapienza), Italy] https://orcid.org/0000-0002-1377-5812#822 SPAGNUOLO Elena [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] SPAGNUOLO Elena [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] PASSELEGUE François [École polytechnique fédérale de Lausanne (EPFL), Switzerland] PASSELEGUE François [École polytechnique fédérale de Lausanne (EPFL), Switzerland] https://orcid.org/0000-0002-4217-9817#3330 Here we report the raw data of the friction experiments performed on basalt-built faults pressurized with de-ionized H2O, pure CO2, pure Ar, and H2O+CO2 mixtures, respectively (Dataset_friction_basalts.zip). The experiments were designed to assess the effects of the fluid chemistry on fault reactivation in faults juxtaposing basalts with different state of hydrothermal alteration. The experiments setup and data are further described in Giacomel et al (2018) to which these data are supplementary material. Laboratory faults were deformed at a constant normal stress over the range from 10 to 20 MPa, at a shear stress of 5 MPa and a starting fluid pressure from 0.5 to 5 MPa. Fluid pressure was increased stepwise of 0.1 MPa/100 s up to induce macroscopic frictional instability, i.e. the equivalent to a main shock in nature. Our mechanical data point to the paucity of any significant chemical weakening due to fluid-rock interation, regardless of the composition of the injected fluid and the degree of hydrothermal alteration of basalts. Moreover, microRaman investigation evidenced a few carbonate patches at the end of the tests performed in H2O+CO2 mixtures (Dataset_raman_calcite_s1018.txt and Dataset_raman_dolomite_s1018.txt). 10.5880/FIDGEO.2018.013 Science et technologie Wissenschaft und Technologie Ciencia y tecnología Science and technology Scienza e tecnologia GFZ Data Services N/A