Data of experimentally deformed saw-cut Carrara marble across the Brittle-Ductile Transition

Description

The data set contains original axial displacement and internal force data and corrected stress-strain data for all 17 saw-cut Carrara marble, which were deformed in triaxial compression at temperatures of 20 – 600°C, confining pressures of 30 – 150 MPa, and constant axial strain rate 1x10-5 s-1, and also other relevant data of the figures in the paper. Depending on the applied conditions, which are nominally in the semi-brittle deformation regime of solid Carrara marble, we observed the complete spectrum of natural faulting, stable fault sliding, unstable stick-slip, and bulk deformation with locked fault. The experiments were conducted in the Experimental Rock Deformation Laboratory of the GFZ German Research Centre for Geosciences in Potsdam, Germany. The experimental conditions are listed in Tab. 1. Table 1: Experimental conditions Sample no. ß(°) T(°C) P(MPa) CMSC04 46 20 30 CMSC06 40 20 50 CMSC07 42 20 100 CMSC03 40 20 150 CMSC20 41 100 30 CMSC15 40 200 30 CMSC19 40 200 50 CMSC12 41 300 30 CMSC10 42 300 50 CMSC18 41 300 70 CMSC09 42 300 100 CMSC02 41 300 150 CMSC17 40 400 30 CMSC16 41 400 50 CMSC21 43 500 30 CMSC22 40 500 50 CMSC08 42 600 30

Steps to reproduce

Cylindrical samples were prepared from Carrara marble (Bianco Lorano, Apuane Alps, Italy) and pre-cut at an angle β ≈ 40° with respect to the sample axis. The fault surfaces were ground by machine with a cup wheel or manually on a glass plate with fine-grained (9 µm) SiC powder to obtain flat surfaces with predefined roughness. Samples denoted as CMSCxx, where xx is sample number, were 20 mm long and 10 mm in diameter. All samples were dry and deformed using a Paterson type gas-medium apparatus. Raw data were axial force and axial displacement, measured with a load cell and LVDT, respectively. Raw data (axial force and displacement) were converted to stress and strain by correcting for system compliance, change of cross-sectional area and jacket strength.No code or software other than Origin was used in our correction.

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