Dataset

Rheology of viscous materials from the CNR-IGG Tectonic Modelling Laboratory at the University of Florence (Italy)

Zwaan, Frank; Rudolf, Michael; Corti, Giacomo; Keir, Derek; Sani, Federico;

2020-09 || GFZ Data Services

This dataset provides rheometric data of three viscous materials used for centrifuge experiments at the Tectonic Modelling Laboratory of CNR-IGG at the Earth Sciences Department of the University of Florence (Italy). The first material, PP45, is a mixture of a silicone (Polydimethylsiloxane or PDMS SGM36) and plasticine (Giotto Pongo). The PDMS is produced by Dow Corning and its characteristics are described by e.g. Rudolf et al. 2016a,b). Giotto Pongo is produced by FILA (Italy). Both components are mixed following a weight ratio of 100:45, and the final mixture has a density of 1520 kg m3.

The second material, SCA705 is a mixture of Dow Corning 3179 putty, mixed with fine corundum sand and oleic acid with a weight ratio of 100:70:05 and a resulting density of 1660 kg m3. The final material, SCA7020 consists of the same components as SCA705, but with a slightly higher oleic acid content reflected in the weight ratio of 100:70:20. The mixture’s density is 1620 kg m3. The material samples have been analyzed in the Helmholtz Laboratory for Tectonic Modelling (HelTec) at GFZ German Research Centre for Geosciences in Potsdam using an Anton Paar Physica MCR 301 rheometer in a plate-plate configuration at room temperature (20˚C). Rotational (controlled shear rate) tests with shear rates varying from 10-4 to 1 s-1 were performed. Additional temperature tests were run with shear rates between 10-2 to 10-1 s-1 for a temperature range between 15 and 30˚C.

According to our rheometric analysis, the materials all exhibit shear thinning behavior, with high power law exponents (n-number) for strain rates below 10-2s-1, while power law exponents are lower above that threshold.For PP45, the respective n-numbers are 4.8 and 2.6, for SCA705 6.7 and 1.5, and for SCA7020 9.1 and 2.0. The temperature tests show decreasing viscosities with increasing temperatures with rates of -3.8, -1.4 and -1.9% per ˚K for PP45, SCA705 and SCA7020, respectively. An application of the materials tested can be found in Zwaan et al. (2020).

Originally assigned keywords

Corresponding MSL vocabulary keywords

MSL enriched keywords

Originally assigned sub domains

analogue modelling of geologic processes

MSL enriched sub domains	rock and melt physics analogue modelling of geologic processes
Source	http://doi.org/10.5880/fidgeo.2020.018
Source publisher	GFZ Data Services
DOI	10.5880/fidgeo.2020.018
License	CC BY 4.0
Authors	Zwaan, Frank 0000-0001-8226-2132 University of Florence, Florence, Italy Rudolf, Michael 0000-0002-5077-5221 GFZ German Research Centre for Geosciences, Potsdam, Germany Corti, Giacomo 0000-0001-7399-4438 CNR Italian National Research Council, Italy Keir, Derek 0000-0001-8787-8446 University of Southampton, Southampton, UK Sani, Federico 0000-0001-8832-1471 University of Florence, Florence, Italy
References	Zwaan, F., Corti, G., Keir, D., & Sani, F. (2020). Analogue modelling of marginal flexure in Afar, East Africa: Implications for passive margin formation. Tectonophysics, 796, 228595. https://doi.org/10.1016/j.tecto.2020.228595 10.1016/j.tecto.2020.228595 IsSupplementTo Cites Bürgmann, R., & Dresen, G. (2008). Rheology of the Lower Crust and Upper Mantle: Evidence from Rock Mechanics, Geodesy, and Field Observations. Annual Review of Earth and Planetary Sciences, 36(1), 531–567. https://doi.org/10.1146/annurev.earth.36.031207.124326 10.1146/annurev.earth.36.031207.124326 Cites Cites Rudolf, M., Boutelier, D., Rosenau, M., Schreurs, G., & Oncken, O. (2016). Rheological benchmark of silicone oils used for analog modeling of short- and long-term lithospheric deformation. Tectonophysics, 684, 12–22. https://doi.org/10.1016/j.tecto.2015.11.028 10.1016/j.tecto.2015.11.028 Cites Rudolf, M., Boutelier, D., Rosenau, M., Schreurs, G., & Oncken, O. (2016). Supplement to: Rheological benchmark of silicone oils used for analog modeling of short- and long-term lithospheric deformation [Data set]. GFZ Data Services. https://doi.org/10.5880/GFZ.4.1.2016.001 10.5880/GFZ.4.1.2016.001 Cites Rudolf, M., Boutelier, D., Rosenau, M., Schreurs, G., & Oncken, O. (2016). Rheological benchmark of silicone oils used for analog modeling of short- and long-term lithospheric deformation. Tectonophysics, 684, 12–22. https://doi.org/10.1016/j.tecto.2015.11.028 10.1016/j.tecto.2015.11.028 Cites Zwaan, F., Rudolf, M., Pohlenz, A., Corti, G., Keir, D., & Sani, F. (2020). Ring-shear test data of feldspar sand from the CNR-IGG Tectonic Modelling Laboratory at the University of Florence (Italy) [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2020.019 10.5880/fidgeo.2020.019 References Zwaan, F., Corti, G., Keir, D., & Sani, F. (2020). Images and videos of analogue centrifuge models exploring marginal flexure during rifting in Afar, East Africa [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2020.020 10.5880/fidgeo.2020.020 References Zwaan, F., Corti, G., Keir, D., Sani, F., Muluneh, A., Illsley-Kemp, F., & Papini, M. (2020). Geological data from the Western Afar Margin, East Africa [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2020.017 10.5880/fidgeo.2020.017 References
Contact	Zwaan, Frank University of Bern, Bern, Switzerland frank.zwaan@geo.unibe.ch, fzwaan@hotmail.com
Citation	Zwaan, F., Rudolf, M., Corti, G., Keir, D., & Sani, F. (2020). Rheology of viscous materials from the CNR-IGG Tectonic Modelling Laboratory at the University of Florence (Italy) [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2020.018