Magnetic Fabric Distribution in inverted Basin Sandbox Models
Description
Three sandbox models represent different stages of basin inversion. After modelling, samples are taken throughout the models for AMS (Anisotropy of Magnetic Susceptibility) measurements with a MFK1-FA Kappabridge from Agico Inc. The AMS datasets of each model are uploaded here. The datasets include next to the magnetic measurement parameters, the location (x,y, coordinate), depth (which is different to y coordinate), closest distance to next thrust or normal fault, as well as if associated with a fault, how much structure is captured in a sample. Please, see associated publication for further discussion and explanation: Schöfisch et al., "Magnetic Fabric Analyses of Basin Inversion: A Sandbox Modelling approach", in Special Issue of Solid Earth. Some details: Model I shows extension only with two main magnetic fabrics; one is associated with normal faulting, whereas away from the faults the magnetic fabrics remains as initially sieved. Model II and Model III are shortened after extension, but to different degrees respectively. Both have magnetic fabrics that show an overprint towards penetrative-strain induced fabric at areas away from faults, some persistent initial fabric, an overprinted fabric at the normal faults, and finally, thrust-induced fabrics. The reference North in the data is the modelling north, which is the backstop of the sandbox models. The Excel file contains three tabs, one for each model.
Files
Steps to reproduce
A "simple" base-plate model setup is used for all three models with a velocity discontinuity reaching 20 cm into the model. Several layers of a sand-magnetite mixture are sieved into a sandbox model (30 cm wide x 40 cm long) to a total model thickness of 8.3 cm. Magnetite (<0.1 vol%) is the main magnetic contributor for the AMS measurements. After model extension 1 cm (Model I), Model II is shortened by 1.5 cm and Model III by 4 cm. Then, the models are wet and vertical sections are cut into the model. At each model section, cubic samples (plastic containers) are taken (inner volume: 1.7 cm3) at different location and structures of the model. The cubic samples are used for low-field AMS measurements with a MFK1-FA Kappabridge by Agico Inc. The authors refer to the main publication for further details.
Institutions
- Uppsala Universitet