Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica ...

• Main Authors: Petford, Nick, Mirhadizadeh, Seyed
• Format: Dataset
• Language: English
• Published: Dryad 2017
• Subjects: Sill; Rheology; Igneous intrusion; McMurdo Dry Valleys; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.5061/dryad.sn69s; https://datadryad.org/stash/dataset/doi:10.5061/dryad.sn69s

The McMurdo Dry Valleys magmatic system, Antarctica, provides a world-class example of pervasive lateral magma flow on a continental scale. The lowermost intrusion (Basement Sill) offers detailed sections through the now frozen particle microstructure of a congested magma slurry. We simulated the flow regime in two and three dimensions using numerical models built on a finite-element mesh derived from field data. The model captures the flow behaviour of the Basement Sill magma over a viscosity range of 1–104 Pa s where the higher end (greater than or equal to 102 Pa s) corresponds to a magmatic slurry with crystal fractions varying between 30 and 70%. A novel feature of the model is the discovery of transient, low viscosity (less than or equal to 50 Pa s) high Reynolds number eddies formed along undulating contacts at the floor and roof of the intrusion. Numerical tracing of particle orbits implies crystals trapped in eddies segregate according to their mass density. Recovered shear strain rates (10−3–10−5 ... : Supplementary MaterialsAdditional data on model runs. This folder contains supplementary figures in ppt and video clips of model test runs and of particle circulation paths. Data include 2 and 3D visualisations, calculations of shear rate and Reynolds numbers and other parameters arising from the model simulations.Supplementary_Materials.zip ...