Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica
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 fl...
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ftdryad:oai:v1.datadryad.org:10255/dryad.144442 2023-05-15T13:30:42+02:00 Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica Petford, Nick Mirhadizadeh, Seyed Antarctica 2017-05-05T13:19:00Z http://hdl.handle.net/10255/dryad.144442 https://doi.org/10.5061/dryad.sn69s unknown doi:10.5061/dryad.sn69s/1 doi:10.1098/rsos.161083 doi:10.5061/dryad.sn69s Petford N, Mirhadizadeh S (2017) Image-based modelling of lateral magma flow: the Basement Sill, Antarctica. Royal Society Open Science 4(5): 161083. 2054-5703 http://hdl.handle.net/10255/dryad.144442 Magma Igneous intrusion Sill Rheology Article 2017 ftdryad https://doi.org/10.5061/dryad.sn69s https://doi.org/10.5061/dryad.sn69s/1 https://doi.org/10.1098/rsos.161083 2020-01-01T15:50:06Z 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 s−1) at viscosities equating to high particle concentrations (around more than 40%) in the Sill interior point to shear-thinning as an explanation for some types of magmatic layering there. Model transport rates for the Sill magmas imply a maximum emplacement time of ca 105 years, consistent with geochemical evidence for long-range lateral flow. It is a theoretically possibility that fast-flowing magma on a continental scale will be susceptible to planetary-scale rotational forces. Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys Dryad Digital Repository (Duke University) McMurdo Dry Valleys |
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Open Polar |
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Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
Magma Igneous intrusion Sill Rheology |
spellingShingle |
Magma Igneous intrusion Sill Rheology Petford, Nick Mirhadizadeh, Seyed Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica |
topic_facet |
Magma Igneous intrusion Sill Rheology |
description |
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 s−1) at viscosities equating to high particle concentrations (around more than 40%) in the Sill interior point to shear-thinning as an explanation for some types of magmatic layering there. Model transport rates for the Sill magmas imply a maximum emplacement time of ca 105 years, consistent with geochemical evidence for long-range lateral flow. It is a theoretically possibility that fast-flowing magma on a continental scale will be susceptible to planetary-scale rotational forces. |
format |
Article in Journal/Newspaper |
author |
Petford, Nick Mirhadizadeh, Seyed |
author_facet |
Petford, Nick Mirhadizadeh, Seyed |
author_sort |
Petford, Nick |
title |
Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica |
title_short |
Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica |
title_full |
Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica |
title_fullStr |
Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica |
title_full_unstemmed |
Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica |
title_sort |
data from: image based modelling of lateral magma flow: the basement sill, antarctica |
publishDate |
2017 |
url |
http://hdl.handle.net/10255/dryad.144442 https://doi.org/10.5061/dryad.sn69s |
op_coverage |
Antarctica |
geographic |
McMurdo Dry Valleys |
geographic_facet |
McMurdo Dry Valleys |
genre |
Antarc* Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys |
op_relation |
doi:10.5061/dryad.sn69s/1 doi:10.1098/rsos.161083 doi:10.5061/dryad.sn69s Petford N, Mirhadizadeh S (2017) Image-based modelling of lateral magma flow: the Basement Sill, Antarctica. Royal Society Open Science 4(5): 161083. 2054-5703 http://hdl.handle.net/10255/dryad.144442 |
op_doi |
https://doi.org/10.5061/dryad.sn69s https://doi.org/10.5061/dryad.sn69s/1 https://doi.org/10.1098/rsos.161083 |
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1766011515256700928 |