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3D density and susceptibility distribution of the Wilkes Subglacial Basin and Transantarctic Mountains in East Antarctica.
We present a 3D crustal model of density and susceptibility distribution in the Wilkes Subglacial Basin and the Transantarctic Mountains (TAM) based on joint inversion of airborne gravity and magnetic data. The applied 'variation of information' technique enforces a coupling between gravity and magnetic sources to give an enhanced inversion result. Our model reveals a large-scale body located in the interior of the Wilkes Subglacial Basin interpreted as a batholithic intrusive structure, as well as a linear dense body at the margin of the Terre Adelie Craton. We provide six netCDF files, which include the input gravity and magnetic data, the inverted gravity and magnetic data, and inverted crustal density and susceptibility distribution. Additionally, a simple jupyter notebook that loads and plots the provided data can be found here: https://doi.org/10.5281/zenodo.8304170
Funding for this research was provided by NERC through a SENSE CDT studentship (NE/T00939X/1)
Simple
- Date (Creation)
- 2023-07-17
- Date (Revision)
- 2023-07-17
- Date (Publication)
- 2023-07-17
- Date (released)
- 2023-07-17
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/5e1424e7-124d-4cc3-ba06-b2285c0b458c
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01765
- Codespace
- Unique resource identifier
- NE/T00939X/1
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award
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Please cite this item as: Lowe, M., Jordan, T., Moorkamp, M., Ebbing, J., Green, C., Losing, M., & Larter, R. (2023). 3D density and susceptibility distribution of the Wilkes Subglacial Basin and Transantarctic Mountains in East Antarctica. (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/5e1424e7-124d-4cc3-ba06-b2285c0b458c
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role British Antarctic Survey Lowe, Maximilian Author British Antarctic Survey Jordan, Tom Author Ludwig Maximilian University of Munich Moorkamp, Max Author Christian-Albrechts-Universitat zu Kiel Ebbing, Joerg Author University of Leeds Green, Christopher Author University of Western Australia Losing, Mareen Author British Antarctic Survey Larter, Robert Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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Density and susceptibility distribution
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Gravity and magnetics
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Joint inversion
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Transantarctic Mountains
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Wilks Subglacial Basin
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- Place
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Transantarctic Mountains and Wilkes Subglacial Basin
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GEMET - INSPIRE themes, version 1.0
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- no limitations to public access
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- no limitations
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- Open Government Licence v3.0
- Use constraints
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No restrictions apply.
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url
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url
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doi
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url
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url
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doi
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doi
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url
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- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Geoscientific information
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- Supplemental Information
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It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.
- Title
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European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
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Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
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6.18.3
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Distributor format
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Name Version application/x-hdf
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bytes
- Transfer size
- 12792627
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5e1424e7-124d-4cc3-ba06-b2285c0b458c Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
Crustal density and susceptibility distribution are inferred from joint inversion of gravity and magnetic data using the 'variation of information' approach. The inversion is carried out with the academic software JIF3D ( https://sourceforge.net/projects/jif3d/) developed by Max Moorkamp.
The density and susceptibility inversion models are discretised into meshes with equal horizontal cell sizes of 7.5 km. The vertical cell size is 1 km at the surface and increases with depth by a factor 1.1 for each cell. Increasing vertical cell size with depth is introduced to account for decreasing resolution with increasing distance to the source in potential field applications. A horizontal cell size of 7.5 km is chosen because the input gravity and magnetic data have a resolution of 10 km.
Additionally, a padding area of 20% around the study area is added to avoid edge effects. The resulting inversion mesh contains 244 cells east-west direction, 140 cells in north-south direction and 21 cells in the z direction (60 km below sea level). To constrain the model geometry, the bedrock topography Curie point depths and Moho depths are used as model boundaries.
All cells are set to a starting value of 0 kg/m3 for the density anomaly model and 0 SI for the magnetic model and are iteratively updated during the VI inversion process.
Note that all the elevation information are provided with positive values down.
Data collection:
The data preparation and the inversion set up is performed in python (version 3.10.11). The inversion itself is carried out in the JIF3D software using a Linux terminal.
The gravity and magnetic data were upwardly continued at a constant station height using the Compudrape plug-in for Geosoft Oasis Montaj version 2021.2.
Data quality:
The RMS error between observed and inverted gravity field is 1.5 mGal and 0.7 nT for the magnetic field. The end members of the residual between observed and inverted values are + 37 and -18 mGal with a standard deviation of 3 mGal for the gravity inversion and for the magnetic inversion +341 and -65 nT with a standard deviation of 13 nT.
Metadata
- File identifier
- 5e1424e7-124d-4cc3-ba06-b2285c0b458c XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2023-07-17
- Metadata standard name
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ISO 19115 Geographic Information - Metadata
- Metadata standard version
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ISO 19115:2003(E)
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
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