3D density and susceptibility distribution of the Wilkes Subglacial Basin and Transantarctic Mountains in East Antarctica. ...

• Main Authors: Lowe, Maximilian, Jordan, Tom, Moorkamp, Max, Ebbing, Joerg, Green, Christopher, Losing, Mareen, Larter, Robert
• Format: Dataset
• Language: English
• Published: NERC EDS UK Polar Data Centre 2023
• Subjects: "EARTH SCIENCE","SOLID EARTH","GEOMAGNETISM","MAGNETIC FIELD"; "EARTH SCIENCE","SOLID EARTH","GRAVITY/GRAVITATIONAL FIELD"; Density and susceptibility distribution; Gravity and magnetics; Joint inversion; Transantarctic Mountains; Wilks Subglacial Basin; Antarc*; Antarctica; East Antarctica
• Online Access: https://dx.doi.org/10.5285/5e1424e7-124d-4cc3-ba06-b2285c0b458c; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01765

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) ... : 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 ...