3D susceptibility distribution model derived from 2010 BGR magnetic survey of the Mesa Range in northern Victoria Land, East Antarctica ...

• Main Authors: Lowe, Maximilian, Jordan, Tom, Ebbing, Joerg, Koglin, Nikola, Ruppel, Antonia, Moorkamp, Max, Green, Christopher, Laufer, Andreas, Liebsch, Jonas, Ginga, Mikhail, Larter, Robert
• Format: Dataset
• Language: English
• Published: NERC EDS UK Polar Data Centre 2024
• Subjects: "EARTH SCIENCE","SOLID EARTH","GEOMAGNETISM"; East Antarctica; Mesa Range; magnetic inversion; magnetics; susceptibility distribution; Antarc*; Antarctica; Victoria Land
• Online Access: https://dx.doi.org/10.5285/ff3798b8-146f-42c2-870e-64c738970350; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01824

We present a 3D crustal model of susceptibility distribution in the Messa Range in northern Victoria Land, East Antarctica. The inversion is based on airborne magnetic data with a line spacing of 500m conducted by the Federal Institute for Geosciences and Natural Resources (BGR) in 2010. The inverted susceptibility allows to discriminate the three dominant rock types in the area namely Kirkpatrick Basalt, Ferrar rock and Granit Harbour intrusive. We provide three netCDF files, which include the input magnetic data, the inverted magnetic field, and inverted crustal susceptibility distribution. Funding for this research was provided by NERC through a SENSE CDT studentship (NE/T00939X/1) ... : Crustal susceptibility distribution is inferred from magnetic inversion of airborne magnetic data. The inversion is carried out with the academic software JIF3D (https://sourceforge.net/projects/jif3d/) developed by Max Moorkamp. The susceptibility inversion model is discretised into meshes with equal horizontal cell sizes of 250m. The vertical cell size is 100m at the surface. The vertical cell size 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. Additionally, a padding area of 20% around the study area is added to avoid edge effects. The resulting inversion mesh contains 324 cells east-west direction, 276 cells in north-south direction and 38 cells in the z direction (32.7 km below sea level). To constrain the model geometry, the bedrock topography and Curie Point depths are used as model boundaries. All cells are set to a starting value of ...