Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica
Three-dimensional inversion modelling of airborne magnetic data acquired in the Prince Charles Mountains, East Antarctica, provides an insight into the sub-ice distribution, and three-dimensional geometry of a Neoproterozoic sedimentary basin. A three-dimensional starting model was created from two...
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ftunivnewcastnsw:uon:4765 2023-05-15T13:50:45+02:00 Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica McLean, Mark A. Rawling, Timothy J. Betts, Peter G. Phillips, Glen Wilson, Chris J. L. The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences 2008 http://hdl.handle.net/1959.13/41399 eng eng Elsevier Tectonophysics Vol. 456, Issue 3-4, p. 180-193 10.1016/j.tecto.2008.04.023 aeromagnetic three-dimensional inversion modelling Antarctica Neoproterozoic basin inversion journal article 2008 ftunivnewcastnsw 2018-07-27T01:04:07Z Three-dimensional inversion modelling of airborne magnetic data acquired in the Prince Charles Mountains, East Antarctica, provides an insight into the sub-ice distribution, and three-dimensional geometry of a Neoproterozoic sedimentary basin. A three-dimensional starting model was created from two two-dimensional GM-SYS modelling and our current geological understanding of the study area. Three-dimensional VPmg inversion modelling was performed on the aeromagnetic data to obtain an acceptable fit between the observed response collected in the field, and the calculated response of the three-dimensional model. Modelling suggests that the base of the basin undulates and is relatively unstructured, however the margins of the basin thicken from north (~ 4 km) to south (~ 11 km). The volume of the Sodruzhestvo Group that in-fills the sedimentary basin has been calculated at approximately 35 000 km³. Modelling of Banded Iron Formations at the southern margin of the basin and a sharp magnetic contrast in the north, reveal that both contacts dip toward the south. We interpret this asymmetric geometry of the sedimentary basin as having began as a set of half grabens, bounded by an underlying listric fault that flattened at depth below the sedimentary basin. Subsequent Early Palaeozoic inversion of this structure resulted in reactivation along the low-angle basal detachment, but rather than taking its original course underneath the sedimentary basin, the fault ramped up along the southern margin. This process caused exhumation of the underlying Banded Iron Formations, which are now juxtaposed at similar crustal levels to the Neoproterozoic cover rocks. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Prince Charles Mountains NOVA: The University of Newcastle Research Online (Australia) East Antarctica Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) |
institution |
Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
aeromagnetic three-dimensional inversion modelling Antarctica Neoproterozoic basin inversion |
spellingShingle |
aeromagnetic three-dimensional inversion modelling Antarctica Neoproterozoic basin inversion McLean, Mark A. Rawling, Timothy J. Betts, Peter G. Phillips, Glen Wilson, Chris J. L. Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica |
topic_facet |
aeromagnetic three-dimensional inversion modelling Antarctica Neoproterozoic basin inversion |
description |
Three-dimensional inversion modelling of airborne magnetic data acquired in the Prince Charles Mountains, East Antarctica, provides an insight into the sub-ice distribution, and three-dimensional geometry of a Neoproterozoic sedimentary basin. A three-dimensional starting model was created from two two-dimensional GM-SYS modelling and our current geological understanding of the study area. Three-dimensional VPmg inversion modelling was performed on the aeromagnetic data to obtain an acceptable fit between the observed response collected in the field, and the calculated response of the three-dimensional model. Modelling suggests that the base of the basin undulates and is relatively unstructured, however the margins of the basin thicken from north (~ 4 km) to south (~ 11 km). The volume of the Sodruzhestvo Group that in-fills the sedimentary basin has been calculated at approximately 35 000 km³. Modelling of Banded Iron Formations at the southern margin of the basin and a sharp magnetic contrast in the north, reveal that both contacts dip toward the south. We interpret this asymmetric geometry of the sedimentary basin as having began as a set of half grabens, bounded by an underlying listric fault that flattened at depth below the sedimentary basin. Subsequent Early Palaeozoic inversion of this structure resulted in reactivation along the low-angle basal detachment, but rather than taking its original course underneath the sedimentary basin, the fault ramped up along the southern margin. This process caused exhumation of the underlying Banded Iron Formations, which are now juxtaposed at similar crustal levels to the Neoproterozoic cover rocks. |
author2 |
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences |
format |
Article in Journal/Newspaper |
author |
McLean, Mark A. Rawling, Timothy J. Betts, Peter G. Phillips, Glen Wilson, Chris J. L. |
author_facet |
McLean, Mark A. Rawling, Timothy J. Betts, Peter G. Phillips, Glen Wilson, Chris J. L. |
author_sort |
McLean, Mark A. |
title |
Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica |
title_short |
Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica |
title_full |
Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica |
title_fullStr |
Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica |
title_full_unstemmed |
Three-dimensional inversion modelling of a Neoproterozoic basin in the southern Prince Charles Mountains, East Antarctica |
title_sort |
three-dimensional inversion modelling of a neoproterozoic basin in the southern prince charles mountains, east antarctica |
publisher |
Elsevier |
publishDate |
2008 |
url |
http://hdl.handle.net/1959.13/41399 |
long_lat |
ENVELOPE(67.246,67.246,-71.427,-71.427) |
geographic |
East Antarctica Prince Charles Mountains |
geographic_facet |
East Antarctica Prince Charles Mountains |
genre |
Antarc* Antarctica East Antarctica Prince Charles Mountains |
genre_facet |
Antarc* Antarctica East Antarctica Prince Charles Mountains |
op_relation |
Tectonophysics Vol. 456, Issue 3-4, p. 180-193 10.1016/j.tecto.2008.04.023 |
_version_ |
1766253972862009344 |