[Parameters: Topic='SOLID EARTH', Term='GEOMAGNETISM']
Interpretation of airborne geophysical data acquired during PCMEGAEntry ID: ASAC_2561
Abstract: Metadata record for data from ASAC Project 2561
See the link below for public details on this project.
The project aims to investigate the multidimensional sub-surface structures in the southern Prince Charles Mountains using the airborne geophysical data acquired during Prince Charles Mountains Expedition of Germany-Australia (PCMEGA). This will be of national significance as it will identify ... continental geological processes occurring in Australia-Antarctica, prior to and during their separation ~120 million years ago, and relate them to present day observations.
Taken from the abstracts of the referenced papers:
Geological exposures in the Lambert Rift region of East Antarctica comprise scattered coastal outcrops and inland nunataks sporadically protruding through the Antarctic ice sheet from Prydz Bay to the southernmost end of the Prince Charles Mountains. This study utilised airborne magnetic, gravity, and ice radar data to interpret the distribution and architecture of tectonic terranes that are largely buried beneath the thick ice sheet. Free-air and Bouger gravity data are highly influenced by the subice and mantle topography, respectively. Gravity stripping facilitated the removal of the effect of ice and Moho, and the residual gravity data set thus obtained for the intermediate crustal level allowed a direct comparison with magnetic data. Interpretation of geophysical data also provided insight into the distribution and geometry of four tectonic blocks: namely, the Vestfold, Beaver, Mawson, and Gamburtsev domains. These tectonic domains are supported by surface observations such as rock descriptions, isotopic data sets, and structural mapping.
Three dimensional 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 cubic kilometres. 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.
(Click for Interactive Map)
Start Date: 2004-10-01Stop Date: 2006-03-31
Quality Missing ten minutes of data due to station service between 2004-12-03, 07:27:24.0 and 2004-12-03, 7:37:23
Access Constraints These data are publicly available for download from the provided URL.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2386 when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 4,580 kb
Distribution Format: excel
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 7 3365 6651
Fax: +61 7 3365 6899
Email: h.mcgowan at uq.edu.au
DEPT OF GEOGRAPHICAL SCIENCE UNIVERSITY OF QUEENSLAND BUILDING 35 - CHAMBERLAIN BLDG
Province or State: Queensland
Postal Code: 4072
Speirs, J.C. McGowan, H.A. Neil, D.T. (2008), Meteorological controls on sand transport and dune morphology in a polar-desert: Victoria Valley, Antarctica., Earth surface processes and landforms, 33, 12, 1875-1891, doi:doi: 10.1002/esp.1739
Speirs, J.C. McGowan, H.A. Neil, D.T. (2008), Polar eolian sand transport: grain characteristics determined by an automated scanning electron microscope (QEMSCANHH)., Arctic, Antarctic and Alpine Research, 40, 4, 731-743, doi:DOI: 10.1657/1523-0430(07-029)[SPEIRS]2.0.CO;2
Ayling, B.F. McGowan, H.A. (2006), Niveo-eolian sediment deposits in coastal South Victoria Land, Antarctica: indicators of regional variability in weather and climate., Arctic, Alpine and Antarctic Research, 38, 3, 313-324
Orwin, J.F. (2005), Frozen dunes: an indicator of climate variability, McMurdo Dry Valleys., Canadian Antarctic research network newsletter, 19, 04
Dickinson, W.W., Rieser, U., Wilson, N., McGowan, H. (2007), OSL age constraints on sediments in Lower Victoria Valley, Antarctica., Quaternary International, 167-168, 99, doi:10.1016/j.quaint.2007.04.001
Creation and Review Dates
DIF Creation Date: 2003-05-26
Last DIF Revision Date: 2012-10-12