HR: 0800h
AN: C51A-0081    [Abstracts]
TI: Integrating drilling results adjacent to the Transantarctic Mountains front with high-resolution aeromagnetic data: an example from Cape Roberts
AU: Armadillo, E
EM: egidio@dipteris.unige.it
AF: Dipartimento per lo Studio del Territorio e delle sue Risorse, Universita' di Genova, V.le Benedetto XV, 5, Genova, 16132, Italy
AU: * Ferraccioli, F
EM: ffe@bas.ac.uk
AF: British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 OET, United Kingdom
AU: Gambetta, M
EM: marco.gambetta@gmail.com
AF: Istituto Nazionale di Geofisica e Vulcanologia, Sez. di Geofisica Marina, Via Pezzino Basso, Fezzano, 19020, Italy
AU: Talarico, F
EM: talarico@unisi.it
AF: Dipartimento di Scienze della Terra, Università di Siena, Via del Laterino, 8, Siena, 53100, Italy
AU: Zunino, A
EM: andrea.zunino@dipteris.unige.it
AF: Dipartimento per lo Studio del Territorio e delle sue Risorse, Universita' di Genova, V.le Benedetto XV, 5, Genova, 16132, Italy
AU: Bozzo, E
EM: bozzo@dipteris.unige.it
AF: Dipartimento per lo Studio del Territorio e delle sue Risorse, Universita' di Genova, V.le Benedetto XV, 5, Genova, 16132, Italy
AB: We present new magnetic models and enhanced maps derived from a high resolution aeromagnetic (HRAM) survey that was performed over a rift basin at the edge of the East Antarctic Ice Sheet (EAIS) and adjacent to the Transantarctic Mountains front of southern Victoria Land as part of the site survey for the Cape Roberts Drilling Project (CRP). The aim of the CRP was to investigate the early history of the EAIS and the tectonics of the West Antarctic Rift System and Transantarctic Mountains by drilling a continuous core through Cenozoic strata. In summary, the completed CRP cores provided 1500 metre of shallow marine Cenozoic strata that recorded climate and mountain/basin history for the period from 17 to 34 Ma ago. Magnetic susceptibility, P-wave velocity and density/porosity log data can now be analysed together with reprocessed and enhanced HRAM data. The magnetic signatures of Cenozoic sedimentary strata have been modeled and several magnetic trends and anomalies are re-discussed in conjunction with drilling results, bathymetric data and published structural interpretations derived from multichannel seismic reflection data. The results of our study suggest that correlation between stratigraphic sequences and magnetic anomaly patterns could potentially be useful also for interpretation of more recent aeromagnetic surveys in southern McMurdo Sound performed in the frame of the Antarctic Drilling Program (ANDRILL), which is targeting Middle Miocene to Quaternary strata, and hence providing new insights into Antarctic climate evolution and ice sheet history.
DE: 1517 Magnetic anomalies: modeling and interpretation
SC: Cryosphere [C]
MN: 2007 Fall Meeting