| Title | Combined use of the GGSFT data base and on board marine collected data to model the Moho beneath the Powell Basin, Antarctica |
| Author | Chávez, R.E.; Flores-Márquez, E.L.; Suriñach, E.; Galindo-Zaldívar, J.G.; Rodríguez-Fernández, J.R.; Maldonado, A. |
| Author Affil | Chávez, R.E., Universidad Nacional Autónoma de México, Instituto de Geofísica, Mexico City, Mexico. Other: Universidad de Buenos Aires, Argentina; Universitat de Barcelona, Spain; Universidad de Granada, Spain |
| Source | Geológica Acta, 5(4), p.323-335, ; GEOSUR 2004; Geosur international symposium, Buenos Aires, Argentina, Nov. 2004, edited by M. Menichetti and A.A. Tassone. Publisher: Facultad de Geologia, Universidad de Barcelona, Barcelona, Spain. ISSN: 1695- 6133 |
| Publication Date | 2007 |
| Notes | In English. 48 refs. GeoRef Acc. No: 284310 |
| Index Terms | Antarctica--Antarctic Peninsula; Scotia Sea; Antarctic Peninsula; Antarctica; basement; basin analysis; crust; data bases; data processing; faults; geophysical methods; geophysical profiles; geophysical surveys; GGSFT; Global Gravity Grid and Sea Floor Topography; gravity methods; lower crust; mantle; Mohorovicic discontinuity; Powell Basin; seismic methods; South Scotia Ridge; surveys; tectonics; three-dimensional models; uplifts; upper mantle |
| Abstract | The Powell Basin is a small oceanic basin located at the NE end of the Antarctic Peninsula developed during the Early Miocene and mostly surrounded by the continental crusts of the South Orkney Microcontinent, South Scotia Ridge and Antarctic Peninsula margins. Gravity data from the SCAN 97 cruise obtained with the R/V Hesperides and data from the Global Gravity Grid and Sea Floor Topography (GGSFT) database (Sandwell and Smith, 1997) are used to determine the 3D geometry of the crustal-mantle interface (CMI) by numerical inversion methods. Water layer contribution and sedimentary effects were eliminated from the Free Air anomaly to obtain the total anomaly. Sedimentary effects were obtained from the analysis of existing and new SCAN 97 multichannel seismic profiles (MCS). The regional anomaly was obtained after spectral and filtering processes. The smooth 3D geometry of the crustal mantle interface obtained after inversion of the regional anomaly shows an increase in the thickness of the crust towards the continental margins and a NW-SE oriented axis of symmetry coinciding with the position of an older oceanic spreading axis. This interface shows a moderate uplift towards the western part and depicts two main uplifts to the northern and eastern sectors. |
| Publication Type | conference paper or compendium article |
| Record ID | 83992 |