Combined use of the GGSFT data base and on board marine collected data to model the Moho beneath the Powell Basin, Antarctica
The Powell Basin is a small oceanic basin located at the NE end of the Antarctic Peninsula developed during theEarly Miocene and mostly surrounded by the continental crusts of the South Orkney Microcontinent, SouthScotia Ridge and Antarctic Peninsula margins. Gravity data from the SCAN 97 cruise obt...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:50550406 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=50550406 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias de la Tierra Gravity Powell Basin Inverse theory Marine geophysics Antarctic Peninsula |
| Sumario: | The Powell Basin is a small oceanic basin located at the NE end of the Antarctic Peninsula developed during theEarly Miocene and mostly surrounded by the continental crusts of the South Orkney Microcontinent, SouthScotia Ridge and Antarctic Peninsula margins. Gravity data from the SCAN 97 cruise obtained with the R/VHespérides and data from the Global Gravity Grid and Sea Floor Topography (GGSFT) database (Sandwell andSmith, 1997) are used to determine the 3D geometry of the crustal-mantle interface (CMI) by numerical inversionmethods. Water layer contribution and sedimentary effects were eliminated from the Free Air anomaly toobtain the total anomaly. Sedimentary effects were obtained from the analysis of existing and new SCAN 97multichannel 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 showsan increase in the thickness of the crust towards the continental margins and a NW-SE oriented axis of symmetrycoinciding with the position of an older oceanic spreading axis. This interface shows a moderate uplifttowards the western part and depicts two main uplifts to the northern and eastern sectors |
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