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Combined use of the GGSFT data base and on board marine collected data to model the Moho beneath the Powell Basin, Antarctica
Chávez Segura, René (Universidad Nacional Autónoma de México. Instituto de Geofísica)
Flores Márquez, Elsa Leticia (Universidad Nacional Autónoma de México. Instituto de Geofísica)
Suriñach Cornet, Emma (Universitat de Barcelona. Departament de Geodinàmica i Geofisica)
Galindo Zaldívar, Jesús (Universidad de Granada. Departamento de Geodinámica)
Rodríguez Fernández, José (Universidad de Granada)
Maldonado, Andrés (Universidad de Granada)
Consejo Superior de Investigaciones Científicas (Espanya). Instituto Andaluz de Ciencias de la Tierra

Data: 2007
Resum: 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 Hespérides 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.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l’obra i la creació d’obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l’obra original i es reconegui l’autoria de l’obra original. Creative Commons
Llengua: Anglès.
Document: article ; recerca ; publishedVersion
Matèria: Gravity ; Inverse theory ; Antarctic Peninsula ; Powell Basin ; Marine geophysics
Publicat a: Geologica acta, Vol. 5, Núm. 4 (2007) , p. 323-335, ISSN 1696-5728

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DOI: 10.1344/105.000000293

13 p, 572.9 KB

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