Propagating rift during the opening of a small oceanic basin: The Protector Basin (Scotia Arc, Antarctica)

Tectonic reconstructions for paleobathymetry in Drake Passage

“…Seismic reflection profiles show that its upper parts are textured by numerous normal faults and dredging returned an assortment of rock types and ages that is similar to that cropping out in Tierra del Fuego (Galindo-Zaldívar et al, 2006;Schenke and Udintsev, 2009;Udintsev et al, 2012). The seismic data quality is insufficient to permit an estimate of tectonic extension factors for the bank.…”

“…Protector Basin hosts a modest fossil median valley, buried beneath approximately 1 km of sediments (Galindo-Zaldívar et al, 2006). Magnetic anomalies over the basin floor reveal a central normalpolarity isochron centred on the median valley, and two further narrow normal-polarity isochrons separated from one another by a wide region of reversed polarity.…”

“…Hill and Barker (1980) modelled the anomalies to interpret the isochrons as 5C to 5 (Miocene), after noting that their reconstruction of the west Scotia Sea required extra east-west extension to fit their southern identifications of anomaly 8. Although this anomaly interpretation has since been reproduced and used widely (Galindo-Zaldívar et al, 2006;Maldonado et al, 2003;Vérard et al, 2012), it is neither a requirement of the short magnetic profiles nor of the better-constrained modern understanding of anomaly 8's distribution in the west Scotia Sea. Eagles et al (2006) show that the isostatically-corrected basement depth suggests a basin age near that of the Eocene-Oligocene boundary.…”

Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect

“…2; Table 2; online Supplement 1) for the Weddell Sea and Scotia Sea from published literature (BAS, 1985;LaBrecque and Ghidella, 1997;Nankivell, 1997;Surinãch et al, 1997;Lodolo et al, 1998Lodolo et al, , 2010Bohoyo et al, 2002Bohoyo et al, , 2007Eagles and Livermore, 2002;Ghidella et al, 2002;Kovacs et al, 2002;Eagles et al, 2005Eagles et al, , 2006Galindo-Zaldívar et al, 2006;König and Jokat, 2006;Maldonado et al, 2007;Eagles, 2010). This map compilation has not been published before and is available in the PANGAEA database (Lindeque et al, 2012).…”

Insights about the structure and evolution of the Scotia Arc from a new magnetic data compilation

“…Some studies suggest that the magnetic anomaly belt extends into the South Scotia Ridge, South Orkney Microcontinent, Discovery Bank, South Georgia and South America (Garrett et al, 1986/87;Suriñach et al, 1997;Barker, 2001), and the connection with the Antarctic Peninsula, the South Shetland Islands and Bransfield Strait (Ghidella et al, 1991(Ghidella et al, , 2011. Most studies of the magnetic anomaly distribution in the Scotia Sea, however, focus on the analysis of sea-floor spreading in order to constrain the tectonic evolution of the Scotia Arc (Eagles and Livermore, 2002;Kovacs et al, 2002;Eagles et al, 2006;Galindo-Zaldívar et al, 2006;Eagles, 2010).…”