Revised tectonic implications for the magnetic anomalies of the western Weddell Sea

The tectonic regime along the Andes: Present‐day and Mesozoic regimes

“…Variations from this hypothesis relate the marginal basin to a failed arm of the Weddell Sea formed at approximately 150 Ma during the break-up of the Antarctic Peninsula (Alabaster and Storey 1990;Hervé et al 2006;Mpodozis and Ramos 2008) in agreement with the recent proposal of Ghidella et al (2002Ghidella et al ( , 2007 based on the oldest magnetic anomalies of the Weddell Sea that could be as old as Middle Jurassic. If the failed arm model is accepted, as proposed by Hervé et al (2007b), during the Early to Middle Jurassic the southernmost continental margin would not have subduction, been affected by a generalized extension.…”

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

“…The Eocene-Oligocene transition at~33 Ma signifies a period of several major changes: Antarctica's climate changed from warm and relatively ice-sheet free to cold and ice-covered, as temperatures decreased by about 4°C; pCO 2 declined rapidly from 1750 to 700 ppm and orbital cycles changed (Barker, 2001;Zachos et al, 2001;DeConto and Pollard, 2003;Barker and Thomas, 2004;Coxall et al, 2005;Livermore et al, 2005;Pollard and DeConto, 2009); the Antarctic Circumpolar Current (ACC) developed Gahagan, 1998, 2003;Miller et al, 2008) as the Weddell Sea and Drake Passage opened and western Scotia Sea started to open Ghidella et al, 2002;König and Jokat, 2006;Maldonado et al, 2006); ephemeral ice sheets formed the initial East Antarctic Ice Sheet (EAIS) and West Antarctic Ice Sheet (WAIS) on higher elevations Barker et al, 1988;Miller et al, 1990;Oszko, 1997;Barker, 2001) as well as small ice-caps on the northern Antarctic Peninsula Smith and Anderson, 2010;.…”

“…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).…”

Untitled

“…The complex tectonic development of the Weddell Sea sector (Figure 2) has more recently been reconstructed by Hübscher et al (1996a), Jokat et al (1996Jokat et al ( , 1997Jokat et al ( , 2003Jokat et al ( , (1996a, Jokat et al (1996Jokat et al ( , 1997Jokat et al ( , 2003Jokat et al ( , 2004, Leitchenkov et al (1996), Ghidella and LaBrecque (1997), Golynsky and Aleshkova (2000), Ghidella et al (2002), Rogenhagen and Jokat (2002), and König and Jokat (2006). Deciphering of the crustal types in the central Weddell Sea is still hampered by the lack of deep crustal seismic data.…”