A model of oceanic development by ridge jumping: Opening of the Scotia Sea

Tectonic activity evolution of the Scotia‐Antarctic Plate boundary from mass transport deposit analysis

“…The bathymetric base map used in this study comes from GEBCO2014, including the IBCSO database [ Arndt et al ., ]. The main morphological domains are defined based on previous works [e.g., Galindo‐Zaldívar et al ., , ; Bohoyo et al ., ; Maldonado et al ., ; Pérez et al ., , ]. The MTD distribution maps were generated by Generic Mapping Tools and ArcGIS software.…”

“…Continental fragments form the Scotia Arc around the abyssal plain of the Scotia Sea, which is constituted by the Scotia and Sandwich plates [e.g., Barker , ]. The fragmentation of South America and the Antarctic Peninsula led to seafloor spreading in the southwestern part of the Scotia Sea during late Eocene and the initiation of the West Scotia Ridge (WSR) during the Oligocene [ Maldonado et al ., ]. Spreading at the WSR led to the creation of most of what is now the Scotia Plate by the late Miocene, when the ridge became extinct [ Barker and Burrell , ; Maldonado et al ., ; Eagles et al ., ; Geletti et al ., ; Livermore et al ., ; Lodolo et al ., ].…”

“…The sediments in the region are of highly variable thickness and even locally absent. Five seismic units have been traditionally distinguished (V to I from bottom to top) [ Bohoyo , ; Maldonado et al ., ]; however, three older units (VIII, VII, and VI) have recently been identified below the previous ones within the oldest basins [ Maldonado et al ., ; Pérez et al ., ]. These units are bounded by major stratigraphic discontinuities identified as “g” to “a” from bottom to top in the stratigraphic section.…”

Oligocene TEX<sub>86</sub>-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

“…to allow for a significant ACC throughflow (Lawver & Gahagan 2003;Livermore et al 2004;Scher & Martin 2006;Barker et al 2007;Lagabrielle et al 2009;Maldonado et al 2014;Dalziel 2014). Depending on whether Drake Passage was closed or open, modeling suggests that the westward flowing ACCC was stronger or weaker, respectively (Hill et al, 2013).…”

Tectonic Reconstructions of the Southernmost Andes and the Scotia Sea During the Opening of the Drake Passage

“…Dashed profiles are synthetic magnetic anomalies generated for a source layer 1 km thick lying at 4.5 km depth, labelled with chron number. Pink box shows the portion of the HESANT92/93 profiles in which reversal isochrons 11 and 12 were modelled at very small amplitudes by Maldonado et al (2014) The profiles, three for each flank in these corridors, show that anomaly isochrons younger than and including 8 are interpretable in many locations, although by no means are they ubiquitously so. Three of the profiles supply hints that isochron 9 may be present in these corridors.…”