Central and eastern Bransfield basins (Antarctica) from high-resolution swath-bathymetry data

Gràcia, Eulália; Canals, Miquel; Farran, Marcel-lí; Sorribas, Jordi; Pallàs, Raimón

doi:10.1017/s0954102097000229

Cited by 54 publications

(36 citation statements)

References 20 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The continental slope is a steep (up to 20 ‡) and essentially continuous feature locally incised by gullies . A 20^32 km wide, gently sloping continental rise separates the slope from the £at basin £oor (Gra 'cia et al, 1997). The basin £oor progressively deepens and widens towards the NE.…”

Section: Geological Setting and Physiographymentioning

confidence: 99%

“…1 ;Gra 'cia et al, 1996). From SW to NE, four bathymetric levels can be distinguished, separated from each other by NW^SE morphological steps (Gra 'cia et al, 1996(Gra 'cia et al, , 1997. The largest and the deepest of these levels constitutes the King George Basin, 20 km wide and 50 km long, with a maximum depth of 1950 m (Fig.…”

Section: Geological Setting and Physiographymentioning

confidence: 99%

See 1 more Smart Citation

The Gebra Slide: a submarine slide on the Trinity Peninsula Margin, Antarctica

et al. 2003

View full text Add to dashboard Cite

A large submarine slide^the Gebra Slide^has been discovered on the continental margin of Trinity Peninsula, Central Bransfield Basin, Antarctic Peninsula. The slide scar is clearly expressed in the bathymetry and is cut into the toe of the glacial-period slope-prograding strata on the lower continental slope. Seismic data give evidence of an associated debris-flow deposit embedded in the interglacial-period basin-fill strata of the basin floor. The total volume of sediment involved in the mass movement is about 20 km 3 . Indirect dating of the mass-wasting event, based on seismic^stratigraphic relationships of the slide scar and associated debris-flow deposit with underlying glacial-period slope units and the overlying interglacial-period basin-floor units, suggests that it took place at the transition between the last glacial period and the present-day interglacial. The initiation of the Gebra Slide is attributed to a combination of several factors, such as high sedimentation rates during the last glacial period, the unloading effect of a retreating ice sheet during deglaciation, pre-existing tectonic fabric and high seismicity in the area. This is the first recent submarine slide of this size identified on the glacial, continental margins of Antarctica. In morphology and general characteristics it is quite similar to the well-known large-scale submarine slides from the northern hemisphere glacial margins, although it is smaller. Its most striking characteristic is its lower-slope position (at 1500^2000 m of water depth), which remains up to now difficult to explain. ß

show abstract

Section: Geological Setting and Physiographymentioning

confidence: 99%

Section: Geological Setting and Physiographymentioning

confidence: 99%

The Gebra Slide: a submarine slide on the Trinity Peninsula Margin, Antarctica

et al. 2003

View full text Add to dashboard Cite

show abstract

“…Swath bathymetry data exist over most deep-water parts (W1,000 m) of Bransfield Strait (Lawver et al, 1996;Gra`cia et al, 1997). Along Boyd Strait, 'bundle structures' and mega-scale glacial lineations occur and confirm palaeo-ice stream flow during glacial periods (Canals et al, 2000;COHIMAR/SEDANO Scientific Party, 2003).…”

Section: The South Shetland Islands Regionmentioning

confidence: 98%

Chapter 5 Cenozoic Climate History from Seismic Reflection and Drilling Studies on the Antarctic Continental Margin

Cooper

Brancolini

Escutia

et al. 2008

Antarctic Climate Evolution

View full text Add to dashboard Cite

“…Following cessation of spreading, rollback of the subducting slab beneath the present‐day South Shetland margin led to the opening and development of the Bransfield Basin, an elongated Late‐Pliocene‐to‐recent back‐arc basin [e.g., Gambôa and Maldonado , 1990; Gracia et al , 1996a, 1996b; Barker and Austin , 1998]. Some authors have proposed that the rift extends and merges eastward into an active fault zone within the South Scotia Ridge and accommodates the left‐lateral transcurrent deformation acting along this continental segment [ González‐Casado et al , 2000; Galindo‐Zaldívar et al , 2004].…”

Section: Western Scotia Sea Tectonic Evolutionmentioning

confidence: 99%

Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage

2006

View full text Add to dashboard Cite

[ 1 ] We present arevised tectonic interpretation (from $ 28 Ma to 3.2 Ma) of the western sector of the Scotia Sea, incorporating new multichannel seismic reflection profiles and magnetic anomaly identifications for the continental margin offt he Tierra del Fuego Island, and available complementary data for the conjugate margin of the northwestern flank of the South Scotia Ridge. Seismic profiles show ar emarkable diversity of the pair of conjugate passive margins of the western Scotia Sea in both their morphology and structural framework. The Tierra del Fuego continental margin can be related to ac lassic rifted passive margin, while the southwestern margin of the Scotia Sea is characterized by steep slopes mostly generated by subvertical faults that abruptly separate the continental crust of the South Scotia Ridge from the oceanic crust of the western Scotia Sea. This structural difference was caused by intense strike-slip tectonism, mostly concentrated along the modern South Scotia Ridge since the early development of the western Scotia Sea. We find evidence for ap reviously unrecognized magnetic anomaly 10 ( $ 28 Ma) at the foot of the Tierra del Fuego continental margin; the same anomaly is present at the conjugate northern flank of the South Scotia Ridge. The timing of events leading to the earliest development of the western Scotia Sea, which determined the opening of the Drake Passage is important because this gateway opening had aprofound effect on global circulation and climate. The thickness and the distribution of the sedimentary cover overall in the abyssal plain offt he two western Scotia Sea margins is different. This is due to the different regimes of the bottom-current flows which affected the western Scotia Sea, both in the past and in the present time.

show abstract

Central and eastern Bransfield basins (Antarctica) from high-resolution swath-bathymetry data

Cited by 54 publications

References 20 publications

The Gebra Slide: a submarine slide on the Trinity Peninsula Margin, Antarctica

The Gebra Slide: a submarine slide on the Trinity Peninsula Margin, Antarctica

Chapter 5 Cenozoic Climate History from Seismic Reflection and Drilling Studies on the Antarctic Continental Margin

Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage

Contact Info

Product

Resources

About