A kinematic model of the Scotia plate (SW Atlantic Ocean)

Giner-Robles, J.L.; González-Casado, J.M.; Gumiel, Pablo; Martín-Velázquez, Silvia; Garcı́a-Cuevas, Carmen

doi:10.1016/s0895-9811(03)00064-6

Cited by 32 publications

(26 citation statements)

References 34 publications

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“…A second area of significant seismic activity is located in the western sector of the SSR between the South Shetland Islands and South Orkney Microcontinent [ Bohoyo et al ., ]. Analysis of earthquake focal mechanisms indicates a regional stress regime for the entire Scotia Arc characterized by NE‐SW compression and orthogonal extension, with local stress perturbations [ Pelayo and Wiens , ; Galindo‐Zaldívar et al ., ; Giner‐Robles et al ., ; Thomas et al ., ].…”

Section: Regional Geological Frameworkmentioning

confidence: 99%

“…Relevant and intense transcurrent tectonics were active during most of the Cenozoic and has occurred due to left‐lateral motion between the Antarctic and Scotia plates since at least 8 Ma [ Bohoyo et al ., ; Civile et al ., ]. The oblique regional slip motion gave rise to diverse local kinematics according to the orientations of different segments of the boundary (Figure b) [ Giner‐Robles et al ., ; Bohoyo et al ., ; Civile et al ., ]. The western sector is characterized by a complex transpressive regime at the northern edge of SSR while transtensional deformation occurs in the ridge's interior, the deformation then giving way to normal faults in Bransfield Strait (Figure b) [ Galindo‐Zaldívar et al ., , ; Bohoyo et al ., ; Catalán et al ., ].…”

Section: Regional Geological Frameworkmentioning

confidence: 99%

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

et al. 2016

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The spatial distribution and temporal occurrence of mass transport deposits (MTDs) in the sedimentary infill of basins and submerged banks near the Scotia‐Antarctic plate boundary allowed us to decode the evolution of the tectonic activity of the relevant structures in the region from the Oligocene to present day. The 1020 MTDs identified in the available data set of multichannel seismic reflection profiles in the region are subdivided according to the geographic and chronological distributions of these features. Their spatial distribution reveals a preferential location along the eastern margins of the eastern basins. This reflects local deformation due to the evolution of the Scotia‐Antarctic transcurrent plate boundary and the impact of oceanic spreading along the East Scotia Ridge (ESR). The vertical distribution of the MTDs in the sedimentary record evidences intensified regional tectonic deformation from the middle Miocene to Quaternary. Intensified deformation started at about 15 Ma, when the ESR progressively replaces the West Scotia Ridge (WSR) as the main oceanic spreading center in the Scotia Sea. Coevally with the WSR demise at about 6.5 Ma, increased spreading rates of the ESR and numerous MTDs were formed. The high frequency of MTDs during the Pliocene, mainly along the western basins, is also related to greater tectonic activity due to uplift of the Shackleton Fracture Zone by tectonic inversion and extinction of the Antarctic‐Phoenix Ridge and involved changes at late Pliocene. The presence of MTDs in the southern Scotia Sea basins is a relevant indicator of the interplay between sedimentary instability and regional tectonics.

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Section: Regional Geological Frameworkmentioning

confidence: 99%

Section: Regional Geological Frameworkmentioning

confidence: 99%

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

et al. 2016

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“…5;Fish, 2005), that is flanked to the south by an uplifted block of basement rocks (Platt and Philip, 1995;Richards et al, 1996). This deformational zone is interpreted as a continent-continent collision zone part of the North Scotia ridge, were basement is involved in the deformation (Forsyth, 1975;Ludwig and Rabinowitz, 1982;Pelayo and Wiens, 1989;Giner-Robles et al, 2003;Bry et al, 2004;Figs. 1 and 2) while shallower detachments levels are involved to the north (Fig.…”

Section: Fold-thrust Beltsmentioning

confidence: 99%

“…5). Focal mechanisms from the North Scotia Ridge (Pelayo and Wiens, 1989) examined by fault population analysis show a substantial extensional component towards the continent and a compressive component on the offshore northern boundary of Burdwood bank (Giner-Robles et al, 2003;Figs. 1 and 2).…”

Section: Transform Plate Boundarymentioning

confidence: 99%

Structure and tectonic history of the foreland basins of southernmost South America

Ghiglione¹,

Quinteros²,

Yagupsky³

et al. 2010

Journal of South American Earth Sciences

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“…The active N‐S‐trending East Scotia Ridge represents the eastern tectonic boundary of the Scotia plate. Present‐day relative motions, determined mainly from earthquake data [ Forsyth , 1975; Pelayo and Wiens , 1989; Giner‐Robles et al , 2003], and from global plate circuits [ DeMets et al , 1990, 1994; Thomas et al , 2003], show that in the Scotia Sea region the Antarctic plate is slowly moving (1.7 to 2.0 cm/yr) easterly relative to the South America plate. The relative motion of these two major plates is presently partitioned along the left‐lateral, strike‐slip northern and southern boundaries of the Scotia plate [ Pelayo and Wiens , 1989].…”

Section: Regional Tectonic Setting and Palaeo‐oceanographic Circulationmentioning

confidence: 99%

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

2006

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[ 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.

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A kinematic model of the Scotia plate (SW Atlantic Ocean)

Cited by 32 publications

References 34 publications

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

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

Structure and tectonic history of the foreland basins of southernmost South America

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

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