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Journal Article

Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation Available to Purchase

Roy Livermore, Graeme Eagles, Peter Morris, Andres Maldonado
Journal: Geology
Published: 01 September 2004
Geology (2004) 32 (9): 797–800.
DOI: https://doi.org/10.1130/G20537.1
... circumpolar ocean currents, but the timing of opening is unclear, because the Shackleton Fracture Zone could have blocked the gateway until the early Miocene. Geophysical and geochemical evidence presented here suggests that the Shackleton Fracture Zone is an oceanic transverse ridge, formed by uplift related...
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View PDF for article title, <span class="search-highlight">Shackleton</span> <span class="search-highlight">Fracture</span> <span class="search-highlight">Zone</span>: No barrier to early circumpolar ocean circulation
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Figure 2. A: Tectonic summary map of southeastern Shackleton Fracture Zone. Features labeled are discussed in text. Projection is oblique Mercator, projected about pole (68°S, 76°W). Shallow earthquake epicenters (Engdahl et al., 1998; yellow stars), Harvard Centroid Moment Tensor solutions (black beach balls), and focal mechanisms from Pelayo and Wiens (1989; blue beach balls) are also shown. Small arrows along Shackleton Fracture Zone (bold black line) represent Antarctica-Scotia plate motion with rates shown in shaded rectangles, calculated from model TLP2003 (Thomas et al., 2003). Large arrows at West Scotia Ridge axis indicate direction of spreading before (black) and during (white) final, oblique, phase of spreading between 8 and 6.5 Ma. Deep basin (shaded) is interpreted as pull-apart feature. Location of seismic reflection profile KSL93-1 (Kim et al., 1997) is shown. Green line—2000 m isobath representing approximate position of Antarctic continental edge; blue line—outline of median valley of extinct West Scotia Ridge spreading center. B: High-resolution bathymetry of Shackleton Fracture Zone and adjacent parts of Antarctic Peninsula margin (EI—Elephant Island) and West Scotia Ridge, obtained with hull-mounted multibeam echo sounders fitted to BIO Hesperides and RRS James Clark Ross.

Figure 2. A: Tectonic summary map of southeastern Shackleton Fracture Zone.... Available to Purchase

Published: 01 September 2004
Figure 2. A: Tectonic summary map of southeastern Shackleton Fracture Zone. Features labeled are discussed in text. Projection is oblique Mercator, projected about pole (68°S, 76°W). Shallow earthquake epicenters ( Engdahl et al., 1998 ; yellow stars), Harvard Centroid Moment Tensor solutions
Journal Article

The Cenozoic subduction history of the Pacific margin of the Antarctic Peninsula: ridge crest–trench interactions Available to Purchase

P. F. Barker
Published: 01 December 1982
Journal of the Geological Society (1982) 139 (6): 787–801.
DOI: https://doi.org/10.1144/gsjgs.139.6.0787
...P. F. Barker Abstract New magnetic anomaly identifications W of the Shackleton Fracture Zone show 5 spreading sections, separated by fracture zones. In the 2 most southerly, the ridge crest collided with a trench at the margin of the Antarctic Peninsula only 6.5 and 4 Ma ago, the latest of a series...
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Journal Article

Autopsy on a dead spreading center: The Phoenix Ridge, Drake Passage, Antarctica Available to Purchase

Roy Livermore, Juan Carlos Balanyá, Andrés Maldonado, José Miguel Martínez, José Rodríguez-Fernández, Carlos Sanz de Galdeano, Jesús Galindo Zaldívar, Antonio Jabaloy, Antonio Barnolas, Luis Somoza, Javier Hernández-Molina, Emma Suriñach, César Viseras
Journal: Geology
Published: 01 July 2000
Geology (2000) 28 (7): 607–610.
DOI: https://doi.org/10.1130/0091-7613(2000)28<607:AOADSC>2.0.CO;2
... Ridge; box shows area represented by Figure 3 . BS—Bransfield Strait; HFZ—Hero Fracture Zone; SCT—southern Chile Trench; SFZ—Shackleton Fracture Zone; SST—South Shetland Trench; WSR—West Scotia Ridge. Figure 3. Selected magnetic anomaly profiles over Phoenix Ridge; positive parts of new BIO...
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Journal Article

Structural geology and geochronology of subduction complexes along the margin of Gondwanaland: New data from the Antarctic Peninsula and southernmost Andes Available to Purchase

ANNE M. GRUNOW, IAN W.D. DALZIEL, T. MARK HARRISON, MATTHEW T. HEIZLER
Journal: GSA Bulletin
Published: 01 November 1992
GSA Bulletin (1992) 104 (11): 1497–1514.
DOI: https://doi.org/10.1130/0016-7606(1992)104<1497:SGAGOS>2.3.CO;2
... Passage opening/Shackleton Fracture Zone formation in the case of the Gibbs Island subgroup. Geological Society of America 1992 ...
View PDF for article title, Structural geology and geochronology of subduction complexes along the margin of Gondwanaland: New data from the Antarctic Peninsula and southernmost Andes
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Figure 1. Bransfield Strait, West Antarctica, showing bathymetry (color, 100 m contours), refraction profiles (black lines), and ocean-bottom seismograph positions (red dots) in central Bransfield basin (CBB). Northeast-southwest–trending neovolcanic edifices occur between Bridgeman and Deception Islands (BI, DI). Progression from shallowest water in western Bransfield basin (WBB), to stepwise deepening of CBB to northeast, and rhomb-shaped deeps in eastern Bransfield basin (EBB) suggests basinwide structural control. Inset: Bransfield Strait is inboard of South Shetland Trench, between Hero and Shackleton fracture zones. Backarc extension may have begun when cessation of spreading between Hero and Shackleton fracture zones caused former Phoenix plate (shaded) to become Antarctic plate (Barker, 1982). Rocas Verdes basin, southernmost Andes, is also shown (RVB, gray line, and on South Georgia, SG). AP is Antarctic Peninsula; SA is South America.

Figure 1. Bransfield Strait, West Antarctica, showing bathymetry (color, 10... Available to Purchase

Published: 01 February 2003
and Shackleton fracture zones. Backarc extension may have begun when cessation of spreading between Hero and Shackleton fracture zones caused former Phoenix plate (shaded) to become Antarctic plate ( Barker, 1982 ). Rocas Verdes basin, southernmost Andes, is also shown (RVB, gray line, and on South Georgia, SG
Image
Figure 1. Bathymetry in Drake Passage predicted using satellite altimetry (Smith and Sandwell, 1994). Dotted lines represent inactive Phoenix Ridge and West Scotia Ridge; box shows area represented by Figure 3. BS—Bransfield Strait; HFZ—Hero Fracture Zone; SCT—southern Chile Trench; SFZ—Shackleton Fracture Zone; SST—South Shetland Trench; WSR—West Scotia Ridge.

Figure 1. Bathymetry in Drake Passage predicted using satellite altimetry (... Available to Purchase

Published: 01 July 2000
—Shackleton Fracture Zone; SST—South Shetland Trench; WSR—West Scotia Ridge.
Image
(a) Simplified regional tectonic map and location of the South Shetland Islands Archipelago (modified from Ibáñez et al. 2003). HFZ, Hero Fracture Zone; SFZ, Shackleton Fracture Zone. (b) South Shetland Islands Archipelago and location of Deception Island (modified from Grad et al. 1992). (c) Orthophotomap of Deception Island (http://lagc.uca.es/web_lagc/orto.jpg). Sites of 1967, 1969 and 1970 events are also shown.

( a ) Simplified regional tectonic map and location of the South Shetland I... Available to Purchase

Published: 15 September 2014
Fig. 1. ( a ) Simplified regional tectonic map and location of the South Shetland Islands Archipelago (modified from Ibáñez et al . 2003 ). HFZ, Hero Fracture Zone; SFZ, Shackleton Fracture Zone. ( b ) South Shetland Islands Archipelago and location of Deception Island (modified from Grad et
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Location map of southernmost Andes showing tectonic plates, basins, and summary of ocean floor ages and directions of opening in Scotia Sea region from Barker (2001), Livermore et al. (2005), Eagles et al. (2006), and Lodolo et al. (2006). MFFZ—Magallanes-Fagnano fault zone; SFZ—Shackleton fracture zone; TF—Tierra del Fuego.

Location map of southernmost Andes showing tectonic plates, basins, and sum... Available to Purchase

Published: 01 August 2008
—Shackleton fracture zone; TF—Tierra del Fuego.
Image
Tectonic setting of the Scotia plate. BB, Bruce Bank; CDMC, Cordillera Darwin metamorphic complex; DB, Discovery Bank; HB, Herdman Bank; JB, Jane Bank; RVB, Rocas Verdes Basin; SFZ, Shackleton Fracture Zone; SOM, South Orkney microcontinent; SSIB, South Shetland Islands Block; SST, South Shetland Trough. Source: Maldonado et al. (2006).

Tectonic setting of the Scotia plate. BB, Bruce Bank; CDMC, Cordillera Darw... Open Access

Published: 14 June 2023
Fig. 1. Tectonic setting of the Scotia plate. BB, Bruce Bank; CDMC, Cordillera Darwin metamorphic complex; DB, Discovery Bank; HB, Herdman Bank; JB, Jane Bank; RVB, Rocas Verdes Basin; SFZ, Shackleton Fracture Zone; SOM, South Orkney microcontinent; SSIB, South Shetland Islands Block; SST, South
Image
Figure 1. Map of Drake Passage and environs, showing free-air gravity anomalies from Sandwell and Smith (1997). Superimposed are relocated earthquake epicenters from Engdahl et al. (1998) (black dots) and rock-dredge sites (red circles). Dotted box shows extent of mapped area in Figure 2. Southeastward along Shackleton Fracture Zone (FZ) from its intersection with West Scotia Ridge is Shackleton transverse ridge, bathymetric feature named in this paper and shown in more detail in Figure 2. Inset: Location of Drake Passage, showing Polar Front (red line) and area represented by main map (blue box).

Figure 1. Map of Drake Passage and environs, showing free-air gravity anoma... Available to Purchase

Published: 01 September 2004
. Southeastward along Shackleton Fracture Zone (FZ) from its intersection with West Scotia Ridge is Shackleton transverse ridge, bathymetric feature named in this paper and shown in more detail in Figure 2 . Inset: Location of Drake Passage, showing Polar Front (red line) and area represented by main map (blue
Image
Generalized modern map of the tectonic elements of southern South America. (CD – Cordillera Darwin; CS – Cordillera Sarmiento; CMC – Coastal Metamorphic Complex; IC – Isla Cook; MB – Monte Burney; TC – Tortuga Complex. Inset Map: SFZ–Shackleton Fracture Zone; SG – South Georgia Island; SOI — South Orkney Islands; SP – Sandwich Plate; SSA – South Sandwich Arc; SSI – South Shetland Islands). (Map prepared using GeoMapApp (http://www.geomapapp/org), Ryan et al. (2009).

Generalized modern map of the tectonic elements of southern South America. ... Available to Purchase

Published: 01 October 2016
Figure 3 Generalized modern map of the tectonic elements of southern South America. (CD – Cordillera Darwin; CS – Cordillera Sarmiento; CMC – Coastal Metamorphic Complex; IC – Isla Cook; MB – Monte Burney; TC – Tortuga Complex. Inset Map: SFZ–Shackleton Fracture Zone; SG – South Georgia Island
Image
(a) Tectonic setting of the Magallanes-Austral Basin and other Cenozoic depocenters (yellow) in relation to key southern plate boundary features (after [44, 50, 154]). Global Multi-Resolution Topography (GMRT) base map from GeoMapApp©. Black stars denote stratigraphic areas discussed in the text: CC: Cerro Castillo; SJ: San Julián; NP: Nazca plate; NSR: North Scotia Ridge; MFFZ: Magallanes-Fagnano Fault Zone; SFZ: Shackleton Fracture Zone. (b) Location of the Cerro Castillo-Cancha Carrera study area within the Cenozoic Magallanes-Austral Basin outcrop belt along the eastern margins of the Patagonian thrust belt. Geologic map was compiled from Malumián et al. [98], SERNAGEOMIN [155], and Fosdick et al. [50]. Zircon crystallization ages are summarized from igneous and recycled sediment sources [29].

(a) Tectonic setting of the Magallanes-Austral Basin and other Cenozoic dep... Open Access

Published: 04 September 2020
discussed in the text: CC: Cerro Castillo; SJ: San Julián; NP: Nazca plate; NSR: North Scotia Ridge; MFFZ: Magallanes-Fagnano Fault Zone; SFZ: Shackleton Fracture Zone. (b) Location of the Cerro Castillo-Cancha Carrera study area within the Cenozoic Magallanes-Austral Basin outcrop belt along the eastern
Image
Physiography of the Scotia arc. White arrows show path of the Antarctic Circumpolar Current (ACC) through Drake Passage, and outlets through the North Scotia Ridge. Red arrows show relative motion of the South America and Antarctic plates (∼22 mm/yr). White ellipse represents former position of the South Georgia microcontinent (see text). NSR—North Scotia Ridge; SSR—South Scotia Ridge; SFZ—Shackleton Fracture Zone; WSS—west Scotia Sea; CS—central Scotia Sea; ASSA—ancestral South Sandwich arc; ESS—east Scotia Sea. Positive features (clockwise from the northwest): CD—Cordillera Darwin; CH—Cape Horn; SI—Isla de los Estados (Staten Island); BwB—Burdwood Bank; DvB—Davis Bank; BkP—Barker Plateau; BSR—Black and Shag Rocks platform; NEGR—northeast Georgia Rise; HB—Herdman Bank; DB—Discovery Bank; JB—Jane Bank; BB—Bruce Bank; PB—Pirie Bank; TR—Terror Rise.

Physiography of the Scotia arc. White arrows show path of the Antarctic Cir... Open Access

Published: 01 April 2014
position of the South Georgia microcontinent (see text). NSR—North Scotia Ridge; SSR—South Scotia Ridge; SFZ—Shackleton Fracture Zone; WSS—west Scotia Sea; CS—central Scotia Sea; ASSA—ancestral South Sandwich arc; ESS—east Scotia Sea. Positive features (clockwise from the northwest): CD—Cordillera Darwin
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Drake Passage–Scotia arc region physiography and path of Antarctic Circumpolar Current. Physical features (from GeoMapApp, Lamont Doherty Earth Observatory, Columbia University, United States): BkB—Barker Bank (formally proposed name, previously informally Aurora Bank); BwB—Burdwood Bank; BB—Bruce Bank; CSS—central Scotia Sea; DB—Discovery Bank; DvB—Davis Bank; ESS—east Scotia Sea; HB—Herdman Bank; JB—Jane Bank; NGR—Northeast Georgia Rise; PB—Pirie Bank; SFZ—Shackleton Fracture Zone; SRB—Shag Rocks Bank; SSI—South Sandwich Islands; SG—South Georgia microcontinent; SOI—South Orkney Islands microcontinent; TR—Terror Rise; WSS—west Scotia Sea. Ocean currents and fronts (Naveira Garabato et al., 2002): ACC—Antarctic Circumpolar Current; PF—Polar Front; SACCF—South Antarctic Circumpolar Current Front; SAF—Sub-Antarctic Front; SB—southern boundary of the ACC. Note that Polar Front is the core of the flow of Circumpolar Deep Water of the Antarctic Circumpolar Current. White arrows show the three main pathways of ACC. Red and yellow stars show locations of dredge hauls referred to in text from forearc of active South Sandwich Islands (SSI) volcanic arc and Discovery Bank, respectively.

Drake Passage–Scotia arc region physiography and path of Antarctic Circumpo... Available to Purchase

Published: 01 September 2013
Bank; BB—Bruce Bank; CSS—central Scotia Sea; DB—Discovery Bank; DvB—Davis Bank; ESS—east Scotia Sea; HB—Herdman Bank; JB—Jane Bank; NGR—Northeast Georgia Rise; PB—Pirie Bank; SFZ—Shackleton Fracture Zone; SRB—Shag Rocks Bank; SSI—South Sandwich Islands; SG—South Georgia microcontinent; SOI—South Orkney
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Figure 9. Reconstructions of the positions of Marie Byrd Land crustal block (MBL) on the Pacific margin of Antarctica within the fragmenting Gondwana supercontinent in Early Cretaceous (117 Ma), mid-Cretaceous (100 Ma), Late Cretaceous (85 Ma), and Oligocene (30 Ma) time. MA and MR on the reconstruction for Early Cretaceous time are the Amundsen and Ross provinces of Pankhurst et al. (1998) and incorporate the paleomagnetic sites of “east” and “west” Marie Byrd Land of DiVenere et al. (1995), respectively, used to position the two fragments. South Pole is shown at its present position within East Antarctica in all four reconstructions; South Pole locations for East Antarctica (cross and alpha 95 confidence circle) based on the synthetic polar wander path of DiVenere et al. (1994) are shown for 117 and 100 Ma when they are within the area shown on the map. AP—Antarctic Peninsula crustal block; AUS—Australia; CHP—Challenger Plateau; CP—Campbell Plateau (E—east, W—west); CR—Chatham Rise; EWM—Ellsworth-Whitmore Mountains crustal block; LF—Lafonian microplate; LHR—Lord Howe Rise; NZ—New Zealand; SAM—South America; SFZ—ancestral Shackleton fracture zone of Grunow et al. (1992); SG—South Georgia; TI—Thurston Island crustal block. Dashed line (30 Ma reconstruction) is the limit of the suggested Marie Byrd Land plume of Le Masurier and Landis (1996); double-arrowed line (85 Ma reconstruction) is incipient Pacific-Antarctic spreading center between the New Zealand microcontinent and the Marie Byrd Land crustal block of Antarctica.

Figure 9. Reconstructions of the positions of Marie Byrd Land crustal block... Available to Purchase

Published: 01 April 2000
block; AUS—Australia; CHP—Challenger Plateau; CP—Campbell Plateau (E—east, W—west); CR—Chatham Rise; EWM—Ellsworth-Whitmore Mountains crustal block; LF—Lafonian microplate; LHR—Lord Howe Rise; NZ—New Zealand; SAM—South America; SFZ—ancestral Shackleton fracture zone of Grunow et al. (1992) ; SG—South
Journal Article

Bransfield Basin, Antarctic Peninsula: Not a normal backarc basin Available to Purchase

José M. González-Casado, Jorge L. Giner Robles, Jerónimo López-Martínez
Journal: Geology
Published: 01 November 2000
Geology (2000) 28 (11): 1043–1046.
DOI: https://doi.org/10.1130/0091-7613(2000)28<1043:BBAPNA>2.0.CO;2
... region (e.g., Lawver et al., 1996 ). However, under this stress field the plate boundary represented by the Shackleton Fracture Zone must have a convergent character, and not the previously proposed transcurrent one (Fig. 4A) . The Bransfield Basin is an elongated marginal submarine basin located...
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Book Chapter

Extensional deformation and development of deep basins associated with the sinistral transcurrent fault zone of the Scotia–Antarctic plate boundary Available to Purchase

Author(s)
F. Bohoyo, J. Galindo-Zaldívar, A. Jabaloy, A. Maldonado, J. Rodríguez-Fernández, A. Schreider, E. Suriñach
Book: Tectonics of Strike-Slip Restraining and Releasing Bends
Series: Geological Society, London, Special Publications
Publisher: Geological Society of London
Published: 01 January 2007
DOI: 10.1144/SP290.6
EISBN: 9781862395381
... subduction of the South America plate below the Sandwich plate ( Livermore et al. 1997 ; Larter et al. 2003 ; Livermore 2003 ), the western boundary is located at the Shackleton fracture zone, which is an intra-oceanic active sinistral transpressive NW–SE-oriented fault zone with sharp positive relief...
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Abstract
View PDF for content titled, Extensional deformation and development of deep basins associated with the sinistral transcurrent fault <span class="search-highlight">zone</span> of the Scotia–Antarctic plate boundary
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Abstract The Scotia–Antarctic plate boundary extends along the southern branch of the Scotia Arc, between triple junctions with the former Phoenix plate to the west (57°W) and with the Sandwich plate to the east (30°W). The main mechanism responsible for the present arc configuration is the development of the Scotia and Sandwich plates from 30–35 Ma, related to breakup of the continental connection between South America and the Antarctic Peninsula. The Scotia–Antarctic plate boundary is a very complex tectonic zone, because both oceanic and continental elements are involved. Present-day sinistral transcurrent motion probably began 8 Ma ago. The main active structures that we observed in the area include releasing and restraining bends, with related deep extensional and compressional basins, and probable pull-apart basins. The western sector of the plate boundary crosses fragmented continental crust: the Western South Scotia Ridge, with widespread development of pull-apart basins and releasing bends deeper than 5000 m, filled by asymmetrical sedimentary wedges. The northern border of the South Orkney microcontinent, in the central sector, has oceanic and continental crust in contact along a large thrust zone. Finally, the eastern sector of the South Scotia Ridge is located within Discovery Bank, a piece of continental crust from a former arc. On its southern border, strike-slip and normal faults produce a 5500-m-deep trough that may be interpreted as a pull-apart basin. In the eastern and western South Scotia Ridge, despite extreme continental-crustal thinning, the basins show no development of oceanic crust. This geometry is conditioned by the distinctive rheological behaviour of the crust involved, with the bulk concentration of deformation within the rheologically weaker continental blocks.

Journal Article

Neogene glacial record from the Sirius Group of the Shackleton Glacier region, central Transantarctic Mountains, Antarctica Available to Purchase

Michael J. Hambrey, Peter-Noel Webb, David M. Harwood, Lawrence A. Krissek
Journal: GSA Bulletin
Published: 01 August 2003
GSA Bulletin (2003) 115 (8): 994–1015.
DOI: https://doi.org/10.1130/B25183.1
... 57% of the total logged section in the Shackleton Glacier Formation and 75% in Bennett Platform Formation. Massive diamict also represents, in terms of area, the most extensive lithofacies on Roberts Massif ( Fig. 10A ). Here, the diamict fractures along subhorizontal surfaces that commonly bear...
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View PDF for article title, Neogene glacial record from the Sirius Group of the <span class="search-highlight">Shackleton</span> Glacier region, central Transantarctic Mountains, Antarctica
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Journal Article

Cretaceous–Paleogene tectonic reconstructions of the South Scotia Ridge and implications for the initiation of subduction in the Scotia Sea Open Access

Teal R. Riley, Alex Burton-Johnson, Kelly A. Hogan, Andrew Carter, Philip T. Leat
Published: 14 June 2023
Journal of the Geological Society (2023) 180 (4): jgs2023-013.
DOI: https://doi.org/10.1144/jgs2023-013
...Fig. 1. Tectonic setting of the Scotia plate. BB, Bruce Bank; CDMC, Cordillera Darwin metamorphic complex; DB, Discovery Bank; HB, Herdman Bank; JB, Jane Bank; RVB, Rocas Verdes Basin; SFZ, Shackleton Fracture Zone; SOM, South Orkney microcontinent; SSIB, South Shetland Islands Block; SST, South...
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