The Scotia Arc and Antarctic Margin

Dalziel, Ian W. D.; Elliot, David H.

doi:10.1007/978-1-4684-3030-1_5

Cited by 68 publications

(58 citation statements)

References 54 publications

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“…On the South American side, the rifting episode is evident from the Guyana shield to the southern extremity of the cratonic platform of Argentina (Almeida, 1972) and the Scotia arc (Dalziel and Elliot, 1972). During this episode, which began in the Late Jurassic and ended in the Aptian/Albian on the Brazilian margin, large Precambrian faults were reactivated and new faults appeared.…”

Section: South American Marginmentioning

confidence: 99%

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Early Evolution of the South Atlantic Ocean: Role of the Rifting Episode

Sibuet¹,

Hay²,

Prunier³

et al. 1984

Initial Reports of the Deep Sea Drilling Project

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For the South Atlantic Ocean, the rifting period began during the Oxfordian-Kimmeridgian and ended progressively from the Hauterivian near the Agulhas Plateau to the early Albian in the vicinity of the Niger Delta. The Walvis Ridge/Rio Grande Rise system acted as a dam to marine incursions into the Angolan and Brazilian basins until the midAptian. The Parana Basin and the Torres syncline (Brazil), the Eastern Walvis Ridge and the Kaokoveld region (Namibia) form an originally continuous volcanic terrane created in the continental domain during the Late Jurassic-Early Cretaceous by tensional processes. This terrane corresponds to a failed rift arm extending into South America and involving about 100 km of extension in the Late Jurassic to Early Cretaceous. These factors provide new constraints for the early kinematic evolution of the South Atlantic.

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Section: South American Marginmentioning

confidence: 99%

“…They were created and filled with sediments during the Early Cretaceous (Zambrano and Urien, 1970). Farther south, the Magellanes Basin in Patagonia also contains Upper Jurassic-Lower Cretaceous marine sediments (Dalziel and Elliot, 1972).…”

Section: South American Marginmentioning

confidence: 99%

Early Evolution of the South Atlantic Ocean: Role of the Rifting Episode

Sibuet¹,

Hay²,

Prunier³

et al. 1984

Initial Reports of the Deep Sea Drilling Project

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“…This geographic for a later Permian age in eastern Australia (Brown et al 1968). In view of dating uncertainties and the likelihood of age variation from J;llace to place, we use the local name Weddell orogeny (Ford 1972a) to identify this event in the Pensacola Mountains, rather than the name Gondwanian orogeny (Dalziel & Elliot 1973;Elliot 1975). This follows the practice of using the local names Cape orogeny in South Africa (Dingle & Scrutton 1974) and Hunter-Brown orogeny in Australia (Brown et al 1968), although both are part of the general Gondwanide event.…”

Section: Dikes Of Cordiner Peaksmentioning

confidence: 99%

“…Elliot's (1975; suggestion that Ferrar rocks of the Transantarctic Mountains are related to backarc extension associated with subduction during the Gondwanide orogeny along the Pacific margin may plausibly account for the distinctive geochemical nature of the belt. However, this hypothesis requires explanations for: (1) close age correspondence, if other than fortuitous, between this belt and tholeiites of entirely different rift origin in Queen Maud Land and South Africa; (2) the apparent absence of a similarly distinctive terrane in other areas where the Gondwanide event is recorded, as in Madre de Dios basin of southern South America (Dalziel & Elliot 1973) Barron et al (1978). (A-Antarctic Peninsula; B-Beardmore Glacier area; EEllsworth Mountains; P-Pensacola Mountains; Q-Queen Maud Land; R-Ross Sea; TTheron Mountains; V-Victoria Land.)…”

Section: Transantarctic Mountains-a Jurassic Failed Rift?mentioning

confidence: 99%

“…fold belt near the Karroo province; and (3) the remarkable homogeneity of magma compositions along a 3000-km-long belt, if related to orogenic processes that are typically non uniform and possibly age variable along trend. Dalziel & Elliot (1973) suggest a Late? Triassic age for the orogeny, but if it were older, possibly Early Triassic (Barrett et al 1972), a considerable time delay of 3Q....40 m.y, seems to be indicated between orogeny and Ferrar magmatism.…”

Section: Transantarctic Mountains-a Jurassic Failed Rift?mentioning

confidence: 99%

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K—Ar age, composition, and origin of Mesozoic mafic rocks related to Ferrar Group, Pensacola Mountains, Antarctica

Ford

Kistler

1980

New Zealand Journal of Geology and Geophysics

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A variety of mafic igneous bodies, including the unusually large, differentiated, layered gabbroic Dufek intrusion, and basalt and dolerite dikes and sills, intrude a Permian and older sequence in the Pensacola Mountains, near Weddell Sea, Antarctica. K-Ar age determinations show that the sills (179 ± 5 m.y.), the Dufek intrusion (172 ± 4 m.y.), and probably the dikes (minimum age 169 ± 4 m.y.) were emplaced over a narrow time interval in

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Kinematic Evolution of the Southern Andean Orogenic Arc

Maffione

2016

Geodynamic Evolution of the Southernmost Andes

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In the classic book 'Origin of Continents and Oceans' written 40 years before the plate tectonics theory was postulated, Alfred Wegener suggested that map-view curvatures in orogenic belts were the result of the motion of continents. In the mid-1950s, Carey coined the term 'orocline' to indicate a curved mountain belt formed by secondary bending of an originally straight orogen. Oroclines are genetically different from primary arcs, which are curved mountain belts whose curvature is primary and not due to secondary tectonic processes. A typical example of curved mountain belt is the southernmost segment of the Andean Cordillera, where the regional N-S trend of the Patagonian Andes sharply changes to ESE-WNW in the Fuegian Andes south of 53°S. Given the complex tectonic history of this region and the paucity of geological constraints, the nature, timing of deformation, and kinematics of formation of this orogenic bend have long been debated since its first definition by Carey as 'Patagonian orocline.' The dispute revolves around the question whether the southernmost Andes is an orocline or a primary arc. Implications for both options are significant and directly related to the understanding of fundamental tectonic processes operating at plate boundaries. More specifically, unraveling the tectonic evolution of the curved segment of the southernmost Andes is key to understand the geodynamic evolution of this region and the complex interaction between South America, Scotia, and Antarctica plates. Based on paleomagnetic, structural, and magnetic fabric data gathered in the last four decades, the orogenic curvature of the southernmost Andes does not specifically fit in any of the classic definitions of curved mountain belts, as it rather represents a 'hybrid' curved belt. While the outer side of the curvature (inner structural domains) seems to represent an orocline (or a progressive arc), the inner part of the curvature (external structural domains) developed as a primary arc throughout the Cenozoic. For this reason, the more generic term of 'Patagonian Arc' has recently been proposed as a more suitable name to describe the curved segment of the southernmost Andes. While oroclinal bending of the external part of the arc is generally associated with the closure of the Rocas Verdes marginal basin

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The Scotia Arc and Antarctic Margin

Cited by 68 publications

References 54 publications

Early Evolution of the South Atlantic Ocean: Role of the Rifting Episode

Early Evolution of the South Atlantic Ocean: Role of the Rifting Episode

K—Ar age, composition, and origin of Mesozoic mafic rocks related to Ferrar Group, Pensacola Mountains, Antarctica

Kinematic Evolution of the Southern Andean Orogenic Arc

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