Tectonic and sedimentary significance of Cretaceous Tekenika Beds of Tierra del Fuego

Dott, Robert H.; Winn, Robert D.; DeWit, Maarten; Bruhn, Ronald L.

doi:10.1038/266620a0

Cited by 40 publications

(35 citation statements)

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“…Although titanite precipitation could have occurred immediately or up to 20 my after the bioalteration processes, as noted in other ophiolitic complexes (Furnes et al, 2001), on the basis of mineralogical and textural evidence from metabasalts of the Tortuga Complex, it is thought that the titanite was probably precipitated soon after the mafic magmatism near the spreading/magmatic axis. This scenario supports the possibility that the oceanic-like crust of the Rocas Verdes basin was generated within a period of about 35 myr, during which the latest back-arc basin stage probably overlapped with the onset of the Aptian-Albian An- (Cunningham, 1994;Hervé and Fanning, 2003;Stern and de Wit, 2003;Fildani and Hessler, 2005;Calderón et al, 2007aCalderón et al, , 2007bCalderón et al, , 2007cCalderón et al, , 2012Maloney et al, 2011). dean orogeny in Tierra del Fuego (Dott et al, 1977) signaled by the deposition of the conglomerates of the Tekenika Beds. Thus, during the early phase of basin closure, which was probably related to changes in subduction parameters along a continental margin on the Pacific side and opening of the Atlantic Ocean, waning mafic back-arc magmatism was followed by underthrusting of the Rocas Verdes basin seafloor beneath the drifted magmatic arc.…”

Section: Aptian Upper Age Limit For Mafic Back-arc Magmatismsupporting

confidence: 61%

“…Thus, the age of the ophiolites is indirectly constrained as Tithonian to by biofacies associations in the overlying sedimentary successions (Fuenzalida and Covacevich, 1988;Suárez et al, 1985). The ophiolites underwent seafloor-type hydrothermal metamorphism (Stern et al, 1976;Elthon and Stern, 1978) and were subsequently buried and obducted onto the margin of South America during the ensuing phases of Andean orogenesis in the mid-Cretaceous (Katz and Watters, 1966;Dott et al, 1977;Dalziel, 1981;Cunningham, 1994;Fildani et al, 2003;Fosdick et al, 2011;Calderón et al, 2012). Granitoids consisting of hornblende-biotite tonalite, granodiorite, and restricted monzonite and monzodiorite (Katz and Watters, 1966;Godoy, 1978;Allen, 1982) intruding the ophiolite complexes are of earliest Late Cretaceous age (Hervé et al, 1984Cunningham, 1994;Calderón et al, 2012).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Petrological vestiges of the Late Jurassic-Early Cretaceous transition from rift to back-arc basin in southernmost Chile: New age and geochemical data from the Capitán Aracena, Carlos III, and Tortuga ophiolitic complexes

et al. 2013

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Section: Aptian Upper Age Limit For Mafic Back-arc Magmatismsupporting

confidence: 61%

Section: Geological Backgroundmentioning

confidence: 99%

Petrological vestiges of the Late Jurassic-Early Cretaceous transition from rift to back-arc basin in southernmost Chile: New age and geochemical data from the Capitán Aracena, Carlos III, and Tortuga ophiolitic complexes

et al. 2013

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“…The marginal basin assemblage includes basic tholeiitic rocks comparable to the upper part of an ophiolite (SAuNDERS et al, 1979;EL-~-~oN and RIDLEY, 1980), overlain by volcaniclastic turbidites and pyroclastic rocks representing the infill of this basin. Only in the latter sedimentary rocks a few fossils belonging to the Neocomian and possibly to the Aptian-Albian have been found (SuAR~z and PETTICREW, 1976;DOTT et al, 1977).…”

Section: Introductionmentioning

confidence: 96%

Basic magmas in the early evolution of the Southernmost Patagonian Batholith, Chile

Suárez¹,

Herve²,

Puig³

1985

Geol Rundsch

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With 3 figures ZusammenfassungBasische Magmen spielten eine bedeutende Rolle bei der friihen Entwicklung eines Abschnittes des Patagonischen Batholithen (141-34 Mio. J.), der s/.idlich Tierra del Fuego, Chile, aufgeschlossen ist. Der basische Magmatismus dauerte 40 bis etwa 60 Millionen Jahre (141-84 Mio. J.). Er besteht aus frfihen Gabbros und Hornblenditen (141-103 Mio. J.) und aus synplutonischen G~ingen und einigen der zahlreichen basischen Einschliisse in dem Granitkomplex der kretazischen Plutonit-Gruppe (113-84 Mio. J.). Einige der Einschlfisse werden als isolierte Anteile von synplutonischen G~ngen gedeutet.Die zur Verffigung stehenden Daten belegen, dai~ der basaltische bis rhyolitische Vulkanismus, der sich in diesem Gebiet w~ihrend der friihen Kreide ereignete, gleichzeitig mit dem hier vorgestellten basischen Magmatismus und in dessen letztem Stadium zusammen mit granitischen Magmen ereignete. Daher waren offensichtlich Gabbros an den Wurzeln des Inselbogens w~hrend der friihen Entwicklungsstadien beteiligt, w~ihrend Granotioide mit gr6igerem Anteil an dem sp~iterem Stadium des Wurzelsystems beteiligt waren. ResumenMagmas b~tsicos tuvieron un importante rol en la historia temprana del segmento det Batolito Patag6nico (141 a 34 M a) que se expone al sur de Tierra del Fuego, Chile. E1 magmatismo b~sico tuvo una duraci6n de unos 40 May hasta unos 60 Ma (141 a 84 Ma). Este magmatismo est~ representado por gabros y hornblenditas (141 a 103 Ma), por diques sinplut6nicos y por algunas de las numerosas inclusiones b~tsicas en los granitoides pertenecientes a un grupo plut6nico del Cret~cico (113 a 84 Ma). Algunas de las inclusiones se interpretan como partes de diques sinplut6nicos.La informaci6n existente permite indicar que el volcanismo bas~ltico y riol~tico que tuvo lugar en la regi6n, durante el Cretficico Inferior, rue contempor~meo con el magmatismo bfisico del que se informa en este artlculo. Aparentemente, la etapa final de este volcanismo habrla sido coetfineo con un importante magmatismo granltico. En consecuencia, aparentemente, en las etapas iniciales de la evoluci6n de la cadena volc~nica, los gabros habrlan constituldo parte de su ralz, mientras que posteriormente habrla habido mayor participaci6n de granitoides. Available data indicate that basaltic to rhyolitic volcanism which took place in the area during the Early Cretaceous was contemporaneous with the basic magmatism reported here and during its latest stage, with granitoid magmas. Therefore, gabbros apparently formed part of the roots of the island arc during the early stages of its evolution, whilst granitoids may have had a greater participation at a later stage in the root system. Abstract

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“…Deformed fossils indicate that shortening in the southernmost Andes had initiated by ∼100 Ma (Figure 14b) [Halpern and Rex, 1972;Dott et al, 1977]. The cause of the shift from rifting to compression is unknown, but commonly is attributed to changes in absolute plate motions and subduction dynamics as the South Atlantic Ocean opened during the Early Cretaceous [Dalziel, 1986;Jokat et al, 2003;Calderón et al, 2007].…”

Section: Continental Underthrusting and Obduction Of Quasi-oceanic Crustmentioning

confidence: 99%

“…The exact age of the transition from rifting to contraction is poorly known. Deformed fossils indicate that shortening initiated sometime after the Albian-Aptian [Halpern and Rex, 1972;Dott et al, 1977]. North of the Magellan Straits (Última Esperanza Region), deposition of the Upper Cretaceous Punta Barrosa Formation has been interpreted to mark the onset of thrusting and sedimentation into the Magallanes foreland basin [Biddle et al, 1986;Wilson, 1991;Fildani and Hessler, 2005;Olivero and Malumián, 2008].…”

Section: Rift Basin Inversion Collapse and Formation Of The Magallamentioning

confidence: 99%

Continental underthrusting and obduction during the Cretaceous closure of the Rocas Verdes rift basin, Cordillera Darwin, Patagonian Andes

et al. 2010

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The Patagonian Andes record a period of Cretaceous‐Neogene orogenesis that began with the compressional inversion of a Late Jurassic rift called the Rocas Verdes basin. Detrital zircon ages from sediment that filled the southern part of the basin provide a maximum depositional age of ∼148 Ma, suggesting that the basin opened approximately simultaneously along its length during the Late Jurassic. Structural data and U‐Pb isotopic ages on zircon from granite plutons near the Beagle Channel (55°S) show that basin inversion involved two stages of shortening separated by tens of millions of years. An initial stage created a small (∼60 km wide) thrust wedge that placed the basaltic floor of the Rocas Verdes basin on top of adjacent continental crust prior to ∼86 Ma. Structures and metamorphic mineral assemblages preserved in an exhumed middle to lower crustal shear zone in Cordillera Darwin suggest that this obduction was accompanied by south directed subduction of the basaltic crust and underthrusting of continental crust to depths of ∼35 km beneath a coeval volcanic arc. A subsequent stage of out‐of‐sequence thrusting, culminating in the Paleogene, shortened basement and Upper Jurassic igneous rock in the internal part of the belt by at least ∼50 km, forming a bivergent thrust wedge. This latter period coincided with the exhumation of rocks in Cordillera Darwin and expansion of the fold‐thrust belt into the Magallanes foreland basin. This orogen provides an important example of how orogenesis initiated and led to continental underthrusting and obduction of basaltic crust during closure of a quasi‐oceanic rift basin.

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Tectonic and sedimentary significance of Cretaceous Tekenika Beds of Tierra del Fuego

Cited by 40 publications

References 4 publications

Petrological vestiges of the Late Jurassic-Early Cretaceous transition from rift to back-arc basin in southernmost Chile: New age and geochemical data from the Capitán Aracena, Carlos III, and Tortuga ophiolitic complexes

Petrological vestiges of the Late Jurassic-Early Cretaceous transition from rift to back-arc basin in southernmost Chile: New age and geochemical data from the Capitán Aracena, Carlos III, and Tortuga ophiolitic complexes

Basic magmas in the early evolution of the Southernmost Patagonian Batholith, Chile

Continental underthrusting and obduction during the Cretaceous closure of the Rocas Verdes rift basin, Cordillera Darwin, Patagonian Andes

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