Jurassic Cretaceous Palaeogeographic Evolution of the Chilean Andes at 23°–24°S Latitude and 34°–35°S Latitude: A Comparative Analysis

Charrier, Reynaldo; Muñoz, Nelson Vergara

doi:10.1007/978-3-642-77353-2_16

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…From 308S southwards the distribution of the marine deposits accumulated during the second stage forms two clearly separated depositional areas: one in the Coastal Cordillera, and the other in the Principal Cordillera, and mostly on its eastern side (Charrier 1984;Charrier & Mun ˜oz 1994;Charrier et al 2007). The two basins are separated from each other by a volcanic domain that we propose to name the Lo Prado volcanic arc.…”

Section: Second Stage (Kimmeridgian -Albian)mentioning

confidence: 94%

“…At the end of the first Andean stage, a major plate reorganization associated with a great increase in generation of oceanic crust in the proto-Pacific (Larson 1991) and rapid westward drift of South America modified the tectonic conditions in the continental margin of South America. This geodynamic event, known as the Peruvian orogeny (Steinmann 1929; see also Groeber 1951;Charrier & Vicente 1972;Vicente et al 1973;Ramos 1988bRamos , 2010Reutter 2001;Tunik et al 2010), caused along western South America uplift of the continental margin, the marine regression referred above and definite emersion in the backarc basin, compressive deformation of the existing units, and crustal thickening. As a result of this phase, the first Andean mountain range was formed.…”

Section: Second Stage (Kimmeridgian -Albian)mentioning

confidence: 99%

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Tectono-stratigraphic evolution of the Andean Orogen between 31 and 37°S (Chile and Western Argentina)

Charrier

Ramos

Tapia

et al. 2014

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In this classic segment, many tectonic processes, like flat-subduction, terrane accretion and steepening of the subduction, among others, provide a robust framework for their understanding. Five orogenic cycles, with variations in location and type of magmatism, tectonic regimes and development of different accretionary prisms, show a complex evolution. Accretion of a continental terrane in the Pampean cycle exhumed lower to middle crust in Early Cambrian. The Ordovician magmatic arc, associated metamorphism and foreland basin formation characterized the Famatinian cycle. In Late Devonian, the collision of Chilenia and associated high-pressure/low-temperature metamorphism contrasts with the late Palaeozoic accretionary prisms. Contractional deformation in Early to Middle Permian was followed by extension and rhyolitic (Choiyoi) magmatism. Triassic to earliest Jurassic rifting was followed by subduction and extension, dominated by Pacific marine ingressions, during Jurassic and Early Cretaceous. The Late Cretaceous was characterized by uplift and exhumation of the Andean Cordillera. An Atlantic ingression occurred in latest Cretaceous. Cenozoic contraction and uplift pulses alternate with Oligocene extension. Late Cenozoic subduction was characterized by the Pampean flat-subduction, the clockwise block tectonic rotations in the normal subduction segments and the magmatism in Payenia. These processes provide evidence that the Andean tectonic model is far from a straightforward geological evolution.

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Section: Second Stage (Kimmeridgian -Albian)mentioning

confidence: 94%

Section: Second Stage (Kimmeridgian -Albian)mentioning

confidence: 99%

Tectono-stratigraphic evolution of the Andean Orogen between 31 and 37°S (Chile and Western Argentina)

Charrier

Ramos

Tapia

et al. 2014

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“…For the Pacific Chilean margin, Å berg et al (1984) postulate the existence of an aborted marginal basin generated as the outcome of that tectonic regime, whereas Charrier and Muñoz (1994) and Vergara et al (1995) propose an intra-arc basin. Volcanic rocks dominate in the central part of the basin (Veta Negra Formation), whereas sedimentary rocks predominate to the north (the Arqueros Formation) and south (Å berg et al, 1984) of the basin.…”

Section: Tectonic Setting and Conditions Of Emplacement Of The Lower mentioning

confidence: 98%

“…An ensialic marginal basin or intra-arc subsiding basin formed by extension and progressive crustal attenuation has been proposed as the setting for the Lower Cretaceous in central Chile (Levi and Aguirre, 1981;Levi and Nyström, 1982;Å berg et al, 1984;Charrier and Muñoz, 1994;Vergara et al, 1995). This geodynamic setting, which differs from that of modern Andean magmatism, accounts for the unique geochemical characteristics of Lower Cretaceous volcanism in the Coastal Range (Vergara et al, 1995).…”

Section: Introductionmentioning

confidence: 96%

Extensional Lower Cretaceous volcanism in the Coastal Range (29°20′–30°S), Chile: geochemistry and petrogenesis

Morata

Aguirre

2003

Journal of South American Earth Sciences

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The tectonic regime along the Andes: Present‐day and Mesozoic regimes

Ramos¹

2009

Geological Journal

217

139

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The analyses of the main parameters controlling the present Chile-type and Marianas-type tectonic settings developed along the eastern Pacific region show four different tectonic regimes: (1) a nearly neutral regime in the Oregon subduction zone; (2) major extensional regimes as the Nicaragua subduction zone developed in continental crust; (3) a Marianas setting in the Sandwich subduction zone with ocean floored back-arc basin with a unique west-dipping subduction zone and (4) the classic and dominant Chile-type under compression. The magmatic, structural and sedimentary behaviours of these four settings are discussed to understand the past tectonic regimes in the Mesozoic Andes based on their present geological and tectonic characteristics. The evaluation of the different parameters that governed the past and present tectonic regimes indicates that absolute motion of the upper plate relative to the hotspot frame and the consequent trench roll-back velocity are the first order parameters that control the deformation. Locally, the influences of the trench fill, linked to the dominant climate in the forearc, and the age of the subducted oceanic crust, have secondary roles. Ridge collisions of seismic and seismic oceanic ridges as well as fracture zone collisions have also a local outcome, and may produce an increase in coupling that reinforces compressional deformation. Local strain variations in the past and present Andes are not related with changes in the relative convergence rate, which is less important than the absolute motion relative to the Pacific hotspot frame, or changes in the thermal state of the upper plate. Changes in the slab dip, mainly those linked to steepening subduction zones, produce significant variations in the thermal state, that are important to generate extreme deformation in the foreland.

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Jurassic Cretaceous Palaeogeographic Evolution of the Chilean Andes at 23°–24°S Latitude and 34°–35°S Latitude: A Comparative Analysis

Cited by 9 publications

References 7 publications

Tectono-stratigraphic evolution of the Andean Orogen between 31 and 37°S (Chile and Western Argentina)

Tectono-stratigraphic evolution of the Andean Orogen between 31 and 37°S (Chile and Western Argentina)

Extensional Lower Cretaceous volcanism in the Coastal Range (29°20′–30°S), Chile: geochemistry and petrogenesis

The tectonic regime along the Andes: Present‐day and Mesozoic regimes

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