Evidence for Cenozoic extensional basin development and tectonic inversion south of the flat-slab segment, southern Central Andes, Chile (33°–36°S.L.)

Charrier, Reynaldo; Baeza, Óscar; Elgueta, Sara; Flynn, John J.; Gans, Phillip B.; Kay, Suzanne Mahlburg; Muñoz, Nelson Vergara; Wyss, André R.; Zurita, Enrique

doi:10.1016/s0895-9811(02)00009-3

Cited by 267 publications

(349 citation statements)

References 33 publications

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“…The Oligocene was a period of generalized extension along the Andean axis, as seen in central and southern Chile. A volcano-tectonic basin was developed along the magmatic arc in Late Oligocene times (Godoy et al 1999;Charrier et al 2002). This extensional stage is recorded in the extra-Andean Patagonia as in the Somun Cura Massif with important flood basalts (Kay et al 2007).…”

Section: Beginning Of Chile-type Subductionmentioning

confidence: 97%

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

Ramos¹

2009

Geological Journal

230

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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Section: Beginning Of Chile-type Subductionmentioning

confidence: 97%

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

Ramos¹

2009

Geological Journal

230

139

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“…Traditionally the 1,300 to 1,900 m thick, folded lower section (Oligocene to early Miocene in age) has been mapped as the Abanico Formation or the equivalent Coya-Machalí Formation south of 34°S (Klohn, 1960;Aguirre, 1960;Thiele, 1980;Charrier et al, 2002Charrier et al, , 2005, whereas the upper unconformable subhorizontal volcanic rocks (1,300 to 3,000 m thick) are considered to be part of the Farellones Formation (Charrier et al, 2002). In fact, a progressive unconformity (time-transgressive) separates these units and the K-Ar ages of the two volcanic units overlap between 22 and 16 Ma (Nyström et al, 2003;Charrier et al, 2002Charrier et al, , 2005Charrier et al, , 2007. The volcanism of the Principal Andean Cordillera of central Chile appears to have initially developed during the Eocene-Oligocene under an extensional tectonic regime (Charrier et al, 2002).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…In fact, a progressive unconformity (time-transgressive) separates these units and the K-Ar ages of the two volcanic units overlap between 22 and 16 Ma (Nyström et al, 2003;Charrier et al, 2002Charrier et al, , 2005Charrier et al, , 2007. The volcanism of the Principal Andean Cordillera of central Chile appears to have initially developed during the Eocene-Oligocene under an extensional tectonic regime (Charrier et al, 2002). However, during the Miocene, volcanic activity took place simultaneously with compressive pulses of the Quechua tectonic phase and related crustal shortening.…”

Section: Geological Frameworkmentioning

confidence: 99%

Fission track thermochronology of Neogene plutons in the Principal Andean Cordillera of central Chile (33-35°S): Implications for tectonic evolution and porphyry Cu-Mo mineralization

Maksaev

Munizaga

Zentilli

et al. 2009

AndGeo

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AbStRACt. Apatite fission track data for Miocene plutons of the western slope of the Principal Andean Cordillera in central Chile (33-35°S) define a distinct episode of enhanced crustal cooling through the temperature range of the apatite partial annealing zone (~125-60°C) from about 6 to 3 Ma. This cooling episode is compatible with accelerated exhumation of the plutons at the time of Pliocene compressive tectonism, and mass wasting on the western slope of the Principal Andean Cordillera in central Chile. The timing coincides with the southward migration of the subducting Juan Fernández Ridge and the development of progressive subduction flattening northward of 33°S. It also corresponds to the time of active magmatic-hydrothermal processes and rapid unroofing of the world class Río Blanco-Los Bronces and El Teniente porphyry Cu-Mo deposits. Zircon fission track ages coincide with previous 40 Ar/ 39 Ar dates of the intrusions, and with some of the apatite fission track ages, being coherent with igneous-linked, rapid cooling following magmatic intrusion. The thermochronologic data are consistent with a maximum of about 8 km for Neogene exhumation of the plutons.

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“…One of the clearest examples of tectonic reactivation is the nucleation of reverse fault from existing normal faults in continental margins, which is known as the process of positive tectonic inversion (Letouzey 1990). The inversion of deformational structures has been recognized in intracontinental domains (for example Ziegler 1983, Letouzey 1990, Charrier et al 2002, Cunningham 2005, 2013, in active continental margins, and in collisional environments (Ziegler 1983, Butler et al 2006, Dhahri & Boukadi 2010. This process is well recorded in sectors that undergo several superimposed subsidence pulses, in areas where compression has affected a stratigraphic pile deposited in an extensional environment or even in reverse shear zones that were reactivated as normal ones (negative inversion) (Allmendinger et al 1983, Jolivet et al 1991, Faccenna et al 1995.…”

Section: Introductionmentioning

confidence: 96%

“…Most deformation imprinted on old continental blocks is accommodated with reactivation of pre-existing structures (Charrier et al 2002, Butler et al 2006, Cunningham 2005, 2013. One of the clearest examples of tectonic reactivation is the nucleation of reverse fault from existing normal faults in continental margins, which is known as the process of positive tectonic inversion (Letouzey 1990).…”

Section: Introductionmentioning

confidence: 99%

Tectonic inversion of compressional structures in the Southern portion of the Paramirim Corridor, Bahia, Brazil

et al. 2015

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ABSTRACT:The Paramirim Corridor represents the maximum inversion zone of the Paramirim Aulacogen. Reverse-to-reverse dextral shear zones and various types of folds dominate such corridor. These structures reflect a stress field that is WSW-ENE oriented, developed in units of Aulacogen basement, as well as in the Lagoa Real Intrusive Suite, of Statherian age, in Espinhaço and São Francisco supergroups, of Statherian-Tonian and Cryogenian ages, respectively, and in the Macaúbas-Santo Onofre Group, of Tonian age at the most. A rich collection of extensional structures truncate compressional structures of the Paramirim Corridor, characterized by normal shear zones and foliation, which is sometimes mylonitic, down-dip stretching lineation, drag folds, traction fractures and S/C structures. In these shear zones, quartz occurs truncated by the foliation, while feldspars are fractured and altered to white mica. Distribution of the quartz c-axes is at a maximum of 14° from the Z-axis. Thus, it suggests that the deformation activated mainly the basal glide planes in the direction. The paleostress study using the Win-Tensor software demonstrated that the regimen ranged between radial and pure distention. The S 1 direction oscillated around a vertical trend, while s 3 was sub-horizontal, with a predominant N230-050° direction. Ar-Ar ages in biotite obtained from the extensional shear zones ranged from 480 and 490 Ma. Together, data obtained for the structures associated with the late extensional regimen described in the present study suggest that its nucleation is associated with distal and brittle-ductile sectors of the gravitational collapse zone of Araçuaí-West Congo Orogen.KEYWORDS: Shear Zone; Paramirim Corridor; Gravitational Collapse. RESUMO: O Corredor do Paramirim representa a zona de máxima inversão do Aulacógeno do Paramirim, no qual predominam zonas de cisalhamento reversas-reversas destrais e vários tipos de dobras. Essas estruturas refletem um campo de tensão segundo WSW-ENE, os quais se desenvolvem nas unidades de embasamento do Aulacógeno, assim como na Suíte Intrusiva Lagoa Real, de idade estateriana, nos supergrupos Espinhaço e São Francisco, de idades estateriana-toniana e criogeniana, respectivamente, bem como no grupo Macaúbas-Santo

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Evidence for Cenozoic extensional basin development and tectonic inversion south of the flat-slab segment, southern Central Andes, Chile (33°–36°S.L.)

Cited by 267 publications

References 33 publications

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

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

Fission track thermochronology of Neogene plutons in the Principal Andean Cordillera of central Chile (33-35°S): Implications for tectonic evolution and porphyry Cu-Mo mineralization

Tectonic inversion of compressional structures in the Southern portion of the Paramirim Corridor, Bahia, Brazil

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