Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)

Steenken, André; Siegesmund, Siegfried; Wemmer, Klaus; Luchi, Mónica G. López de

doi:10.1016/j.jsames.2007.05.002

Cited by 59 publications

(85 citation statements)

References 47 publications

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“…K/Ar and Ar/Ar muscovite ages starting at 502 Ma were reported (Krol and Simpson 1999). Most of these micas are large muscovite-booklets from pegmatites and are considered to have a closure temperature significantly higher than 400°C (Willigers et al 2001;Steenken et al 2008). Therefore, it has to be invoked that the young zircon rims are the result of a hydrothermal alteration.…”

Section: Discussionmentioning

confidence: 99%

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Siegesmund

Steenken

Martino

et al. 2009

Int J Earth Sci (Geol Rundsch)

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The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean metamorphic episode were gained by Pb/Pb stepwise leaching (PbSL) experiments on two titanite and garnet separates. Results indicate that the metamorphic history recorded by Crd-free gneisses (M2) started in the latest Neoproterozoic/earliest Cambrian (553 and 543 Ma) followed by the M4 metamorphism at

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Section: Discussionmentioning

confidence: 99%

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Siegesmund

Steenken

Martino

et al. 2009

Int J Earth Sci (Geol Rundsch)

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“…In the Nogolí region, K-Ar biotite ages from basement samples yield Carboniferous ages (345-328 Ma; Steenken et al, 2008) and are older than illite finefraction ages. Except one sample, they overlap with extrapolated 100% 2M 1 illite ages within error.…”

Section: 2 Timing Of Faulting Constrained By K-ar Agesmentioning

confidence: 91%

“…14), yielding Devonian ages (380-350 Ma; Sims et al, 1998;Steenken et al, 2008) and Carbonifeous K-Ar fine fraction ages (345-299 Ma; Wemmer et al, 2011). The latter ages were taken from the San Luis Formation, represented by two belts of low-grade phyllites and quartz arenites, several kilometres to the north of the study area.…”

Section: 2 Timing Of Faulting Constrained By K-ar Agesmentioning

confidence: 99%

“…The latter ages were taken from the San Luis Formation, represented by two belts of low-grade phyllites and quartz arenites, several kilometres to the north of the study area. The former mentioned muscovite ages are interpreted to represent the last mylonitization event caused by the Achalian Orogenic Cycle before brittle deformation started (Sims et al, 1998;Steenken et al, 2008), whereas K-Ar fine fraction ages from the San Luis Formation are interpreted to coincide with deformation under ductile/brittle transition conditions and the end of ductile deformation . All illite grain-size fraction ages presented here are younger or, in case of extrapolated 100% 2M 1 ages, overlap within error with K-Ar and Ar/Ar cooling ages, supporting our interpretation.…”

Section: 2 Timing Of Faulting Constrained By K-ar Agesmentioning

confidence: 99%

“…For better view geochronometers are displayed in the x-axis. K-Ar muscovite and biotite data are taken from Steenken et al (2008) and Wemmer et al (2011). Black lines indicate individual ages, bars indicate overlapping error of individual ages.…”

Section: Implications For the Evolution Of The Sierra De San Luismentioning

confidence: 99%

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Exhumation history and landscape evolution of the Sierra de San Luis (Sierras Pampeanas, Argentina) - new insights from low - temperature thermochronological data

Bense

Costa

Oriolo

et al. 2017

andgeo

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ABSTRACT. This paper presents low-temperature thermochronological data and K-Ar fault gouge ages from the Sierra de San Luis in the Eastern Sierras Pampeanas in order to constrain its low-temperature thermal evolution and exhumation history. Thermal modelling based on (U-Th)/He dating of apatite and zircon and apatite fission track dating point to the Middle Permian and the Triassic/Early Jurassic as main cooling/exhumation phases, equivalent to ca. 40-50% of the total exhumation recorded by the applied methods. Cooling rates are generally low to moderate, varying between 2-10 °C/Ma during the Permian and Triassic periods and 0.5-1.5 °C/Ma in post-Triassic times. Slow cooling and, thus, persistent residence of samples in partial retention/partial annealing temperature conditions strongly influenced obtained ages. Thermochronological data indicate no significant exhumation after Cretaceous times, suggesting that sampled rocks were already at or near surface by the Cretaceous or even before. As consequence, Cenozoic cooling rates are low, generally between 0.2-0.5 °C/Ma which is, depending on geothermal gradient used for calculation, equivalent to a total Cenozoic exhumation of 0.6-1.8 km. K-Ar fault gouge data reveal long-term brittle fault activity. Fault gouge ages constrain the end of ductile and onset of brittle deformation in the Sierra de San Luis to the Late Carboniferous/Early Permian. Youngest K-Ar illite ages of 222-172 Ma are interpreted to represent the last illite formation event, although fault activity is recorded up to the Holocene. RESUMEN. Historia de la exhumación y evolución del paisaje de la sierra de San Luis (Sierras Pampeanas, Argentina)-nuevas perspectivas a partir de datos termocronológicos de baja temperatura. Esta contribución presenta datos de termocronología de baja temperatura y edades de illitas generadas en zonas de fallas de la sierra de San Luis, en las Sierras Pampeanas Orientales de Argentina, con el propósito de aportar al conocimiento de la historia de su exhumación y evolución termal de baja temperatura. El modelado termal basado en dataciones de (U-Th)/He, apatita, circón y trazas de fisión sugiere que las principales fases de exhumación y enfriamiento ocurrieron durante el Pérmico medio y Triásico/Jurásico inferior, contribuyendo con aproximadamente 40-50% de la exhumación total registrada por los métodos utilizados. Las tasas de enfriamiento son, en general, bajas a moderadas, variando entre 2-10 °C/Ma durante el Pérmico y Triásico y 0,5-1,5 °C/Ma después del este último período. El lento enfriamiento y la persistente residencia de las muestras analizadas en condiciones térmicas de retención parcial (partial annealing) ha influenciado notoriamente las edades obtenidas. Los datos termocronológicos indican que no ha habido una exhumación 276 Exhumation history and LandscapE EvoLution of thE siErra dE san Luis (siErras pampEanas, argEntina)... significativa después del Cretácico o incluso antes. Consecuentemente, las tasas de enfriamiento durante el Cenozoico, son bajas, ge...

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Multiple migmatite events and cooling from granulite facies metamorphism within the Famatina arc margin of northwest Argentina

et al. 2014

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The Famatina margin records an orogenic cycle of convergence, metamorphism, magmatism, and extension related to the accretion of the allochthonous Precordillera terrane. New structural, petrologic, and geochronologic data from the Loma de Las Chacras region demonstrate two distinct episodes of lower crustal migmatization. The first event preserves a counterclockwise pressure-temperature path in kyanite-K-feldspar pelitic migmatites that resulted in lower crustal migmatization via muscovite dehydration melting at ∼12 kbar and 868 • C at 461 ± 1.7 Ma. The shape of the pressure temperature path and timing of metamorphism are similar to those of regional midcrustal granulites and suggest pervasive Ordovician migmatization throughout the Famatina margin. One-dimensional thermal modeling coupled with regional isotopic data suggests Ordovician melts remained at temperatures above their solidus for 20-30 Ma following peak granulite facies metamorphism, throughout a time period marked by regional oblique convergence. The onset of synconvergent extension occurred only after regional migmatites cooled beneath their solidus and was synchronous with the cessation of Precordillera terrane accretion at ∼436 Ma. The second migmatite event was regionally localized and occurred at ∼700 • C and 12 kbar between 411 and 407 Ma via vapor saturated melting of muscovite. Migmatization was synchronous with extension, exhumation, and strike-slip deformation that likely resulted from a change in the plate boundary configuration related to the convergence and collision of the Chilenia terrane.

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Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)

Cited by 59 publications

References 47 publications

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Exhumation history and landscape evolution of the Sierra de San Luis (Sierras Pampeanas, Argentina) - new insights from low - temperature thermochronological data

Multiple migmatite events and cooling from granulite facies metamorphism within the Famatina arc margin of northwest Argentina

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