Thermochronological constraints on the multiphase exhumation history of the Ivrea-Verbano Zone of the Southern Alps

Wolff, Reinhard; Dunkl, İstván; Kiesselbach, G.; Wemmer, Klaus; Siegesmund, Siegfried

doi:10.1016/j.tecto.2012.03.019

Cited by 58 publications

(51 citation statements)

References 67 publications

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“…7). The U-Pb rutile ages are similar to or only slightly older than 160-170 Ma K-Ar biotite ages in Val Strona and Val d'Ossola (Siegesmund et al 2008;Wolff et al 2012; Fig. 7).…”

Section: Comparison With Previous Ivz Thermochronologymentioning

confidence: 55%

“…1). Units dated by other techniques that come from equivalent positions to our samples yielded Ar-Ar hornblende ages of ~210 Ma according to Siegesmund et al (2008) or ~240 Ma according to Boriani and Villa (1997), and K-Ar biotite ages of 160-170 Ma in Val Strona and Val d'Ossola (Siegesmund et al 2008;Wolff et al 2012). Our sample from Val d'Ossola (IVT-43) was collected between ~1 and 3 km from each of the three samples dated with rutile U-Pb geochronology by Smye and Stockli (2014) and Zack et al (2011).…”

Section: Thermochronology Of the Ivzmentioning

confidence: 69%

“…Siegesmund et al (2008) obtained K-Ar ages for biotite along the Val Strona transect, which decreased steadily towards deeper parts of the section from 228 ± 5 Ma at the CMB line to 156 ± 3 Ma at the Insubric line. Wolff et al (2012) presented biotite K-Ar ages for three samples from Val d'Ossola and the northernmost IVZ, which ranged from 163 ± 3 Ma and 184 ± 13 Ma, younger for a given NW-SE position than Siegesmund et al's (2008) K-Ar biotite ages in Val Strona to the south. K-Ar ages should, however, be treated with caution, as this technique does not allow testing of whether the dated mineral separate contains more than one mica generation, effectively resulting in mixed ages.…”

Section: Thermochronology Of the Ivzmentioning

confidence: 96%

“…The timing of tilting of the IVZ section to its current orientation is debated. It has been alternatively suggested that the tilting was largely achieved by the end of the Paleozoic (Boriani and Giobbi 2004), as a combined effect of Tethyan rifting and Alpine tectonics (Handy et al 1999;Wolff et al 2012), or mostly due to Alpine tectonics (e.g. Quick et al 2009).…”

Section: Geological Settingmentioning

confidence: 99%

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Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Ewing

Rubatto

Beltrando

et al. 2015

Contrib Mineral Petrol

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documented along the western margin of the Adriatic plate. The ~160 Ma age population postdates the activity of all known rift-related structures within the Adriatic margin, but coincides with extensive gabbroic magmatism and exhumation of sub-continental mantle to the floor of the Alpine Tethys, west of the Ivrea Zone. We propose that this ~160 Ma early post-rift age population records regional cooling following episodic heating of the distal Adriatic margin, likely related to extreme lithospheric thinning and associated advection of the asthenosphere to shallow levels. The partial preservation of the ~175 Ma age cluster suggests that the post-rift (~160 Ma) heating pulse was of short duration. The regional consistency of the data presented here, which is in contrast to many other thermochronometers in the IVZ, demonstrates the value of the rutile U-Pb technique for probing the thermal evolution of high-grade metamorphic terrains. In the IVZ, a significant decoupling between Zr-in-rutile temperatures and U-Pb ages of rutile is observed, with the two systems recording events ~120 Ma apart.

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“…7). The U-Pb rutile ages are similar to or only slightly older than 160-170 Ma K-Ar biotite ages in Val Strona and Val d'Ossola (Siegesmund et al 2008;Wolff et al 2012; Fig. 7).…”

Section: Comparison With Previous Ivz Thermochronologymentioning

confidence: 55%

Section: Thermochronology Of the Ivzmentioning

confidence: 69%

Section: Thermochronology Of the Ivzmentioning

confidence: 96%

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Ewing

Rubatto

Beltrando

et al. 2015

Contrib Mineral Petrol

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“…In these localized fault zones, the increased area/volume ratio of rock fragments together with fluid circulation favors high chemical reactivity, allowing retrograde processes to produce fault gouges composed of authigenic hydrosilicates such as illite. Thus, the formation time of the authigenic illite in a fault gouge, can be correlated with periods of motion along the fault and thus constrains the timing of faulting where favorable conditions for illite formation are present (e.g., Lyons and Snellenberg, 1971;Kralik et al, 1987;Wemmer, 1991;Solum et al, 2005;Haines et al, 2008;Zwingmann et al, 2010;Surace et al, 2011;Wolff et al, 2012;Bense et al, 2014). Bense et al (2014) suggested a concept to evaluate the timing of brittle deformation based on K-Ar illite fine-fraction ages from fault gouges, which are developed in non-sedimentary host rocks during retrograde cooling.…”

Section: Fault Gouge Dating and Interpretationmentioning

confidence: 99%

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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Rock uplift and erosion rate history of the Bergell intrusion from the inversion of low temperature thermochronometric data

Fox

Reverman

Herman

et al. 2014

Geochem. Geophys. Geosyst.

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The Bergell intrusion (European Alps) was one of the first locations where thermochronometry was used to resolve changes in erosion rate, yet, relating these changes to variations in climate or in local tectonics remains challenging. One approach that enables changes in erosion rate to be related to changes in climate or rock uplift rate is to utilize landscape evolution models, as topographic response to these forcing parameters is unique. Furthermore, low temperature thermochronometric systems have the potential to resolve topography through time and thus topographic response. We present new (U-Th)/He data for samples collected across 2 km of relief from the Bergell. The ages range from $2 to $16 Ma and define an age elevation with an apparent exhumation rate of 0.1 km/Myr. In order to infer erosion rates, we use a thermokinematic model to solve the heat equation in the crust, track material points through time and predict thermochronometric data. Paleo-topography and erosion rate are parameterized using the stream power model. We find that rock uplift rates were 0.4 km/Myr from $25 to $20 Ma and subsequently decreased to 0.05 km/Myr. This results in a gradual decrease in erosion rate from rates of 0.4 to 0.1 km/Myr. A recent increase in rock uplift rate at $4 Ma to $0.6 km/Myr is required to explain the youngest ages and high topographic relief.

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Thermochronological constraints on the multiphase exhumation history of the Ivrea-Verbano Zone of the Southern Alps

Cited by 58 publications

References 67 publications

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

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

Rock uplift and erosion rate history of the Bergell intrusion from the inversion of low temperature thermochronometric data

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