The early stages of the Alpine collision: an image derived from the upper Eocene–lower Oligocene record in the Alps–Apennines junction area

Carrapa, Bárbara; Giulio, Andrea Di; Wijbrans, J. R.

doi:10.1016/j.sedgeo.2004.05.015

Cited by 34 publications

(48 citation statements)

References 44 publications

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“…Recently, based on 39 Ar-40 Ar dating on phengites from the LTC metasediments, Federico et al (2005) constrained the syn-greenschist retrogressive metamorphism to the Early Oligocene (c. 33 Ma). These age data overlap with the depositional age of the Pianfolco Formation of the TPB, defined as no older than 33 ± 1.4 Ma, based on the same dating methodology applied to phengites separated from conglomeratic clasts (Carrapa et al 2004). It follows that exhumation of the LTC was synchronous with the early stages of sedimentation in the TPB (see also stratigraphic data in Charrier et al 1964;Franceschetti 1967).…”

Section: Tectonic Interpretationmentioning

confidence: 64%

Retrogressive fabric development during exhumation of the Voltri Massif (Ligurian Alps, Italy): arguments for an extensional origin and implications for the Alps–Apennines linkage

Vignaroli

Faccenna

Rossetti

2008

Int J Earth Sci (Geol Rundsch)

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Geological mapping coupled with structural investigations carried out in the Voltri Massif (eastern Ligurian Alps, Italy) provide new data for the interpretation of the tectonic context controlling main fabric development during exhumation of its high-pressure core. The Voltri Massif is here interpreted as a c. 30 km-long eclogitebearing, asymmetric dome formed by the progressive verticalisation of the regional, second-phase mylonitic foliation developed during retrogressive greenschist metamorphic conditions. In this light, the exhumation history is driven by a ductile-to-brittle extensional process, operating through low-angle, top-to-the-W multiple detachment systems. A Late Eocene-Early Oligocene age for this extensional episode is proposed on the basis of structural correlations, stratigraphic and radiometric constraints. In this scenario, the Voltri Massif is interpreted as an extensional domain developed to accommodate the Late Eocene-Early Oligocene arching of the Western AlpsNorthern Apennines orogenic system.

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Section: Tectonic Interpretationmentioning

confidence: 64%

Retrogressive fabric development during exhumation of the Voltri Massif (Ligurian Alps, Italy): arguments for an extensional origin and implications for the Alps–Apennines linkage

Vignaroli

Faccenna

Rossetti

2008

Int J Earth Sci (Geol Rundsch)

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“…However, the ages recorded by Miocene through Quaternary foreland basin deposits in the frontal Himalaya are >1000 Ma to <12 Ma [ Szulc et al , 2006; White et al , 2002]. A similarly wide spread of ages is observed in other collisional systems such as in the Alps, where the exhumation record is a result of erosion of different nappes that underwent multiple tectono‐thermal events [e.g., Carrapa et al , 2004].…”

Section: Discussionmentioning

confidence: 99%

“…The distribution of detrital cooling and crystallization ages has been used successfully in several studies for provenance discrimination and to determine timing of major tectonics events [e.g., Copeland and Harrison , 1990; Najman et al , 1997; White et al , 2002; Carrapa et al , 2003; Gehrels et al , 2003; DeCelles et al , 2007; Ruhl and Hodges , 2005; Carrapa , 2010]. In particular, detrital geothermochronology of river sands has proven to well represent the regional signature of the source areas [e.g., Carrapa et al , 2004].…”

Section: A Geothermochronologic Approach To Resolve Exhumation and Tementioning

confidence: 99%

Miocene exhumation of the Pamir revealed by detrital geothermochronology of Tajik rivers

et al. 2012

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[1] The Pamir mountains are the western continuation of the Tibetan-Himalayan system, the largest and highest orogenic system on Earth. Detrital geothermochronology applied to modern river sands from the western Pamir of Tajikistan records the history of sediment source crystallization, cooling, and exhumation. This provides important information on the timing of tectonic processes, relief formation, and erosion during orogenesis. U-Pb geochronology of detrital zircons and 40 Ar/ 39 Ar thermochronology of white micas from five rivers draining distinct tectonic terranes in the western Pamir document Paleozoic through Cenozoic crystallization ages and a Miocene (13-21 Ma) cooling signal. Detrital zircon U-Pb ages show Proterozoic through Cenozoic ages and affinity with Asian rocks in Tibet. The detrital 40 Ar/ 39 Ar data set documents deep and regional exhumation of the Pamir mountains >30 Myr after Indo-Asia collision, which is best explained with widespread erosion of metamorphic domes. This exhumation signal coincides with deposition of over 6 km of conglomerates in the adjacent foreland, documenting high subsidence, sedimentation, and regional exhumation in the region. Our data are consistent with a high relief landscape and orogen-wide exhumation at $13-21 Ma and correlate with the timing of exhumation of the Pamir gneiss domes. This exhumation is younger in the Pamir than that observed in neighboring Tibet and is consistent with higher magnitude Cenozoic deformation and shortening in this part of the orogenic system.

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“…This early Oligocene event is also detected through a strong elevation of the axial Alpine orogen, which is suspected considering the increase in sediment budget in the northern and western forelands (Kuhlemann, 2000;Kempf & Pross, 2005;Morag et al 2008;Bernet and Tricart, 2010) leading to basins overfill and to the transition from flysch to molasse sedimentation. An other evidence is provided by the onset of coarse sedimentation in Lombardy and Piedmont, interpreted as a consequence of rapid unroofing in Western and Central Alps (Giger & Hurford, 1989;Carrapa et al, 2004). From early Oligocene onwards, one can observe a dramatic discrepancy between (i) the rapidly exhuming axial chain, now represented by the Internal Zones, with exhumation and canibalization of the Eocene flexural basin with its initial overload in the French foreland, and (ii) rapid burial affecting the previously exposed Eocene HP wedge in the Italian Piedmont (Bertotti et al, 2006).…”

Section: The Early Oligocene Orogenmentioning

confidence: 99%

Structural and sedimentary records of the Oligocene revolution in the Western Alpine arc

Dumont

Schwartz

Guillot

et al. 2012

Journal of Geodynamics

101

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The early stages of the Alpine collision: an image derived from the upper Eocene–lower Oligocene record in the Alps–Apennines junction area

Cited by 34 publications

References 44 publications

Retrogressive fabric development during exhumation of the Voltri Massif (Ligurian Alps, Italy): arguments for an extensional origin and implications for the Alps–Apennines linkage

Retrogressive fabric development during exhumation of the Voltri Massif (Ligurian Alps, Italy): arguments for an extensional origin and implications for the Alps–Apennines linkage

Miocene exhumation of the Pamir revealed by detrital geothermochronology of Tajik rivers

Structural and sedimentary records of the Oligocene revolution in the Western Alpine arc

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