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Dating the topography through thermochronology: application of Pecube Code to inverted vertical profile in the Eastern Sila Massif, Southern Italy

Valerio Olivetti(1, 2), Maria Laura Balestrieri(3), Claudio Faccenna(2) & Fin Stuart(4)

1. Università di Roma Tre, Dip. Scienze, L.go S. L. Murialdo, 00146, Roma, Italy.
2. Aix-Marseille Université (AMU), IRD, CNRS, CEREGE UM34, BP 80, 13545 Aix-en-Provence, Cedex 4, France.
3. CNR, Istituto di Geoscienze e Georisorse, U.O.S. Firenze, via La Pira 4, 50121 Florence, Italy.
4. Isotope Geoscience Unit, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UK.

DOI: 10.3301/IJG.2016.09   Pages:

Abstract

The Sila Massif is a small part of an orogenic wedge that sits on top of the narrow and active Calabrian subduction zone. The topography of the Sila Massif is characterized by a plateau region whose age and origin has been long-time debated. Here we integrate new apatite (U-Th)/He data from the eastern flank of the massif with existing apatite fission-track (AFT) data, to constrain the topographic evolution of the massif. The new AHe ages range from 9.7 Ma to 49.8 Ma and overlap
the AFT ages indicating that a phase of rapid Cenozoic exhumation was followed by an abrupt decrease of the exhumation rate. A steep/inverse AFT age-elevation relationship from a vertical profile on top of the summit area of the north-eastern Sila may records post-exhumation relief degradation, which is consistent with the low-relief upland topography. To test this hypothesis we
performed inverse numerical modeling using Pecube code. Integrating the new AHe ages and the numerical modelling results with the geological constraints we propose a new model for the regional topographic evolution from 30 Ma to the present.

Keywords

(U-Th)/He thermochronology, Calabrian Arc, Pecube, Topography evolution.

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ITALIAN JOURNAL OF GEOSCIENCES

The official journal of the Italian Geological Society (Società Geologica Italiana) and of the Italian Geological Survey.

 

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