PUMA
Istituto di Geoscienze e Georisorse     
Malusą M., Balestrieri M. Burial and exhumation across the Alps-Apennines junction zone constrained by fission-track analysis on modern river sands. In: Terra Nova, vol. 24 (3) pp. 221 - 226. Wiley, 2012.
 
 
Abstract
(English)
We applied fission-track analysis on modern river sands to constrain the Cenozoic evolution of the Alps-Apennines junction zone. West of the Villalvernia-Varzi-Ottone fault, samples yielded major peaks at 33-36 and 62-65 Ma, showing that apatites in the eroded wedge-top successions were largely unreset. To the east, samples yielded prominent peaks at 4.0-4.7, 6.5-6.7 and 19 Ma, probably formed by reset ages. Our results indicate that the Alpine orogenic wedge originally tapered out to the south. The Northern Apennines were buried beneath a thick and widespread Epiligurian cover, now almost completely eroded, and experienced major uplift and erosional exhumation since early Pliocene times, at average rates of 1 km Maāˆ’1. A large amount of Alpine-derived detritus, previously stored on top of the orogenic wedge, was transferred into the Po Plain. Sediment recycling thus overwhelmed any eventual effect of climate change on Plio-Quaternary sedimentation rates south of the Alps.
URL: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3121
Subject Italy
Alps-Apennines junction
tectonic evolution
modern river sands
fission-track analysis


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