http://www.cnr.it/ontology/cnr/individuo/prodotto/ID187526
Burial and exhumation across the Alps-Apennines junction zone constrained by fission-track analysis on modern river sands. (Articolo in rivista)
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- Burial and exhumation across the Alps-Apennines junction zone constrained by fission-track analysis on modern river sands. (Articolo in rivista) (literal)
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- 2012-01-01T00:00:00+01:00 (literal)
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Malusà M.G.[1]; Balestrieri M.L. [2] (2012)
Burial and exhumation across the Alps-Apennines junction zone constrained by fission-track analysis on modern river sands.
in TERRA nova (Print); WILEY-BLACKWELL, 111 RIVER ST, HOBOKEN 07030-5774, NJ (Stati Uniti d'America)
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- Malusà M.G.[1]; Balestrieri M.L. [2] (literal)
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- [1] Department of Geological Sciences and Geotechnologies, University of Milano-Bicocca, Milan, Italy;
[2] Institute of Geosciences and Earth Resources, National Research Council, Florence, Italy (literal)
- Titolo
- Burial and exhumation across the Alps-Apennines junction zone constrained by fission-track analysis on modern river sands. (literal)
- Abstract
- 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 Ma-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. (literal)
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