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)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • 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)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Malusà M.G.[1]; Balestrieri M.L. [2] (literal)
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  • 221 (literal)
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  • 226 (literal)
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  • http://www.blackwell-synergy.com/servlet/useragent?func=showIssues&code=ter (literal)
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  • 24 (literal)
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  • 3 (literal)
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  • ISI Web of Science (WOS) (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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