Dating Pleistocene deltaic deposits using in-situ 26Al and 10Be cosmogenic nuclides |
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| Institution: | 1. Department of Chemistry and Industrial Chemistry, University of Pisa, via Risorgimento 35, 56126 Pisa, Italy;2. Laboratory of Metals in Medicine, Department of Chemistry, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy;3. School of Chemistry, Cardiff University, Main Building, Park place, Cardiff CF10 3AT, United Kingdom;4. Department of Experimental and Clinical Medicine, University of Florence, Viale G.B. Morgagni 50, Florence, Italy;1. Department of Chemistry and Environmental Science, New Jersey, Institute of Technology, Newark, NJ 07012, United States;2. Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ 08901, United States;1. Department of Medical Oncology, University Campus Bio-Medico, Rome, Italy;2. Department of Experimental, Diagnostic and Speciality Medicine, Sant''Orsola Malpighi Hospital, University of Bologna, Bologna, Italy;3. Department of Oncology, San Bortolo Hospital, ULSS8 Berica–East District, Vicenza, Italy;4. Department of Medical Oncology, San Raffaele Scientific Institute, Milan, Italy;5. Department of Oncology, University of Turin Medical School/Piedmont Foundation for Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Italy;6. Medical Oncology Unit 1, Department of Clinical and Experimental Oncology, Istituto Oncologico Veneto IOV-IRCCS, Padua, Italy.;7. Unit of Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Via Roma 67, 56126, Italy;8. Medical Oncology, Hospital & University of Cagliari, Italy;9. Medical Oncology Unit, Cancer Institute ``Giovanni Paolo II'''', 70124 Bari, Italy;10. Medical Oncology Unit, ASST Bergamo Ovest, Piazzale Ospedale 1, 24047 Treviglio, Bergamo, Italy;11. Department of Oncology, University and General Hospital, Udine, Italy;12. Medical Oncology, Hospital of Macerata, Macerata, Italy & Medical Oncology, University of Cagliari, Italy;1. University of Pisa, Department of Civil and Industrial Engineering, Largo Lucio Lazzarino, 56122 Pisa, Italy |
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| Abstract: | The present study aims at testing the possibility of using the in-situ cosmogenic burial dating technique on deltaic deposits. The sequence analyzed is exposed along the Ligurian coast (north-west Italy) and is made of proximal marine and continental deposits previously considered Pliocene or Plio-Quaternary in age. In the study area two allostratigraphic units were recognized. The lower unit represents the evolution of a small coarse-grained delta developed in a fjord or embayment environment. The coarsening/shallowing upward trend observed within the sections, from bottom to top, suggests that the delta prograded rapidly in the landward portion of the canyon placed opposite to the paleo-river outlet. Within the deltaic sequence the transgressive and highstand system tracts were recognized. The unit 2 is composed by several alluvial fan systems deposited in small incised valleys developed within the previously, uplifted deltaic deposits and successively incised by a braided river system. In-situ produced cosmogenic nuclides were used in order to date the age of the deposition of the deltaic deposits. Results suggest that the studied deltaic sediments belonging to the unit 1 were deposited between 1,300,000 and 200,000 year ago thus during the Lower to Middle Pleistocene, whereas the unit 2 was deposited during the Middle Pleistocene as a consequence of a tectonically driven uplift phase. Furthermore samples collected within the prograding part of the delta show the higher denudation rates. The obtained results demonstrate that burial ages and related erosion rates inferred from cosmogenic nuclides concentrations can be considered as a very useful tool to reconstruct the sea level changes over the past 1 million year. |
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| Keywords: | Cosmogenic nuclides Burial dating Pleistocene Liguria Deltaic deposits |
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