Combined glacio-eustatic forcing and volcano-tectonic uplift: Geomorphological and geochronological constraints on the Tiber River terraces in the eastern Vulsini Volcanic District (central Italy)

F. Marra, L. Costantini, G. M. Di Buduo, F. Florindo, B. R. Jicha, L. Monaco, D. M. Palladino, G. Sottili

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

In the present paper, we analyze the regional interplay between glacio-eustasy and volcano-tectonic uplift on the Tyrrhenian Sea margin of central Italy. We reconstruct a succession of fluvial terraces in the Tiber River Valley east of the Vulsini Volcanic District and we provide geochronologic constraints allowing for correlation with the sea-level highstands of the Marine Isotope Stage timescale. Results of this study show that glacio-eustatic forcing affected the hydrographic network of the Tiber River, as far as 70 km inland with respect to the present Tyrrhenian coast, consistent with a regional uplift on the order of several tens of meters that affected this region over the last 250 ky. Using six new 40Ar/39Ar dates, we demonstrate the synchronicity between sea-level rise during glacial termination IV and the deposition of a fining-upward sedimentary succession of the Paleo-Tiber River in this area. A detailed reconstruction of the chronostratigraphic setting enabled us to assess local uplift and fault displacement due to volcano-tectonic processes associated with the activities of Bolsena-Orvieto and Latera volcanoes since 350 ka, and develop an uplift curve for the different sectors of the investigated area. Moreover, we estimate sedimentation rate during post-glacial sea-level rise. Strong differential uplift, with rates on the order of 0.6–1.2 mm/yr corresponded with the onset of major eruptive phases, whereas a homogeneous regional uplift of 0.24 mm/yr during the last 125 ky followed this climactic phase. These uplift rates are significantly smaller than sedimentation rate during the glacial termination, consistent with the observed independence of the glacio-eustatic signal.

Original languageEnglish
Article number103009
JournalGlobal and Planetary Change
Volume182
DOIs
Publication statusPublished - Nov 2019
Externally publishedYes

Keywords

  • Central Italy
  • Glacio-eustasy
  • Quaternary volcanism
  • Regional uplift
  • Tyrrhenian Sea margin

ASJC Scopus subject areas

  • Global and Planetary Change
  • Oceanography

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