Studying travertines for neotectonics investigations: Middle–Late Pleistocene syn-tectonic travertine deposition at Serre di Rapolano (Northern Apennines, Italy) |
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Authors: | Andrea Brogi Enrico Capezzuoli Riccardo Aqué Marilì Branca Mario Voltaggio |
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Institution: | 1. Dipartimento di Scienze della Terra, Università di Siena, Via Laterina, 8, 53100, Siena, Italy 2. CNR-IGAG c/o Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, Piazzale Aldo Moro, 5, 00185, Rome, Italy
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Abstract: | Middle–Late Pleistocene tectonic activity has been inferred through studies on travertine deposits exposed in a tract of the
hinterland Northern Apennines. A detailed study on the relationships between tectonics and travertine deposition coupled with
230Th/234U age determination of travertines at Cava Oliviera quarry, located close to Serre di Rapolano village (southern Tuscany,
Northern Apennines), allowed us to recognise Pleistocene faults, whose activity has been referred to 157–24 ka, at least.
Travertine deposition was tectonically controlled by WSW-ENE striking, oblique and normal faults, associated to a main fault
(named as the Violante Fault). This structure dissected a regional normal fault (known as the Rapolano Fault) Early–Middle
Pliocene in age, which bounded the eastern side of the Pliocene Siena Basin, and gave rise to space accommodation for clayey
and sandy marine sediments. Hydrothermal circulation (and related travertine deposition) was favoured by the damaging enhancement
due to the fault–fault intersection. Tectonic activity has been also documented by deformation recorded by travertines, which
suggest a main tectonic event between 64 ± 5 and 40 ± 5 ka. The tectonic activity described for the study area agrees with
the Quaternary tectonic evolution documented in the surrounding areas (e.g. Mt. Amiata and Mt. Vulsini), as well as the Tyrrhenian
margin of the Central Apennines, indicating that a widespread tectonic activity affected the inner part of the Apennines until
the latest Quaternary. |
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