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Semproniano, Grosseto Province, Tuscany, Italy

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Location is approximate, based on center of defined region.
Latitude & Longitude (WGS84): 42° North , 11° East (est.)
Neighbouring regions:
Name(s) in local language(s):Semproniano, Provincia di Grosseto, Toscana, Italia

Travertine deposits located to the south and south-west of Semproniano.

The main deposit is situated to the south of Semproniano at an elevation between 490 and 700 m asl. The morphological position and the sedimentological features of this travertine plate, indicate its formation before the incision of the Albegna valley. This travertine deposit lies on marine Pliocene deposits with a contact surface that is about 3–4° inclined toward the south and is cut by a NE–SW fault: it was thus affected by tectonics, tilting and uplift. No dating is available for this travertine deposit, but faulting and tilting could probably be related to the local uplift due to the bulging of the Mt. Amiata magmatic chamber that appears to have happened in Middle Pleistocene (Barberi et al., 1994; Bosi et al., 1996).

A small thermal travertine deposit is located just along the right side of Albegna canyon, south-west of Semproniano, where it cuts across the carbonate structure of Montecchio (in which opens Montecchio cave [see: http://www.mindat.org/loc-266149.html]). The deposit has the shape of a long (about 700 m) and narrow terrace along the right (western) slope of the valley. The top surface of this travertine deposit is located at an elevation of 240–250 m asl, around 20 m above the present river bed. Dating indicates an age younger than 106± 12 ka and probably ~46± 10 ka (Piccini et al., 2015).

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17 valid minerals.

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Localities in this Region

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- Barberi F., Buonasorte G., Cioni R., Fiordelisi A., Foresi L., Iaccarino S., Laurenzi M.A., Sbrana A., Vernia L., Villa L.M. (1994): Plio-Pleistocene geological evolution of the geothermal area of Tuscany and Latium. Mem. descr. Carta Geol. d'Italia, 44, 77–134.
- Bosi C., Messina P., Rosati M., Sposato A. (1996): Età dei travertini della Toscana meridionale e relative implicazioni neotettoniche. Mem. Soc. Geol. Ital., 51, 293–304.
- Piccini L., De Waele J., Galli E., Polyak V.J., Bernasconi S.M., Asmeron Y. (2015): Sulphuric acid speleogenesis and landscape evolution: Montecchio cave, Albegna river valley (Southern Tuscany, Italy). Geomorphology, 229, 134–143.

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