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|Autori interni:||BENVENUTI, MARCO|
|Data di pubblicazione:||1994|
|Abstract:||Field trip program: Bus departure from Pisa. Arrival in Carrara. Visit of two quarries in the Fantiscritti - Canal Grande area, few kilometers east of Carr~ at about 400 m a.s.l. The first quarry (Galleria Ravaccione) is developed underground starting from a tunnel of the former railroad that connected the main marble basins. The second quarry (Forti) is ex-ploited by usual open pit methods. The main marble variety in both quarries is "Bianco Ordinario"; the "Statuario" rarely occurs. The quarrying debris may be used for "ventilated" lime, household abrasives, or simply as a filler. Bus departure from Bocca di Magra to the nearby archaeological site of Luni, whose history is tightly connected with marble quarries and mining activity. Bus departure from Luni. Arrival in Valdicastello, at the southwestern tip of the S. Anna tectonic window. A short hike (15 min.) leads to the Pizzone stope of the Pollone mine (PZ in Fig.8). Of all ore deposits in the area, this is practically the only exposure easily accessible today. All underground workings have been abandoned for years, and what used to be good outcrop exposures are now covered by thick vegetation. The remains of the underground workings clearly show the setting of the stratiform ore (''banchi"), gently dipping to the west. At the outcrop, one still can see (subeconomic) mineralization, consisting of pyrite and/or barite layers parallel to the host rock foliation. Notice the abundance of tourmaline in the country schists. Subvertical quartz veins, sharply cutting through the host rock foliation, may also be observed They have roughly the same setting of the vein ore ("filoni"). One of such "filoni" crops out over a limited area across the nearby creek (Canale dei Molini) and was exploited in the past mainly for its high silver contents (Preziosa-Rosina stope). Moving up along the former mine road, past the main adit of Pizzone, in about 5 min. the Cugnasca stope can be reached. The few outcrops still exposed show thick, flat lying barite (±pyrite) veins, that cut at low angle the host rock foliation (i.e., they are "filoni" even if at first glance may appear as "banchi"). Bus departure from Valdicastello and arrival in Pisa: trip ends.|
|Autori:||M. BENVENUTI; P. COSTAGLIOLA; P. LATTANZI; G. TANELLI|
|Titolo:||ORE DEPOSITS AND MARBLE QUARRIES OF THE APUANE ALPS|
|Appare nelle tipologie:||4a - Articolo in atti di congresso|
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