Some geological and environmental aspects of the Sàrrabus-Gerrei Region (SE Sardinia, Italy)

Abstract

This paper focus on some geological and environmental aspects of the Sàrrabus-Gerrei region (SE Sardinia, Italy). The first part (leader: Francesco Secchi) is dedicated to the Sàrrabus igneous massif that outcrops over an area of about 400 km2 and is a shallow calcalkaline pluton characterized by multiple intrusions emplaced in the frontal part of a nappe pile at the end of hercynian orogeny. The second part of the trip (leader: Mario Lorrai) is dedicated to the abandoned antimony mine of Su Suergiu (Villasalto, Gerrei) where an important metallurgical activity has been joined with mining works since 1882. In this area, the hydrogeochemical characterization of both ground and surface waters provide useful information about the impact of the past mining activity on the environment