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• W1976099323 abstract "The SW part of Sardinia has been afflicted, in recent years, by several cover-collapse sinkholes mostly occurring in low-density population areas. The study area, that lies in the Iglesiente–Sulcis region, is characterized by the cropping out of the Palaeozoic basement related to the South European Hercynian chain, covered with Tertiary–Quaternary sediments. The main rock types that crop out are Palaeozoic metasandstones, metadolostones, metalimestones, shales and metaconglomerates, and Tertiary–Quaternary fluvial–lacustrine continental sediments. The combined application of several geophysical techniques, integrated with boreholes and geotechnical as well as hydrogeological measurements, proved to be very useful and promising in defining in detail the geological context in which each sinkhole has formed. Moreover, the gravity method, even when used alone, proved to be very effective in detecting the regional geological structures to which sinkholes are related. Eventually, the historical analysis of phenomena, the geological knowledge of the Iglesiente– Sulcis area and the results of properly designed geophysical surveys allows the most probable areas for cover-collapse sinkholes to occur in the future to be determined. In fact, this research pointed out that the depth of the sediment-covered Palaeozoic bedrock is one of the major constraints in delimiting hazardous areas, leading to the construction of a preliminary hazard map. This map shows a belt of high risk, and also suggests the areas in which further geophysical and geotechnical investigations should be carried out to estimate the depth of the bedrock. Cover-collapse sinkholes forming on karst terrains covered with more or less loose sediments have been described from many areas of the world (Beck 1986; Newton 1987; Twidale 1987; Soriano & Simon 1995; Kaufmann & Quinif 1999; Salvati & Sasowsky 2002; Waltham et al. 2005). These phenomena are often triggered by human intervention, especially by water extraction and modifications in surface drainage patterns, and are further enhanced by the increasing occurrence of extreme meteorological events. Similar hazards have been occurring in several areas of SW Sardinia (Italy) since the early 1990s with increasing frequency (Balia et al. 2001; De Waele & Muntoni 2001). One of the most interesting and impressive sinkholes formed in October 1998 in the Cixerri Valley, at Guardia Su Merti, only 50 m away from the main railway that connects Cagliari to Iglesias (Balia et al. 2001). Other major sinkholes occurred 1 year later some kilometres south, in an area named Planu Francau close to the main road from Villamassargia to Carbonia (Fadda & Fais 2002; De Waele et al. 2003). The increase in the formation of these sinkholes has led local and regional stakeholders and decision makers to consider studying these phenomena that could seriously endanger local infrastructures and human lives in the near future. Geological setting Cover-collapse sinkholes have been reported from several covered karst areas in SW Sardinia, near the villages of Carbonia, Iglesias, Narcao, Sant’Anna Arresi and Villamassargia (Balia et al. 2001; De Waele & Muntoni 2001; Fadda & Fais 2002; De Waele et al. 2003). The study area (Fig. 1) is characterized by the outcrops of Palaeozoic metasediments ranging in age from Early Cambrian to Upper Carboniferous, covered with Tertiary–Quaternary sediments and volcanic rocks. From bottom to top the Palaeozoic sequence is composed of metasandstones, shales, oolithic limestones, calcareous sandstones, dolostones, intensely karstified limestones and shales (Pillola 1989; Bechstadt & Boni 1996; Carmignani et al. 2001). PostPalaeozoic sedimentation starts only during the Lower Tertiary with marly limestones, marls and mudstones with coal seams of Eocene age (Murru & Matteucci 2002). Sedimentation continues with alluvial and lacustrine deposits composed of conglomerates and sandstones of the Cixerri Formation of Middle Eocene–Upper Oligocene age (Carmignani et al. 2004). Immediately south of Villamassargia these sediments are overlain with andesites and basaltic andesites of Oligocene–Lower Miocene age (Beccaluva et al. 1985). From: PARISE, M. & GUNN, J. (eds) Natural and Anthropogenic Hazards in Karst Areas: Recognition, Analysis and Mitigation. Geological Society, London, Special Publications, 279, 47–57. DOI: 10.1144/SP279.5 0305-8719/07/$15.00 # The Geological Society of London 2007. Fig. 1. Geological map of the study area and surrounding region. F. ARDAU ET AL. 48" @default.
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• W1976099323 date "2007-01-01" @default.
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• W1976099323 title "Assessment of cover-collapse sinkholes in SW Sardinia (Italy)" @default.
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