Delle Rose M., Santi P., Renzulli A.,, 2007, Volcanogenic sediments of the Apulian Foreland_ implications on paleo-environment and provenance., Epitome (Udine) 2 (2007): 147.,
URL: http://www.cnr.it/prodotto/i/118242

In the Apulia region, which represents the Plio-Quaternary foreland of the Southern Apennines orogenic system, some volcaniclastic deposits are reported in the literature (Radina, 1958; Capaldi et al., 1979; Delle Rose, 2006). They crop out within the dolines of the Murge carbonatic plateau and are described as volcanic ash fall levels whose chemical and mineralogical features could be compatible with pyroclastics of the Vulture activity (Radina, 1958). Along the coastline of the Apulia, Holocene rhyolitic pumice levels are interbedded in the sand dunes (Cotecchia et al., 1969; Ricchetti and De Fino, 1969), whereas recent or actual volcaniclastic deposits are recorded within some karst caves (Lazzari, 1955; Palma di Cesnola, 1966). In the sedimentary deposits of the Bradanic Trough, several volcaniclastic layers are reported as interbedded within the "Subapennines Clay Formation" (lower - middle Pleistocene) and show a trachytic composition (Ciaranfi et al., 1996). Nevertheless, in the eastern side of the Bradanic Trough, in the neighbourhood of Taranto, a late lower Pleistocene (Sicilian) rhyolitic ash deposit is described (Capaldi et al., 1979; Mazzei, 1985). This work gives a preliminary description of two new deposits containing volcaniclastic material, discovered on the southeastern Apulia, at S. Maria di Agnano (Ostuni, Brindisi) and Signorella (Cutrofiano, Lecce). As concerning the volcanogenic sediments of these two localities we are dealing with their depositional features and possible source areas. At S. Maria di Agnano slightly lithified mixed volcaniclastic-biogenic-terrigenous sediments fill decimetric-size karstified vertical fractures of the Cretaceous carbonatic substratum. Benthos content indicates very shallow sea or shoreline environment of deposition (Delle Rose and Medagli, this volume). The volcanic components are mainly represented by aphyric (P.I.<=3%) rhyolitic pumices with few microphenocrysts of feldspar and biotite. The elevation of these filled karst fractures, that is about 190 m above sea level, rule out a correlation of these volcanogenic deposits with the Holocene pumice levels detected southward in the coastal area between Taranto and Leuca (Ricchetti and De Fino, 1969). The lithified volcaniclastic deposit of Signorella, overlaying the local neritic "Subapennines Clay-like unit", is about 10 cm thick and truncated on top by an erosional surface. The fine grained and graded components are represented by pumiceous lapilli and glass shards frequently with Y-shape. On the basis of the literature, this level can be referred to the late lower Pleistocene, the age being fixed by the top of "Subapennines Clay-like unit" (Salvatorini, 1969; Bossio et al., 1987). We will explore possible relationships and common provenance among S. Maria di Agnano and Signorella deposits and the already known rhyolitic ash of Taranto. References Bossio A., Guelfi F., Mazzei R., Monteforti B., Salvatorini G. and Varola A. (1987). Quad. Stud. Geot. Ing., 11, 147-167. Capaldi G., Civetta L., Lirer L. and Munno R. (1979). Geol. Appl. Idrog., 4, 493-501. Ciaranfi N., Marino M., Sabato L., D'Alessandro A. and De Rosa R. (1996). Boll. Soc. Geol. It., 115, 379-391. Cotecchia V., Dai Pra G. and Magri G. (1969). Geol. Appl. Idrog., 4, 93-147. Delle Rose M. (2006). Atti 83a Riun. Soc.Geol. It., 109-111. Lazzari A. (1955). Boll. Soc. Natural. in Napoli, 64, 83-92.

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