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Genesis of Tephra-derived Soils from the Roccamonfina Volcano, South Central Italy

^a Dipartimento di Scienze della Terra, Università degli Studi di Cagliari, Via Trentino 51, 09127 Cagliari, Italy
^b Dipartimento di Scienze del Suolo, della Pianta e dell'Ambiente, Università degli Studi di Napoli "Federico II", Via Università 100, 80055 Portici (Na), Italy

View larger version (41K): [in a new window]   Fig. 1. Map of the study area in Italy and within the Campanian petrographic province. Numbers 1 through 7 indicate the locations of the pedons examined in this study.

View larger version (151K): [in a new window]   Fig. 2. Transmission electron micrographs of the clay fraction of selected soil horizons: (a) smooth and curved fibres of imogolite in the 3Bw1 horizon of Pedon 2; (b) aggregates of spherical, ring-shaped particles of allophane in the 2C horizon of Pedon 4; (c) spheroids and tubes of halloysite in the 4Bw2 horizon of Pedon 1; and (d) tubes of halloysite in the Bw horizon of Pedon 4.