Istituto di Geoscienze e Georisorse     
Volentik A., Vanderkluysen L., Principe C. Stratigraphy of the Caldera walls of Nisyros volcano, Greece. In: Eclogae Geologicae Helvetiae, vol. 95 pp. 223 - 235. Springer, 2002.
The active Nysisros volcano, at the eastern end of the Aegean volcanic arc, is topped by a recent caldera, on average 4 km in diameter and 200 m in depth. It is thought to result from the so called Lower Pumice (LP) and Upper Pumice (UP) eruptions, with a poorly constrained age (from 110 ky to 24 ky). In a detailed study of the exposed walls of the caldera, we defined 25 different stratigrafic units (lava flows, tephra and lacustrine deposits). The lava flow unit 3, an early event in the stratigrafic succession, dips inward, in the direction of the present caldera; two lacustrine units (with an estension of ~500 m) have also been found in the north-eastern part of the caldera cliff, suggesting the presence of a previuos, small caldera. Furthermore, three major tectonic trends (oriented at N40, N70 and N170) have influenced the emplacement of the dykes, the faulting and the fracturing of the island, as well as topography of the eastern flank of the caldera, where redoubling of the stratigrafphy occurs. On the basis, we hypothesize that a fist, relatively small caldera was present in the earliest period of actvity of Nysyros, and that today's caldera is the result of multiple caldera-forming events, in great part controlled by major tectonic trends
URL: http://https://link.springer.com/journal/15
Subject Greece
Aegean arc
Nisyros volcano
volcanic activity

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