Abstract
A multidisciplinary geological and compositional investigation allowed us to reconstruct the occurrence of flank eruptions on the lower NE flank of Stromboli volcano since 15 ka. The oldest flank eruption recognised is Roisa, which occurred at ~15 ka during the Vancori period, and has transitional compositional characteristics between the Vancori and Neostromboli phases. Roisa was followed by the San Vincenzo eruption that took place at ~12 ka during the early stage of Neostromboli period. The eruptive fissure of San Vincenzo gave rise to a large scoria cone located below the village of Stromboli, and generated a lava flow, most of which lies below sea level. Most of the flank eruptions outside the barren Sciara del Fuoco occurred in a short time, between ~9 and 7 ka during the Neostromboli period, when six eruptive events produced scoria cones, spatter ramparts and lava flows. The Neostromboli products belong to a potassic series (KS), and cluster in two differently evolved groups. After an eruptive pause of ~5,000 years, the most recent flank eruption involving the NE sector of the island occurred during the Recent Stromboli period with the formation of the large, highly K calc-alkaline lava flow field, named San Bartolo. The trend of eruptive fissures since 15 ka ranges from N30°E to N55°E, and corresponds to the magma intrusions radiating from the main feeding system of the volcano.
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Acknowledgements
The map** of Stromboli was supported by a grant to S. Calvari (Project V2/01, 2005–2007, funded by the Istituto Nazionale di Geofisica e Vulcanologia and by the Italian Civil Protection). This work was partly supported by INGV through a research grant financed by MIUR-FIRB to G. Norini. We wish to thank the former Director of INGV-Sezione di Catania, A. Bonaccorso, for making additional funds available for field trip and datings; M. Marsella for the wonderful 2001 orthophotos that added so much information to our work; J. Keller for the many and precious discussions and suggestions on the geology of Stromboli; and the BV Associate Editor B. van Wyk de Vries and Executive Editor J.D.L. White for their useful suggestions that helped improve the clarity of the paper. We are also indebted to M. Di Vito, G. Groppelli, L. Lodato, M. Neri and G. Orsi for fruitful discussions during the geological survey, to G. Lanzafame for his many suggestions and discussions about the structural interpretation, and to L. Messina for preparing powder for rocks analyses. Stephen Conway improved the English style.
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Calvari, S., Branca, S., Corsaro, R.A. et al. Reconstruction of the eruptive activity on the NE sector of Stromboli volcano: timing of flank eruptions since 15 ka. Bull Volcanol 73, 101–112 (2011). https://doi.org/10.1007/s00445-010-0412-5
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DOI: https://doi.org/10.1007/s00445-010-0412-5