Late Holocene vertical deformation along the coast of Pantelleria Island (Sicily Channel, Italy)

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• 作者：Giorgio de Guidi ; Carmelo Monaco
• 刊名：Quaternary International
• 出版年：2009
• 出版时间：1 September 2009
• 年：2009
• 卷：206
• 期：1-2
• 页码：158-165
• 全文大小：663 K

文摘

According to historical reports, the north-eastern coastal sector of the volcanic Pantelleria Island (Sicily Channel, Italy) was uplifted up to 1.0 m a.s.l. in the year preceding the October 1891 offshore eruptive event. To better understand the nature and timing of coastal uplift, a detailed survey of morphological and biological indicators of raised palaeo-shorelines has been carried out along the island coastline. This survey identified raised palaeo-shoreline levels at three elevation ranges: 2.5–4.2 m a.s.l. (highest), 1.5–2.7 m a.s.l. (intermediate) and 0.4–1.0 m a.s.l. (lowest). Radiocarbon dating on samples of corals and vermetids placed tight temporal constraints on the uplifting of the raised shorelines. In general, they indicate that the north-eastern sector of the island, centred on the area of Cala del Gadir, has undergone major uplifting, tilting the island towards the southwest from 900 years ago. Applying accurate corrections for sea-level variations, the total amount of volcano-tectonic uplift can be estimated. Uplift rates up to 5 mm/a suggest that the vertical deformation was caused by inflation processes related to magmatic intrusion along feeding fissures.