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A newly discovered Pliocene volcanic field on the western Sardinia continental margin (western Mediterranean)

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Abstract

A previously unknown submerged volcanic field offshore western Sardinia (western Mediterranean Sea), has been identified based on swath bathymetric data collected in 2009, 2010 and 2013, and high-resolution seismic profiles collected in 2011 and 2013. About 40 conical-shaped volcanic edifices (maximum width of about 1600 m and maximum height of about 180 m) and several lava outcrops (up to 1,200 m wide) were recognized at 20 to 150 m water depth over an area of 800 km2. The volcanic edifices are mainly eruptive monogenic vents, mostly isolated with a rather distinct shape, or grouped to form a coalescent volcanic body in which single elements are often still recognizable. High-resolution seismics enabled identifying relationships between the volcanic bodies and continental margin successions. The edifices overlie a major erosional surface related to the margin exposure following the Messinian salinity crisis, and are overlain by or interbedded with an early Pliocene marine unit. This seismo-stratigraphic pattern dates the volcanic activity to the early Pliocene, in agreement with the radiometric age of the Catalano island lavas (4.7 Ma) reported in earlier studies. The morphometry of the volcanic bodies suggests that cone erosion was higher at shallow water depths. Indeed, most of the shallow edifices are strongly eroded and flattened at 125 to 130 m water depth, plausibly explained by recurrent sub-aerial exposure during Pleistocene sea-level lowstands, whereas cones in deeper water are much better preserved. Volcanic vents and lava deposits, hereafter named the Catalano volcanic field (CVF), are emplaced along lineaments corresponding to the main directions of the normal fault system, which lowered the Sinis Basin and the western Sardinia continental margin. The CVF represents a volumetrically relevant phase of the late Miocene – Quaternary anorogenic volcanic cycle of Sardinia, which is related to the first stage of the extensional tectonics affecting the island since the late Miocene.

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Acknowledgements

The data of the present study were collected within the framework of the Magic project (Marine Geohazards along Italian Coasts) and the Ritmare project CNR (Sub-project SP4, Work-Package 1, Actions 1, 2). We would like to thank the captains and crews of the research vessels Urania, Maria-Grazia and Minerva 1 for their support during the 2007–2013 cruises. We are grateful to G.Y. Brocard, an anonymous reviewer and the journal editors for their pertinent and helpful comments on the earlier manuscript.

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  1. Istituto per l’Ambiente Marino Costiero - CNR, UOS Oristano, loc. Sa Mardini, 09170, Torregrande, Oristano, Italy

    Alessandro Conforti & Giovanni De Falco

  2. Istituto per l’Ambiente Marino Costiero - CNR, Calata Porta di Massa, Porto di Napoli, 80133, Napoli, Italy

    Francesca Budillon & Renato Tonielli

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  1. Alessandro Conforti
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Conforti, A., Budillon, F., Tonielli, R. et al. A newly discovered Pliocene volcanic field on the western Sardinia continental margin (western Mediterranean). Geo-Mar Lett 36, 1–14 (2016). https://doi.org/10.1007/s00367-015-0428-0

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