Poseidon Berichte - Paphsanias Volcano Cruise POS512, 25.04.2017 – 06.05.2017, Heraklion (Griechenland) – Heraklion (Griechenland) .

Haase, Karsten, Beier, Christoph, Bodendorfer, Matthias, Cuno, Patrick, Huusmann, Hannes, Lampridou, Danai, Karagiannakis, Eustratios, Matthiessen, Torge, Pieper, Martin, Storch, Betttina and Wölki, Dominic (2017) Poseidon Berichte - Paphsanias Volcano Cruise POS512, 25.04.2017 – 06.05.2017, Heraklion (Griechenland) – Heraklion (Griechenland) . Open Access . UNSPECIFIED, 124 pp. DOI 10.3289/CR_POS512.

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Cruise POS512 was scheduled for ten working days from 25.4. to 6.5.2017 in order to (1) produce a bathymetric map of the Epidavros Basin near the peninsula of Methana, (2) survey the volcanic structures of the Paphsanias Volcanic Field with the ROV PHOCA, and (3) sample the volcanic rocks. The Paphsanias Volcanic Field was found in 1987 but only one rock sample had been recovered and the size, age and composition of the lavas were unknown. Historic reports suggested an eruption on Methana and potentially off the coast some 2000 years ago. The bathymetric survey showed that six volcanic structures form the volcanic field ranging from simple lava flows on the seafloor, small cone-like structures to relatively complex crater-like structures with small volcanic domes. The largest volcanoes are about 200 m high and have diameters of about 2 km. The northern two complex Volcanoes 1 and 2 are relatively young and consist of steep lava flows and dome-like structures with little sediment. No indication of very young volcanism and hydrothermal activity was found. In contrast, the four southern structures are mostly sediment-covered and outcrops of volcanic rocks are rare and often covered by thick carbonate and MnOOH crusts. These four edifices are older than the northern two. Lava samples range from olivine-bearing basalts to plagioclase-amphibole-biotite-phyric andesites and dacites. All lavas appear to be fresh but few show signs of submarine extrusion and quenching. Volcaniclastic material was rarely observed and sampled indicating that explosive volcanic activity did not occur. During cruise POS512 13 ROV dives recovered 163 samples including 131 fresh lavas from four different volcanoes of the Paphsanias Volcanic Field and 427 nm of bathymetric survey was carried out.

Document Type: Report (Cruise Report)
Keywords: RV Poseidon, POS512, Cruise report, Epidavros Basin, peninsula of Methana, bathymetry, Paphsanias Volcanic Field, volcanic structures
Research affiliation: OceanRep > GEOMAR > ZE Central Facilities > ZE-TLZ Technical and Logistics
DOI etc.: 10.3289/CR_POS512
Date Deposited: 25 Jul 2018 09:48
Last Modified: 31 Jul 2018 08:12
URI: http://oceanrep.geomar.de/id/eprint/43814

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