Neotectonics and the Kos Plateau Tuff eruption of 161 ka, South Aegean arc

Pe‐Piper, Georgia; Piper, David J. W.; Perissoratis, C.

doi:10.1016/j.jvolgeores.2004.08.014

Cited by 50 publications

(26 citation statements)

References 29 publications

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“…Its geological history is associated with the strongest eruption in the Pliocene-Quaternary HVA, incorporating the large (>60 km 3 ) Kos Plateau Tuff calderaforming event 161 ka ago in the SW part of the island ( Fig. 1; Pe-Piper et al 2005;Bachmann et al 2007). The pre-Alpine and Alpine basement of Kos is characterised by geotectonic units belonging to both the Internal and External Hellenides (Papanikolaou 2013), which were deformed during the Tertiary and comprise phyllites, pelites and marbles with mafic intercalations, as well as Cretaceous to Eocene carbonate sequences (limestones) and flysch deposits.…”

Section: Geological Settingmentioning

confidence: 99%

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Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea

Megalovasilis

Γοδελίτσας

2015

Geo-Mar Lett

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The Kos-Nisyros volcanic centre is a long-active, Plio-Pleistocene magmatic system in the subduction zone along the easternmost edge of the active Hellenic volcanic arc in the Aegean Sea. Although today there are signs of relative quiescence in volcanic activity, active onshore fumaroles and shallow-sea hydrothermal vents persist on, amongst others, the island of Kos. The present study explores the largescale imprint of hydrothermally sourced heavy metals and nutrients on the island's coastal marine environment, based on geochemical data collected in September 2007 from hydrothermal waters and surficial nearshore sediments (<10 m water depth) at several vents in the Bros Thermi and Kephalos Bay hydrothermal fields. There were strong spatiotemporal fluctuations in gas and water flow rates at the vent sites-for example, the gas/water flux ratio varied by as much as two orders of magnitude (0.03-1.30) at Kephalos Bay vents over a 2-day measurement period on 15-16 September 2007. Confirming earlier work, hydrothermal waters had higher levels of F, Ca and Sr, and lower levels of Na, Mg and SO 4 compared with ambient seawater. Moreover, there was novel evidence of strong, widespread Zn and also Mn enhancement. Cluster and factor analyses of surficial sediment data from the Bros Thermi vents (fine (mud) fractions, <63 μm, 6N HCl dissolution) revealed distinct groups of elements such as Cu+ Pb+Zn and Mn+Mg. Spatial distribution maps showed similarities in the dispersion of Cu and Pb, and of Ca and Ba. The distribution of HCl-soluble material is the inverse mirror image of the distribution of the residual (silicate and Al-silicate) phase. These findings considerably expand on existing knowledge that the coastal zone of Kos is severely influenced by ongoing submarine hydrothermal activity, and confirm that shallow-water sediment Fe, Mn, Zn and Pb levels are substantially higher than those of other islands along the Hellenic volcanic arc, and even exceed those of some deepwater hydrothermal vents in other world regions. Evidently, there may be significant metallic sulphide deposits of hydrothermal origin at depth beneath Kos.

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Section: Geological Settingmentioning

confidence: 99%

“…The Hellenic volcanic arc and Kos island geology (modified afterPe-Piper et al 2005), including the two nearshore study areas (rectangles) All water samples had the characteristic smell of H 2 S. Any temporal variations in gas and water fluxes were assessed by means of extended sampling in vents K1, K2 and K3(Fig. 2).…”

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confidence: 99%

Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea

Megalovasilis

Γοδελίτσας

2015

Geo-Mar Lett

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“…Mainly the western part covered with a layer of ash and pumice of about 30 meters in thickness. This formation is unconformably overlying or concordant with older stratified sediment in west Kos basin of thickness more than 100 m. Kos Plateau Tuff (KPT) eruption was the largest eruption in the Pliocene-Quaternary in Hellenic volcanic arc (Pe-Piper et al, 2005). Kos is controlled by WNW-ESE and NE-SW faults systems, which are related to extensional processes and volcanic activity during the Pleistocene and Pliocene (Papanikolaou and Lekkas, 1990;Lagios et al, 1998).…”

Section: Geological Settingmentioning

confidence: 97%

Assessment on Hydrothermal Particle Chemistry From a Shallow Venting System Offshore Kos, Aegean Sea

Megalovasilis¹

2017

geosociety

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“…The southern zone comprises the basins of Southern Nisyros and Tilos with great depths (570m and more than 1000m). The general trend is NE-SW at the western part and E-W at the eastern part (Nomikou, 2004;Pe-Piper et al, 2005). The northern margin of this southern zone -tectonic graben is made of the volcanic formations of the Nisyros volcanic field, whereas the southern margin is made of the Tilos tectonic horst, with the Alpine basement rocks at maximum altitude of 654m.…”

Section: Synthesis-comparison Of Submarine Basinsmentioning

confidence: 99%

“…Systematic research combining onshore and offshore data has been carried out in the area around Kos, Nisyros and Tilos islands in the Dodecanese since the late nineties aiming at a comprehensive view of the geodynamic processes in the area (Papanikolaou et al, 1991;Papanikolaou et al, 1998;Nomikou and Papanikolaou, 2000;Papanikolaou and Nomikou, 2001;Nomikou, 2004;Pe-Piper et al, 2005;Tibaldi et al, 2008). More precisely, the occurrence of the easternmost volcanic activity of the modern volcanic arc in the area gives the possibility of analysing the geomorphology as a result of the ongoing tectonic and volcanic activity.…”

Section: Introductionmentioning

confidence: 99%