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TitleA reworked isolated deposit of the Kos Plateau Tuff and its significance for dating raised marine terraces, Kos, Greece
AuthorPiper, D J W; Pe-Piper, G
SourceGeological Magazine 2020 p. 1-12, https://doi.org/10.1017/S0016756820000254
Year2020
Alt SeriesNatural Resources Canada, Contribution Series 20190323
PublisherCambridge University Press
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
AreaKos; Greece
Lat/Long WENS 27.2667 27.3500 36.8833 36.8333
SubjectsNature and Environment; Science and Technology; geochemistry; marine geology; Pleistocene; tuffs; pumice; terraces; petrography; geochemical analyses; geological history; tectonic history; interglacial stages; sea level changes; raised beaches; sediment reworking; crustal uplift; Kos Plateau Tuff; South Aegean Arc; neotectonics; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; geoscientific sketch maps; lithologic sections; tables; photographs; cartoons; plots; photomicrographs; time series
ProgramGSC Atlantic Division, Director Office
Released2020 04 21
AbstractThe 161-ka Kos Plateau Tuff (KPT) eruption deposited widespread unwelded ignimbrites, but the Dikeos and Sympetro mountains on the SE of Kos Island blocked all but the most energetic pyroclastic flows. KPT remnants north of Sympetro mountain comprise reworked tuffite containing pumice and lithic clasts that petrologically and geochemically resemble those found in KPT unit E tephra, and reworked accretionary lapilli similar to those in KPT unit F. Tuffite is found only downslope from a 375-m-high pass between the Dikeos and Sympetro mountains, which was breached at the eruption climax by pyroclastic flows that then accelerated down the 10° north slope of Sympetro. The tuffite crops out in the palaeocliffs of a prominent terrace at an elevation of 75 m, interpreted as the transgressive ravinement surface of the first interglacial marine highstand after the KPT eruption during marine isotope stage (MIS) 5e. A similar ravinement surface cuts KPT deposits in central Kos at elevations of up to 135 m and implies post-MIS 5e uplift rates of 0.7-1.0 m ka-1, confirmed by the elevation of a previously reported raised beach beneath the KPT. A Holocene raised beach on the east coast of Kos contains pumice clasts from the Yali-4 eruption at 4-3 ka. Its elevation of 2mabove sea level is consistent with the elevation of the local MIS 5e terrace. Its present erosion results from the blocking of discharge from ephemeral streams by human infrastructure.Our study provides the first integrated chronologic and neotectonic interpretation of the prominent plateau and terrace surfaces on Kos Island.
Summary(Plain Language Summary, not published)
The Kos Plateau Tuff (Greece) eruption at 161 ka was the largest explosive volcanic eruption in the eastern Mediterranean. Discovery of new outcrops constrains the volcanological character of the eruption and provides a time marker for dating raised marine terraces which imply uplift rates as great as 1 mm/year.
GEOSCAN ID321088