Titre | A reworked isolated deposit of the Kos Plateau Tuff and its significance for dating raised marine terraces, Kos, Greece |
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Auteur | Piper, D J W ;
Pe-Piper, G |
Source | Geological Magazine 2020 p. 1-12, https://doi.org/10.1017/S0016756820000254 |
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Année | 2020 |
Séries alt. | Ressources naturelles Canada, Contribution externe 20190323 |
Éditeur | Cambridge University Press |
Document | publication en série |
Lang. | anglais |
DOI | https://doi.org/10.1017/S0016756820000254 |
Media | papier; en ligne; numérique |
Formats | pdf |
Région | Kos |
Lat/Long OENS | 27.2667 27.3500 36.8833 36.8333 |
Sujets | Pléistocène; tufs volcaniques; pierre ponce; terrasses; pétrographie; analyses géochimiques; antécédents géologiques; antécédents tectoniques; stades interglaciaires; changements du niveau de la mer;
plages soulevées; déplacement des sédiments; soulèvement de la croûte; Arc de South Aegean ; Nature et environnement; Sciences et technologie; géochimie; géologie marine; Phanérozoïque; Cénozoïque; Quaternaire |
Illustrations | cartes de localisation; cartes géolscientiques généralisées; coupes lithologiques; tableaux; photographies; dessins; graphiques; photomicrographies; séries chronologiques |
Programme | Division de la CGC atlantique |
Diffusé | 2020 04 21 |
Résumé | (disponible en anglais seulement) The 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. |
Sommaire | (Résumé en langage clair et simple, non publié) L'éruption du tuf du plateau de Kos (Grèce), 161 ka, est la plus grande éruption volcanique explosive de la région de la Méditerranée orientale.
La découverte de nouveaux affleurements nous permet de mieux définir le caractère volcanologique de l'éruption et offre des repères de temps pour la datation des terrasses marines surélevées, ce qui suppose des taux de soulèvement pouvant atteindre 1
mm/an. |
GEOSCAN ID | 321088 |
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