Helene Sunmark

A first step towards a Holocene Tephrochronology for the Peloponnesus peninsula, SW Greece

Datum, tid och plats: Onsdag den 14/6, kl. 10.00 i sal U10
Handledare: Stefan Wastegård
Examinator: Jan Risberg
Presentationen är på engelska

Abstract
Dating and correlation of climate archives are essential for understanding climate development and paleoenvironments. Tephrochronology is a well established dating method which involves the use of widely dispersed volcanic glass for correlation and dating of climate archives. A tephrostratigraphical study has been carried out in cores from two sites in the SW Peloponnesus peninsula, SW mainland Greece, with the aim of creating a Holocene tephrochronology for the area. Attempts to geochemically analyse possible shards of tephra from depths in both cores were performed at the Grant Institute, School of GeoSciences at the University of Edinburgh and Geocentrum in Uppsala. The geochemical data from these analyses indicated presence of tephra in two depths from one of the cores. The results from Edinburgh and Uppsala infer that the two tephras were deposited around 2500 cal yrs. BP and 3200 cal yrs. BP, respectively. However, confident identification of these tephras was not possible due to the insufficient number of analyses. The results from the other site indicate high concentrations of phytoliths in the peat, making the site unsuitable for tephra analysis because of the risk of misidentification. Despite of low tephra concentrations, the results infer that tephra from Holocene volcanic eruptions have been deposited in the Peloponnesus, making this a first step towards a Holocene tephrochronology in the region.

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