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Biomarker hydrogen isotope composition (D) as proxy for Holocene hydroclimatic change and seismic activity in SW Peloponnese, Greece
Stockholm University, Faculty of Science, Department of Geological Sciences. Navarino Environmental Observatory, Greece.
Stockholm University, Faculty of Science, Department of Physical Geography. Navarino Environmental Observatory, Greece.
Stockholm University, Faculty of Science, Department of Physical Geography. Navarino Environmental Observatory, Greece.
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Number of Authors: 62018 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 33, no 5, p. 563-574Article in journal (Refereed) Published
Abstract [en]

We present a 6000-year-long record tracing hydroclimate changes in SW Greece, based on hydrogen isotope composition of aquatic plant-derived n-C-23 alkanes (D-C23) in a sediment core from the Messenian plain, Peloponnese. The D-C23 record co-varies with other eastern Mediterranean records, suggesting relatively wetter conditions c. 6-4.5ka, followed by progressively drier conditions leading up to maximum aridity c. 2.8 ka. This arid phase was interrupted by a shift in D-C23 between 3.3 and 3.1ka inferring wetter conditions and/or tentative responses to anthropogenic water regulating activities during the Late Bronze Age. After 2.7ka, a return to more humid conditions was followed by increased dryness and stronger seasonality contrasts from c. 2.0ka. The D-C23 record shows three short-lived excursions (5.7, 5.3, 2.8ka), where isotope values dropped by >20 parts per thousand and immediately stabilized again. The events were paralleled by abrupt increases in sedimentation rates. We hypothesize that the isotopic shifts represent a response to mixing of ground water systems during tectonic events, followed by sealing of seismically derived cracks in the active fault. The outcome of the study is promising for future expansion of isotope-based proxies on sediments in the region, to reconstruct both hydroclimate and past seismic activity.

Place, publisher, year, edition, pages
2018. Vol. 33, no 5, p. 563-574
Keywords [en]
biomarkers, n-alkanes, paleoclimate, Peloponnese, Greece, seismicity, stable hydrogen isotopes
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-158360DOI: 10.1002/jqs.3036ISI: 000437134000009OAI: oai:DiVA.org:su-158360DiVA, id: diva2:1238402
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2019-04-02Bibliographically approved
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Norström, ElinKatrantsiotis, ChristosRisberg, JanSmittenberg, Rienk H.Bjursäter, Stefan
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