Informace o publikaci

Late-Holocene palaeoenvironmental changes at Lake Esmeralda (Vega Island, Antarctic Peninsula) based on a multi-proxy analysis of laminated lake sediment

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PÍŠKOVÁ Anna ROMAN Matěj BULÍNOVÁ Marie POKORNÝ Matěj SANDERSON David C W CRESWELL Alan LIRIO Juan M CORIA Silvia H NEDBALOVÁ Linda LAMI Andrea MUSAZZI Simona VAN DE VIJVER Bart NÝVLT Daniel KOPALOVÁ Kateřina

Rok publikování 2019
Druh Článek v odborném periodiku
Časopis / Zdroj The Holocene
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://journals.sagepub.com/doi/10.1177/0959683619838033
Doi http://dx.doi.org/10.1177/0959683619838033
Klíčová slova Antarctica; lake sediment; OSL; palaeolimnology; late-Holocene climate; river piracy
Přiložené soubory
Popis We have studied laminated sediments from Lake Esmeralda, Vega Island, in order to reconstruct its history. We describe both inorganic and organic components of the sediment using a combination of the following analytical methods: x-ray fluorescence XRF, x-ray diffraction XRD, magnetic susceptibility measurement, chemical analysis for determination of cation exchange capacity, grain size determination, geochemical analyses - total inorganic carbon TIC, total organic carbon TOC, total sulphur TS, spectrophotometry, high-pressure liquid chromatography, and diatom assemblage and faunal remains characterization. The geochronology of the core was based on modelling optically stimulated luminescence ages and supported by laminae counting. The dating results imply a maximum age of 400 years for the 177-cm long core and a period covered of 200 years, suggesting quasi-annual laminae formation. Such a young age contradicts previous findings based on radiocarbon dating. Geomorphological evidence indicates that river capture isolated the lake catchment from upslope sediment delivery, effectively terminating accumulation 230 years ago. Conversely, our short-term palaeoenvironmental record yields a subdecadal temporal resolution, which is unparalleled in comparison with other Antarctic palaeolimnological studies. Our interpretations of the geochemical and mineralogical proxy data give us insight into the past lake catchment and waterbody evolution, and lead us to recognize periods of enhanced weathering, bottom anoxia and to distinguish major lake level changes.
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