 |
| Titel |
High resolution multiproxy records from the last 4500 yr cal BP from Lake Shkodra (Albania/Montenegro boundary) |
| VerfasserIn |
Giovanni Zanchetta, Aurelien Van Welden, Ilaria Baneschi, Russell Drysdale, Laura Sadori, Neil Roberts, Marco Giardini, Luigi Dallai |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036420
|
|
|
|
|
|
| Zusammenfassung |
| Lake Shkodra is a large (45 km long, 15 km wide) and shallow (5 m mean depth) lake,
developed on a mainly carbonate substratum, and located in the Mediterranean climatic belt
of Albania and Montenegro. Gravity cores of its recent sedimentary fill (mixed
calcareous/siliciclastic clayey silts) representing ca the last 4500 yr cal BP were analysed for
exploring the paleoclimate and paleoenvironmental evolution of this poorly known sector of
the Mediterranean basin. The record is made more valuable by the presence of four
well known tephra layers from southern Italian volcanoes, which allow detailed
correlations with others archives in the central Mediterranean (Sulpizio et al., 2009).
Sedimentological, mineralogical and chemical analyses suggest that the carbonate
fraction is mainly endogenic. Preliminary diatom analysis suggests that the lake water
has remained fresh over the last 4.5 ka. Data on the isotopic composition of the
rainfall in the Adriatic basin and the few data available on the lake’s superficial
waters suggest that the isotope composition of the lake is mainly dominated by the
local hydrological balance driven by the amount of rainfall, which arrives from
different sources and which experiences limited evaporative effects. Oxygen stable
isotope composition of bulk samples suggests that the lake experienced two main
humid phases at ca 4500-4200 yr cal BP and at ca 2400-2000 yr cal BP, separated by
drier conditions. Prominent dry phases occur at ca. 4100, 3200, 1800, 1400, and
1150 cal yr BP. Pollen data only partially corroborate this owing to the peculiar
morphology of the area surrounded by high mountains and characterised by an elevated
rainfall regime. However, some interesting patterns can be identified with AP pollen
concentration.
Sulpizio, R., Van Welden, A., Caron, B., Zanchetta, G., 2009 The Holocene
tephrostratigraphic record of Lake Shkodra (Albania and Montenegro). Journal of Quaternary
Science, DOI: 10.1002/jqs.1334 |
|
|
|
|
|
|