Holocene lake development of two Dalmatian lagoons (Malo and Veliko Jezero, Isle of Mljet) in respect to changes in Adriatic sea level and climate

Autor: J. Müller, Sybille Wunsam, Roland Schmidt
Rok vydání: 1999
Předmět:
Zdroj: Palaeogeography, Palaeoclimatology, Palaeoecology. 146:251-281
ISSN: 0031-0182
DOI: 10.1016/s0031-0182(98)00147-3
Popis: Within the Austrian IGBP/PAGES project “Palaeolimnology of Adriatic–Alpine Lakes” (PAAL), geochemical and diatom analyses were performed on sediment cores of Malo and Veliko Jezero, two karstic coastal lakes on the island Mljet, Croatia. Combined with diatom calibration, they provide evidence of remarkable environmental changes during the Holocene. The formation of the lakes in the early Holocene was triggered by a rise in the Adriatic sea level from approximately −50 to −30 m, which resulted in the transmission of seawater through karst, and by a temporary increase in precipitation. The onset of this pluvial period was dated in Malo Jezero at 8.4 kyr B.P. and had its maximum approximately 7–6 kyr B.P. It was briefly interrupted by a dryer episode from about 7.2 until 7.1 kyr B.P. Between 6 and 5.5 kyr B.P., a transition to the present Mediterranean climate occurred. The marine ingression into Veliko Jezero through the Soline channel, with a present depth of 2.5 m, took place about 5 kyr B.P. From 5 to 4 kyr B.P., the oscillating sea level gradually approached the present value. A tephra layer at 7.3 kyr B.P. in both lakes was related to sudden environmental changes that were probably caused by tectonic movements accompanying Italian volcanism.
Databáze: OpenAIRE
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