engleski

LATE HOLOCENE ENVIRONMENTAL CHANGE: EVIDENCE FROM THE BLUE LAKE (MODRO JEZERO), CROATIA

The sedimentary sequence shows evidence of shallower phase of the lake from 2400 cal BP, and progressive deepening of the lake from app. 2000 cal BP, reaching its maximum during Medieval Warm Period (MWP). The shallow-water sequence is interrupted by several deep water phases and indicates evolution from a wetland prior to 1960 cal BP (lithological zone A). Within this zone, needle-shapes vivianite (iron phosphate mineral) rich layers occur (Fig. 7), which is stable under anoxic conditions, evident in anomalous P-enrichments in this zone. A deeper carbonate producing lake was formed from 1960 to 1390 cal BP (zone B) with frequent drought periods. The deepest lake with no visible discontinuities in sedimentation lasted for the next 850 years (zone C, between 1390 and 540 cal BP). During the LIA and modern period (zones D and E, from 540 to the present) the frequency of drying out of the lake increased but their duration was much shorter without significant organic carbon accumulation.

Modro jezero, paleolimnology, karst, Holocene

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