engleski

350 kyrs of increasing aridity reflected by geophysical proxies from the LPS of Zmajevac, Croatia

Loess-paleosol sequences (LPSs) are aeolian terrestrial paleoclimate archives able to conserve several hundreds of thousands years of climate history. Loess deposits cover at least 10 % of the northern hemisphere continental masses (Pécsi, 1990) and provide adequate properties to conserve climate changes imprinted in the stratigraphically analyzable rock-magnetic, granulometric, and colorimetric properties (e.g. Schaetzl et al., 2018). LPSs are seldomly investigated a) at a very high (2 cm) and continuous resolution as conducted at Zmajevac and b) with multi-disciplinary proxy parameters as acquired here: rock-magnetic, granulometric and colorimetric properties. The Zmajevac LPS spans 22 m and archives a quasi-non-disturbed depositional history, with only three erosional layers observed in the field. We use the postIR IRSL290 luminescence signal of feldspar to provide reliable time controls (Wacha et al., in review) enabling an independently dated correlative age model based on magnetic susceptibility derived parameters. Granulometric and colorimetric parameters are thus incorporated into the derived age model. In this contribution we show first results detecting precise changes of interglacial / glacial conditions for the last three eccentricity cycles (~ 300 kyrs). Furthermore, rock-magnetic parameters across the Zmajevac LPS are interpreted as a precipitation indicator and compared to observations from other LPSs located several hundreds of kilometers away. The combination of two different age determinations (correlative, compared to global climate models and stacks (e.g., LR04 stack, Lisiecki & Raymo, 2005) and postIR-IRSL290 dating) allows further implications for millennial scale climate variability.

rock-magnetic properties, grain-size, colorimetric properties, Zmajevac loess section

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