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Article

Speleothem Records of the Hydroclimate Variability throughout the Last Glacial Cycle from Manita peć Cave (Velebit Mountain, Croatia)

1
Department of Geography, University of Zadar, 23000 Zadar, Croatia
2
Croatian Geological Survey, 10000 Zagreb, Croatia
3
School of Geography, Faculty of Science, The University of Melbourne, Melbourne, VIC 3010, Australia
4
School of Earth Sciences, University of Melbourne, Melbourne, VIC 3053, Australia
5
Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
*
Author to whom correspondence should be addressed.
Academic Editors: Mohammad Valipour and Jesus Martinez-Frias
Geosciences 2021, 11(8), 347; https://doi.org/10.3390/geosciences11080347
Received: 5 July 2021 / Revised: 4 August 2021 / Accepted: 17 August 2021 / Published: 19 August 2021
(This article belongs to the Special Issue Changing Quaternary Environment in the Mediterranean)
We present stable carbon (δ13C) and oxygen (δ18O) isotope records from two partially coeval speleothems from Manita peć Cave, Croatia. The cave is located close to the Adriatic coast (3.7 km) at an elevation of 570 m a.s.l. The site experienced competing Mediterranean and continental climate influences throughout the last glacial cycle and was situated close to the ice limit during the glacial phases. U-Th dating constrains the growth history from Marine Isotope Stage (MIS) 5 to MIS 3 and the transition from MIS 2 to MIS 1. 14C dating was used to estimate the age of the youngest part of one stalagmite found to be rich in detrital thorium and thus undatable by U-Th. On a millennial scale, δ18O variations partly mimic the Dansgaard–Oeschger interstadials recorded in Greenland ice cores (Greenland Interstadials, GI) from GI 22 to GI 13. We interpret our δ18O record as a proxy for variations in precipitation amount and/or moisture sources, and the δ13C record is interpreted as a proxy for changes in soil bioproductivity. The latter indicates a generally reduced vegetation cover towards MIS 3–MIS 4, with shifts of ~8‰ and approaching values close to those of the host rock. However, even during the coldest phases, when a periglacial setting and enhanced aridity sustained long-residence-time groundwater, carbonic-acid dissolution remains the driving force of the karstification processes. Speleothem morphology follows changes in environmental conditions and complements regional results of submerged speleothems findings. Specifically, narrow sections of light porous spelaean calcite precipitated during the glacial/stadial sea-level lowstands, while the warmer and wetter conditions were marked with compact calcite and hiatuses in submerged speleothems due to sea-level highstands. Presumably, the transformation of this littoral site to a continental one with somewhat higher amounts of orographic precipitation was a site-specific effect that masked regional environmental changes. View Full-Text
Keywords: speleothem; cave; hydroclimate; palaeoenvironmental changes; Croatia speleothem; cave; hydroclimate; palaeoenvironmental changes; Croatia
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MDPI and ACS Style

Surić, M.; Bajo, P.; Lončarić, R.; Lončar, N.; Drysdale, R.N.; Hellstrom, J.C.; Hua, Q. Speleothem Records of the Hydroclimate Variability throughout the Last Glacial Cycle from Manita peć Cave (Velebit Mountain, Croatia). Geosciences 2021, 11, 347. https://doi.org/10.3390/geosciences11080347

AMA Style

Surić M, Bajo P, Lončarić R, Lončar N, Drysdale RN, Hellstrom JC, Hua Q. Speleothem Records of the Hydroclimate Variability throughout the Last Glacial Cycle from Manita peć Cave (Velebit Mountain, Croatia). Geosciences. 2021; 11(8):347. https://doi.org/10.3390/geosciences11080347

Chicago/Turabian Style

Surić, Maša, Petra Bajo, Robert Lončarić, Nina Lončar, Russell N. Drysdale, John C. Hellstrom, and Quan Hua. 2021. "Speleothem Records of the Hydroclimate Variability throughout the Last Glacial Cycle from Manita peć Cave (Velebit Mountain, Croatia)" Geosciences 11, no. 8: 347. https://doi.org/10.3390/geosciences11080347

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