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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/202023
New Mediterranean speleothem records for glacial Terminations IV and III
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Abstract
Speleothem archives spanning the glacial terminations IV and III (TIV and TIII) are particularly scarce in
the western Mediterranean region. This study presents unprecedented geochemical records measured
on a speleothem from Minorca Island that grew continuously through the period from Marine Isotope
Stage 11 to 7. Its U/Th chronological model provides an accurate and excellent chronology for both
terminations which are recognized as intervals with slow growth rates. Hence revealing the difficulty of the
speleothem to grow during these periods of rapid melting, suggesting major distortions in the hydrological
conditions associated to glacial terminations. The Mg/Ca and d13C records indicate that deglaciations
were characterized by rapid transitions towards more humid conditions. However, the d18O results shows
a deglacial freshening that led in time the hydrological signal, with a remarkably larger time-led at the TIV.
These earlier depletions of the d18O are interpreted to mark the onset of the glacial melting, a freshening
signal that propagated through the surface ocean and transferred from the rain source into the stalagmite.
The co-existence of comparable deglacial d18O depleted episodes within the marine records, brings the
possibility to review the marine chronologies, independently of the orbital tuning. An exercise that indicates
a significant bias in the timing of the melting onset associated to TIV.
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TORNER PEREZ, Judit, et al. New Mediterranean speleothem records for glacial Terminations IV and III. Resum del pòster presentat a: 14th International Conference on Paleoceanography (ICP14). 29 August-2 September 2022. Bergen. (Poster Abstracts Topic 3: System Interactions and Thresholds - P3-039). [consulted: 18 of June of 2026]. Available at: https://hdl.handle.net/2445/202023