A stalactite record of four relative sea-level highstands during the Middle Pleistocene Transition

• Published in: Quaternary Science Reviews
• Main Authors: Lo Presti, V., Antonioli, F.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier Ltd 2017
• Subjects: 87Sr/86Sr age; Coral; U-Th dating; Pleistocene; Stable isotope; Western Europe; Interglacial(s); Sea level change; Speleothems; Antarctic; Antarc*; Ice Sheet
• Online Access: https://hdl.handle.net/20.500.12079/3179; https://doi.org/10.1016/j.quascirev.2017.08.008; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85027890459&doi=10.1016%2fj.quascirev.2017.08.008&partnerID=40&md5=f950f56d65599e49c9a7f7af3d8bf01a

Ice-sheet and sea-level fluctuations during the Early and Middle Pleistocene are as yet poorly understood. A stalactite from a karst cave in North West Sicily (Italy) provides the first evidence of four marine inundations that correspond to relative sea-level highstands at the time of the Middle Pleistocene Transition. The speleothem is located ∼97 m above mean sea level as result of Quaternary uplift. Its section reveals three marine hiatuses and a coral overgrowth that fixes the age of final marine ingression at 1.124 ± 0.2, thus making this speleothem the oldest stalactite with marine hiatuses ever studied to date. Scleractinian coral species witness light-limited conditions and water depth of 20–50 m. Integrating the coral-constrained depth with the geologically constrained uplift rate and an ensemble of RSL scenarios, we find that the age of the last marine ingression most likely coincides with Marine Isotope Stage 35 on the basis of a probabilistic assessment. Our findings are consistent with a significant Antarctic ice-sheet retreat. © 2017 Elsevier Ltd