Sea-level history of past interglacial periods from uranium-series dating of corals, Curaçao, Leeward Antilles islands

• Main Authors: Muhs, Daniel R, Pandolfi, John M., Simmons, Kathleen R., Schumann, R. Randall
• Format: Text
• Language: unknown
• Published: DigitalCommons@University of Nebraska - Lincoln 2012
• Subjects: Curaçao; Corals; Reefs; U-series dating; Uplift rate; Last interglacial; Penultimate interglacial; Sea level; Earth Sciences; Geology; Oceanography and Atmospheric Sciences and Meteorology; Other Earth Sciences; Other Environmental Sciences; Antarc*; Antarctica; Greenland; Ice Sheet
• Online Access: https://digitalcommons.unl.edu/usgsstaffpub/1289; https://digitalcommons.unl.edu/context/usgsstaffpub/article/2296/viewcontent/Muhs_et_al._2012_QR_CuraçaoSeaLevels.pdf

Curaçao has reef terraces with the potential to provide sea-level histories of interglacial periods. Ages of the Hato (upper) unit of the “Lower Terrace” indicate that this reef dates to the last interglacial period, Marine Isotope Stage (MIS) 5.5. On Curaçao, this high sea stand lasted at least 8000 yr (~126 to ~118 ka). Elevations and age of this reef show that late Quaternary uplift rates on Curaçao are low, 0.026–0.054 m/ka, consistent with its tectonic setting. Ages of ~200 ka for corals from the older Cortalein unit of the Lower Terrace correlate this reef to MIS 7, with paleo-sea level estimates ranging from −3.3 m to +2.3 m. The estimates are in agreement with those for MIS 7 made fromother localities and indicate that the penultimate interglacial period was a time of significantwarmth, on a parwith the present interglacial period. The ~400 ka (MIS 11) Middle Terrace I on Curaçao, dated by others, may have formed froma paleo-sea level of+8.3 to+10.0 m, or (less likely)+17 mto+20 m. The lower estimates are conservative compared to previous studies, but still require major ice sheet loss from Greenland and Antarctica.