An introduction to causes and consequences of Cretaceous sea-level changes (IGCP 609)

2020-01-01
Wagreich, Michael
Sames, Benjamin
Hart, Malcolm
Yılmaz, İsmail Ömer
The International Geoscience Programme Project IGCP 609 addressed correlation, causes and consequences of short-term sea-level fluctuations during the Cretaceous. Processes causing several ka to several Ma (third- to fourth-order) sea-level oscillations during the Cretaceous are so far poorly understood. IGCP 609 proved the existence of sea-level cycles during potential ice sheet-free greenhouse to hothouse climate phases. These sea-level fluctuations were most probably controlled by aquifer-eustasy that is altering land-water storage owing to groundwater aquifer charge and discharge. The project investigated Cretaceous sea-level cycles in detail in order to differentiate and quantify both short- and long-term records based on orbital cyclicity. High-resolution sea-level records were correlated to the geological timescale resulting in a hierarchy of sea-level cycles in the longer Milankovitch band, especially in the 100 ka, 405 ka, 1.2 Ma and 2.4 Ma range. The relation of sea-level highs and lows to palaeoclimate events, palaeoenvironments and biota was also investigated using multiproxy studies. For a hothouse Earth such as the mid-Cretaceous, humid-arid climate cycles controlling groundwater-related sea-level change were evidenced by stable isotope data, correlation to continental lake-level records and humid-arid weathering cycles.

Citation Formats
M. Wagreich, B. Sames, M. Hart, and İ. Ö. Yılmaz, “An introduction to causes and consequences of Cretaceous sea-level changes (IGCP 609),” CRETACEOUS CLIMATE EVENTS AND SHORT-TERM SEA-LEVEL CHANGES, vol. 498, pp. 1–8, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/45899.