Late Santonian-early Campanian lake-level fluctuations in the Songliao Basin, NE China and their relationship to coeval eustatic changes

摘要: Abstract In contrast to glacio-eustasy, which is mainly controlled by the waxing and waning of continental ice sheets during icehouse climate stages, concept aquifer or limno-eustasy suggests that effects groundwater storage release may have been main driver short-term (10s kyr a few Myr) sea-level changes in Cretaceous ice-free world. Presumably climate-controlled hydrological cycling could change water volumes reservoirs oceans transporting between continents oceans, resulting out-of-phase relation lake sea levels. present study, we lake-level fluctuations Members 1 2 Nenjiang Formation (late Santonian-early Campanian) Songliao Basin are indicated basin-scale correlations Fischer Plots based on natural gamma-ray logging data. Meanwhile, Al/K ratios SK1 core indicate precipitation forced basin. Compared global changes, show an with variations lacustrine phase basin, suggesting climate-driven transport late Campanian. During marine-lake connectivity (basal Member 1), although marine regression-driven decrease corresponds salinity stratification strongly reducing conditions, increasing basin implies cycle transported more from toward continents. Based results suggest levels