Late Campanian and Maastrichtian benthic foraminifera of El Kef, Tunesia

Late Campanian through Maastrichtian sea-level changes are examined based on lithology, macrofossils and benthic foraminifera at the Elles and El Kef sections in Tunisia. Six major sea-level regressions are identified during the late Campanian (74.4-74.2 Ma, 74.0-72.5 Ma), the Campanian-Maastrichtian transition (72.2-70.3 Ma), early Maastrichtian (69.6-69.3 Ma, 68.9-68.3 Ma), and late Maastrichtian (~65.5 Ma). Correlation of the Maastrichtian sea-level regressions with the oxygen isotope record of DSDP Site 525 in the middle latitude South Atlantic reveals that they coincide with episodes of high latitude cooling and appear to be of eustatic origin.

本研究基于突尼斯Elles与El Kef剖面的岩性、大化石及底栖有孔虫（benthic foraminifera）数据，对晚坎潘期至马斯特里赫特期的海平面变化展开研究。研究识别出6次主要的海退事件，分别发生于晚坎潘期（74.4~74.2 Ma、74.0~72.5 Ma）、坎潘-马斯特里赫特过渡期（72.2~70.3 Ma）、早马斯特里赫特期（69.6~69.3 Ma、68.9~68.3 Ma）以及晚马斯特里赫特期（约65.5 Ma）。将马斯特里赫特期的海退事件与南大西洋中纬度海域深海钻探计划（Deep Sea Drilling Program, DSDP）525站位的氧同位素记录进行对比后发现，上述海退事件与高纬度降温事件相吻合，且其成因应为全球海平面升降运动。