Stable carbon and oxygen isotope ratios of Paleogene planktonic foraminifera from the Maud Rise ...

• Main Authors: Stott, Lowell D, Kennett, James P, Shackleton, Nicholas J, Corfield, Richard M
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1990
• Subjects: Drilling/drill rig; Composite Core; Leg113; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic; Planktonic foraminifera; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.726370; https://doi.pangaea.de/10.1594/PANGAEA.726370

The oxygen and carbon isotopic composition has been measured for numerous Paleogene planktonic foraminifer species from Maud Rise, Weddell Sea (ODP Sites 689 and 690), the first such results from the Antarctic. The results provide information about large-scale changes in the evolution of temperatures, seasonally, and structure of the upper water column prior to the development of a significant Antarctic cryosphere. The early Paleocene was marked by cooler surface-water conditions compared to the Cretaceous and possibly a less well developed thermocline. The late Paleocene and early Eocene saw the expansion of the thermocline as Antarctic surface waters became warm-temperate to subtropical. The late Paleocene to early Eocene thermal maximum was punctuated by two brief excursions during which time the entire Antarctic water column warmed and the meridional temperature gradient was reduced. The first of these excursions occurred at the Paleocene/Eocene boundary, in association with a major extinction in deep ... : Supplement to: Stott, Lowell D; Kennett, James P; Shackleton, Nicholas J; Corfield, Richard M (1990): The evolution of Antarctic surface waters during the Paleogene: inferences from the stable isotopic composition of planktonic foraminifers, ODP Leg 113. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 849-863 ...