Oxygen 18 and Carbon 13 Isotopes from Bulk Carbonate Samples, Leg 47B

Mass wasting of Atlantic continental margins following the Chicxulub impact event

“…Nannofossils are indicative of zone NP1 (Blechschmidt, 1979), and common, well-preserved Thoracosphaera cysts are found at 39 cm within section 398D-41-2, immediately above the K-P boundary. Stable isotope analysis of bulk carbonate delineates a ‫‰3.1מ‬ shift in d 13 C precisely at the biostratigraphic K-P boundary that is consistent in magnitude and direction with stable isotope results from other, better known K-P boundary sections (Létolle, 1979). Furthermore, our observations show that a 1-mm-thick layer of green spherules is associated with the biostratigraphic K-P boundary (Fig.…”

“…The spherule bed is buried by ϳ2 cm of white chalk at the base of bed D. Greenish sediments filling burrows in the chalk have d 13 C ratios typical of overlying reddish-brown Paleocene sediment, whereas the white chalk has a d 13 C chemistry similar to underlying Cretaceous sediments (Létolle, 1979). The chalk may represent the last fine-grained sediment suspended in the water column during the initial slump.…”

Paleooceanography of the Mesogean sea based on ostracods of the northern Tunisian continental shelf between the late Cretaceous and early paleogene

“…It must be noted that a regional or local change in climate can be of great importance even at the northern hemisphere scale. The paleooceanographic modifications in the N. Atlantic at the end of the Paleocene assessed by isotopic measures (BoERSMA et al 1979;HAQ et al 1977 andLETOLLE 1979) support this statement.…”

Central Paratethys paleoenvironment during the Badenian (Middle Miocene): evidence from foraminifera and stable isotope (δ13C and δ18O) study in the Vienna Basin (Slovakia)

“…Comparison of DNV bulk carbonate isotope ratios to the Middle Miocene data from Atlantic (Létolle 1979;Renard et al 1979) and Mediterranean (Mader et al 2004) shows that the DNV data are closest to Mediterranean ones (Fig. 5).…”

“…Savin et al 1975;Zachos et al 2001) and a major Antarctic ice sheet expansion is reflected in increasing foraminiferal d 18 O values in deep-sea records. 1979;Renard 1979); Mediterranean (Mader et al 2004) Our benthic isotopes are very positive and show increasing oxygen trend (average +2%) from NN5 to NN6 (Fig. 3), implying that the Vienna Basin (accordingly Paratethys) has been affected by global cooling as well.…”