PANGAEA_810420 (Appendix) Oxygen and carbon isotopes in bulk sediments at DSDP Leg 74 Holes Shackleton, Nicholas J; Hall, Michael A (Appendix) Oxygen and carbon isotopes in bulk sediments at DSDP Leg 74 Holes 1984 PANGAEA Dataset Supplement to: Shackleton, Nicholas J; Hall, Michael A (1984): Carbon isotope data from Leg 74 sediments. In: Moore, TC Jr; Rabinowitz, PD; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 74, 613-619, https://doi.org/10.2973/dsdp.proc.74.116.1984 https://doi.pangaea.de/10.1594/PANGAEA.810420 Investigator Nicholas J Shackleton Earth Science Event label Latitude of event Longitude of event Elevation of event DEPTH, sediment/rock AGE δ18O, carbonate δ13C, carbonate geoscientificInformation 74-525 74-525A 74-527 74-528 74-529 Drilling/drill rig Leg74 see reference(s) Glomar Challenger 1980-06-10 1980-07-18 Complete -29.0707 -28.0415 1.7633 2.9853 0.1 m (DEPTH, sediment/rock) 475.86 m (DEPTH, sediment/rock) DSDP Deep Sea Drilling Project unrestricted CC-BY-3.0: Creative Commons Attribution 3.0 Unported English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

Leobener Str.

Bremen Bremen 28359 Germany online 1140 data points text/tab-separated-values

Carbon and oxygen isotope measurements were made in bulk sediments from the five sites drilled on Leg 74, covering much of the Cenozoic. These stable carbon isotope analyses document a lightening across the Cretaceous/Tertiary boundary (already documented by other workers), with a minimum about 0.2 Ma after the boundary; a trend to very heavy values in the late Paleocene; a lightening near the Paleocene/Eocene boundary to a second minimum early in the early Eocene; more positive values in the remainder of the Eocene with a minor peak immediately below the Eocene/Oligocene boundary, at which there is a lightening trend; a moderately positive peak in the middle Miocene, and a lightening toward the present, where the isotopically lightest values in the Cenozoic are to be found. The carbon isotope variations observed are largely a function of changes in the 13C content of oceanic dissolved inorganic carbon that resulted from alterations in the global carbon budget. Slight differences among sediments of the same age at different sites probably result from diagenetic changes, but do not obscure the major pattern, which has considerable potential value for stratigraphic correlation. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.810420"! ** Sediment depth is given in mbsf. Ages are estimated as described in Shackleton et al. 1984 (doi:10.2973/dsdp.proc.74.117.1984).

http://en.wikipedia.org/wiki/Kyr AGE http://en.wikipedia.org/wiki/Nicholas_Shackleton http://www.deepseadrilling.org/ DSDP https://doi.org/10.2973/dsdp.proc.74.116.1984 Carbon isotope data from Leg 74 sediments https://www-odp.tamu.edu:443/glomar.html Glomar Challenger DIF 9.4 2026-05-01