Late Eocene to early Oligocene oxygen and carbon isotope records and biogenic barium accumulation rates in Maud Rise, Kerguelen Plateau and Agulhas Ridge


The late Eocene through early Oligocene (40-33 Ma) represents a transition from a warm-house to icehouse climate mode, with the expansion of Antarctic glaciation shortly after the Eocene/Oligocene (E/O) boundary. Identifying the driving mechanisms for this climatic event remains controversial and depends on a better understanding of how the different environmental changes correlate to each other. We investigate the spatial and temporal variation in export productivity based on biogenic Ba (bio-Ba) from different Ocean Drilling Program (ODP) Sites in the Southern Ocean focusing on possible mechanisms that controlled them as well as the correlation of export productivity changes to changes in the global carbon cycle. We document two significant Southern Ocean region high export productivity late-Eocene events (ca. 37 and 33.5 Ma). We propose that paleoceanographic changes that followed the Southern Ocean gateways opening, along with more variable increases in circulation driven by episodic growth and decay of the Antarctic ice sheet, drove enhanced Southern Ocean export production in the late Eocene through the early Oligocene.

Metadata Access
Creator Faria, Gabrielle R ORCID logo; Lazarus, David B; Renaudie, Johan ORCID logo; Stammeier, Jessica; Özen, Volkan; Struck, Ulrich
Publisher PANGAEA
Publication Year 2024
Funding Reference Federal Ministry of Education and Research Crossref Funder ID 57429681 Make our Planet Great Again, German Research Initiative
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Resource Type Bundled Publication of Datasets; Collection
Format application/zip
Size 8 datasets
Discipline Earth System Research
Spatial Coverage (3.100W, -64.517S, 78.998E, -42.914N)
Temporal Coverage Begin 1987-01-16T08:00:00Z
Temporal Coverage End 1997-12-28T14:55:00Z