Kelly, Daniel Clay; Nielsen, Tina M J; Schellenberg, Stephen A (2012): Analysis of an ancient global warming event, the Paleocene-Eocene thermal maximum, under examination from ODP Holes 113-689B and 113-690B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.787773, Supplement to: Kelly, DC et al. (2012): Carbonate saturation dynamics during the Paleocene-Eocene thermal maximum: Bathyal constraints from ODP sites 689 and 690 in the Weddell Sea (South Atlantic). Marine Geology, 303-306, 75-86, https://doi.org/10.1016/j.margeo.2012.02.003
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Abstract:
Spatiotemporal patterns of carbonate dissolution provide a critical constraint on carbon input during an ancient (~55.5 Ma) global warming event known as the Paleocene-Eocene thermal maximum (PETM), yet the magnitude of lysocline shoaling in the Southern Ocean is poorly constrained due to limited spatial coverage in the circum-Antarctic region. This shortcoming is partially addressed by comparing patterns of carbonate sedimentation at the Site 690 PETM reference section to those herein reconstructed for nearby Site 689. Biochemostratigraphic correlation of the two records reveals that the first ~36 ka of the carbon isotope excursion (CIE) signaling PETM conditions is captured by the Site 689 section, while the remainder of the CIE interval and nearly all of the CIE recovery are missing due to a coring gap. A relatively expanded stratigraphy and higher carbonate content at mid-bathyal Site 689 indicate that dissolution was less severe than at Site 690. Thus, the bathymetric transect delimited by these two PETM records indicates that the lysocline shoaled above Site 689 (~1,100 m) while the calcite compensation depth remained below Site 690 (~1,900 m) in the Weddell Sea region. The ensuing recovery of carbonate sedimentation conforms to a bathymetric trend best explained by gradual lysocline deepening as negative feedback mechanisms neutralized ocean acidification. Further, biochemostratigraphic evidence indicates the tail end of the CIE recovery interval at both sites has been truncated by a hiatus most likely related to vigorous production and advection of intermediate waters.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -64.946333 * Median Longitude: 1.836567 * South-bound Latitude: -65.161000 * West-bound Longitude: 1.204900 * North-bound Latitude: -64.517000 * East-bound Longitude: 3.099900
Date/Time Start: 1987-01-16T08:00:00 * Date/Time End: 1987-01-21T07:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Kelly, DC; Nielsen, TMJ; Schellenberg, SA (2012): (Appendix A) Stable isotopes, carbonate, size fraction and sedimentation rate from ODP Holes 113-689B and 113-690B. https://doi.org/10.1594/PANGAEA.787742
- Kelly, DC; Nielsen, TMJ; Schellenberg, SA (2012): (Appendix B) Planktic foraminiferal assemblages from ODP Holes 113-689B and 113-690B. https://doi.org/10.1594/PANGAEA.787746
- Kelly, DC; Nielsen, TMJ; Schellenberg, SA (2012): (Table 1) Tie points used to create ages and distances to the Paleocene-Eocene boundary by the research of ODP Holes 113-689B and 113-690B. https://doi.org/10.1594/PANGAEA.787736