Kelly, D. Clay 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)

Leg/Site/Hole:
ODP 113
ODP 113 689
ODP 113 690
Identifier:
2012-063191
georefid

10.1016/j.margeo.2012.02.003
doi

Creator:
Kelly, D. Clay
University of Wisconsin, Department of Geoscience, Madison, WI, United States
author

Nielsen, Tina M. J.
San Diego State University, United States
author

Schellenberg, Stephen A.
author

Identification:
Carbonate saturation dynamics during the Paleocene-Eocene Thermal Maximum; bathyal constraints from ODP Sites 689 and 690 in the Weddell Sea (South Atlantic)
2012
Marine Geology
Elsevier, Amsterdam, Netherlands
303-306
75-86
Spatiotemporal patterns of carbonate dissolution provide a critical constraint on carbon input during an ancient ( approximately 55.5Ma) 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 approximately 36ka 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 ( approximately 1,100m) while the calcite compensation depth remained below Site 690 ( approximately 1,900m) 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. Abstract Copyright (2012) Elsevier, B.V.
English
Serial
Coverage:Geographic coordinates:
North:-64.3100
West:1.1218East: 3.0600
South:-65.0938

Stratigraphy; biostratigraphy; C-13/C-12; calcium carbonate; carbon; carbonates; Cenozoic; chemostratigraphy; chronostratigraphy; cores; correlation; Foraminifera; Invertebrata; isotope ratios; isotopes; Leg 113; lithofacies; marine environment; Maud Rise; microfossils; Ocean Drilling Program; ODP Site 689; ODP Site 690; paleo-oceanography; Paleocene-Eocene Thermal Maximum; Paleogene; preservation; Protista; saturation; sedimentation; sedimentation rates; Southern Ocean; stable isotopes; Tertiary; Weddell Sea;

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