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Murphy, Daniel P; Thomas, Deborah J (2013): Nd isotopes of ODP Sites 146-893 and 167-1017 samples [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.816402, Supplement to: Murphy, DP; Thomas, DJ (2010): The negligible role of intermediate water circulation in stadial–interstadial oxygenation variations along the southern California margin: Evidence from Nd isotopes. Quaternary Science Reviews, 29(19-20), 2442-2450, https://doi.org/10.1016/j.quascirev.2010.05.021

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Abstract:
Changes in the source of intermediate waters to the southern California margin may have caused variations in seafloor oxygen levels on stadial–interstadial time scales. We test this hypothesis using the Nd isotopic composition of benthic foraminifera and fossil fish debris from ODP Sites 893 and 1017 to track the composition of intermediate waters across interstadials 8-14 (~37-52 ka) during Marine Isotope Stage 3. The epsilon-Nd values of waters bathing the seafloor at Site 893 were typically ~-9 and those bathing Site 1017 were ~-7, both of which are significantly less radiogenic than waters that had originated in either the North Pacific or Southern Ocean (by the time such waters reached the southern California margin). Detrital silicate epsilon-Nd values of nearly -12 suggest that this offset toward lower epsilon-Nd values was likely caused by boundary scavenging that partially overprinted the water mass composition with local/regional fluvial Nd inputs. In spite of the evidence for boundary scavenging, the lack of systematic seawater Nd isotope changes on a stadial–interstadial basis suggests that the provenance of the intermediate waters did not change, and that the waters were derived from the Southern Ocean. Instead, changes in local/regional sea surface productivity may have caused the recorded changes in seafloor oxygenation.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 34.411217 * Median Longitude: -120.571500 * South-bound Latitude: 34.287500 * West-bound Longitude: -121.107000 * North-bound Latitude: 34.535000 * East-bound Longitude: -120.036000
Date/Time Start: 1992-11-20T10:30:00 * Date/Time End: 1996-05-28T06:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Murphy, DP; Thomas, DJ (2010): (Table 1) Nd isotope ratios of silicate samples of ODP Holes 146-893A and 167-1017D. https://doi.org/10.1594/PANGAEA.816399
  2. Murphy, DP; Thomas, DJ (2010): (Table 2a) Nd isotope ratios of fish debris and foraminifera from ODP Holes 146-893A. https://doi.org/10.1594/PANGAEA.816400
  3. Murphy, DP; Thomas, DJ (2010): (Table 2b) Nd isotope ratios of fish debris and foraminifera from ODP Holes 167-1017E. https://doi.org/10.1594/PANGAEA.816401