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Gehrke, Gretchen E; Blum, Joel D; Meyers, Philip A (2009): Geochemistry and Hg isotopic composition of mid-Pleistocene sapropel of ODP Hole 161-974C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.783370, Supplement to: Gehrke, GE et al. (2009): The geochemical behavior and isotopic composition of Hg in a mid-Pleistocene western Mediterranean sapropel. Geochimica et Cosmochimica Acta, 73(6), 1651-1665, https://doi.org/10.1016/j.gca.2008.12.012

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Abstract:
The concentrations of mercury (Hg) and other trace metals (Ni, Cu, Zn, Mo, Ba, Re, U) and the Hg isotopic composition were examined across a dramatic redox and productivity transition in a mid-Pleistocene Mediterranean Sea sapropel sequence. Characteristic trace metal enrichment in organic-rich layers was observed, with organic-rich sapropel layers ranging in Hg concentration from 314 to 488 ng/g (avg = 385), with an average enrichment in Hg by a factor of 5.9 compared to organic-poor background sediments, which range from 39 to 94 ng/g Hg (avg = 66). Comparison of seawater concentrations and sapropel accumulations of trace metals suggests that organic matter quantitatively delivers Hg to the seafloor. Near complete scavenging of Hg from the water column renders the sapropel Hg isotopic composition representative of mid-Pleistocene Mediterranean seawater. Sapropels have an average d202Hg value of -0.91 per mil ± 0.15 per mil (n = 5, 1 SD) and D199Hg value of 0.11 per mil ± 0.03 per mil (n = 5, 1 SD). Background sediments have an average d202Hg of -0.76 per mil ± 0.16 per mil (n = 5, 1 SD) and D199Hg of 0.05 per mil ± 0.01 per mil (n = 5, 1 SD), which is indistinguishable from the sapropel values. We suggest that the sapropel isotopic composition is most representative of the mid-Pleistocene Tyrrhenian Sea.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 40.355800 * Longitude: 12.142210
Date/Time Start: 1995-05-08T23:45:00 * Date/Time End: 1995-05-10T21:00:00
Event(s):
161-974C * Latitude: 40.355800 * Longitude: 12.142210 * Date/Time Start: 1995-05-08T23:45:00 * Date/Time End: 1995-05-10T21:00:00 * Elevation: -3464.0 m * Penetration: 204.5 m * Recovery: 199.85 m * Location: Tirreno Sea * Campaign: Leg161 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 204.5 m cored; 0 m drilled; 97.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Gehrke, GE; Blum, JD; Meyers, PA (2009): (Table 4) Hg isotope composition of ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.783365
  2. Gehrke, GE; Blum, JD; Meyers, PA (2009): (Table S1) Major element concentrations of ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.783367
  3. Gehrke, GE; Blum, JD; Meyers, PA (2009): (Table S2) Ratios of major elements to Al concentrations in ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.783369
  4. Gehrke, GE; Blum, JD; Meyers, PA (2009): (Table 2a) TOC and trace metal concentrations in ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.783363
  5. Gehrke, GE; Blum, JD; Meyers, PA (2009): (Table 1a) Trace metal concentrations in sequential digests of ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.783362
  6. Gehrke, GE; Blum, JD; Meyers, PA (2009): (Table 2b) Ratios of trace metal to Al concentrations in ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.783364