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Basak, Chandranath; Martin, Ellen E; Kamenov, George D (2011): Pb isotopes in Cenozoic sediments of ODP Site 177-1090 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.780152, Supplement to: Basak, C et al. (2011): Seawater Pb isotopes extracted from Cenozoic marine sediments. Chemical Geology, 286(3-4), 94-108, https://doi.org/10.1016/j.chemgeo.2011.04.007

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Published: 2011 (exact date unknown) • DOI registered: 2012-05-24

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Abstract:
Nd and Pb isotopic compositions extracted from bulk deep sea sediments have been shown to be robust proxies for deep water circulation as well as weathering provenance and intensity over geologically young time scales. In this study we evaluated ten deep sea samples from Ocean Drilling Program (ODP) site 1090 ranging in age from mid Eocene to early-Miocene to test whether Pb isotopic compositions extracted from geologically older sediments record reliable seawater isotopic ratios and to evaluate the source of the extracted Pb. The sequential extraction protocol used in this study is similar to protocols reported for previous studies and produces acetic acid, hydroxylamine hydrochloride (HH) and residue fractions. Each extracted fraction was analyzed for Pb isotopes, rare earth elements (REEs), and a suite of major elements.
Similar 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios are recorded from the acetic acid and HH fractions for ~70-80% of the samples, suggesting that either the acetic acid dissolves Fe-Mn oxides or multiple phases are recording the same seawater isotopic value. Several indirect tests, such as Al mass balance, comparison of Sr isotopes in HH extracts to contemporaneous seawater Sr isotopes, and comparison of Nd isotopic compositions in HH extracts to published fossil fish teeth values, provide evidence that Pb isotopic compositions measured in our bulk HH extracts record bottom water values. The relationship between Pb, Mn and Ca concentrations in HH fractions indicates that Fe-Mn oxides and a Mn-bearing carbonate are the dominant phases contributing seawater Pb. Comparison of REE patterns derived from the HH fraction and total digestions of Fe-Mn nodule standards reveals that the trivalent REEs exhibit patterns consistent with the parent archive, but Ce can be fractionated during extraction. Ratios of REEs also produce unique fields for each fraction and can be used to test the purity of the seawater signal of the extraction protocol. Finally, an initial evaluation of Pb isotopic compositions in fossil fish indicates that this archive is not suitable for bottom water Pb isotope studies.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -43.952393 * Median Longitude: 16.762204 * South-bound Latitude: -50.185050 * West-bound Longitude: 8.899817 * North-bound Latitude: -42.913617 * East-bound Longitude: 63.936530
Date/Time Start: 1997-12-25T00:00:00 * Date/Time End: 1999-01-21T16:30:00
Event(s):
177-1090 * Latitude: -42.913617 * Longitude: 8.899817 * Date/Time: 1997-12-25T00:00:00 * Elevation: -3701.6 m * Penetration: 936.4 m * Recovery: 874.9 m * Location: South Atlantic Ocean * Campaign: Leg177 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 101 cores; 936.4 m cored; 0 m drilled; 93.4% recovery
177-1090D * Latitude: -42.913600 * Longitude: 8.900000 * Date/Time Start: 1997-12-28T23:25:00 * Date/Time End: 1997-12-30T00:55:00 * Elevation: -3702.1 m * Penetration: 225.9 m * Recovery: 213.64 m * Location: South Atlantic Ocean * Campaign: Leg177 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 225.9 m cored; 0 m drilled; 94.6 % recovery
183-1139A * Latitude: -50.185050 * Longitude: 63.936530 * Date/Time Start: 1999-01-15T10:23:00 * Date/Time End: 1999-01-21T16:30:00 * Elevation: -1415.3 m * Penetration: 694.2 m * Recovery: 356.88 m * Location: Indian Ocean * Campaign: Leg183 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 73 cores; 694.2 m cored; 0 m drilled; 51.4 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Basak, C; Martin, EE; Kamenov, GD (2011): (Table 3) Major element content in different bulk sediment fractions from ODP Site 177-1090. https://doi.org/10.1594/PANGAEA.780119
  2. Basak, C; Martin, EE; Kamenov, GD (2011): (Table 1) Pb isotopes in different bulk sediment fractions from ODP Site 177-1090. https://doi.org/10.1594/PANGAEA.780117
  3. Basak, C; Martin, EE; Kamenov, GD (2011): (Table 2) Pb isotopes in fossil fish teeth from ODP Site 177-1090. https://doi.org/10.1594/PANGAEA.780118
  4. Basak, C; Martin, EE; Kamenov, GD (2011): (Table 7) Pb, U, and Th concentrations in fossil and modern fish teeth. https://doi.org/10.1594/PANGAEA.780147
  5. Basak, C; Martin, EE; Kamenov, GD (2011): (Table 4) REE element content in different bulk sediment fractions from ODP Site 177-1090. https://doi.org/10.1594/PANGAEA.780120
  6. Basak, C; Martin, EE; Kamenov, GD (2011): (Table 6) Sr and Nd isotope duplicates of authigenic Fe-Mn phases of ODP Site 177-1090. https://doi.org/10.1594/PANGAEA.780144
  7. Basak, C; Martin, EE; Kamenov, GD (2011): (Table 5) Inter and intra laboratory Pb isotope duplicates of authigenic Fe-Mn phases of ODP Hole 183-1139A. https://doi.org/10.1594/PANGAEA.780134