Hyun, Sangmin; Ortiz, Joseph D; Raymo, Maureen E; Taira, Asahiko (1999): Ages, sedimentation rates and geochemical composition of ODP Site 162-983 sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.805143, Supplement to: Hyun, S et al. (1999): Low-frequency oscillations in Site 983 sediments: relationships between carbonate and productivity proxies. In: Raymo, ME; Jansen, E; Blum, P; Herbert, TD (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 162, 1-11, https://doi.org/10.2973/odp.proc.sr.162.019.1999
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Abstract:
A geochemical study of sediments from Ocean Drilling Program Site 983 was conducted to examine low-frequency variations in carbonate content as expressed by blue-band reflectance (450-500 nm) over the last 1.2 Ma. Sedimentary percent organic carbon, percent carbonate, and excess barium (Ba[ex]) were used as the primary tools to evaluate the factors responsible for these long-term changes. We observe positive correlation between the mass-accumulation rate of various biogenic components and the mass-accumulation rate of Ba(ex), especially in sediments younger than ~600 ka. Deeper in the section (~600-1200 ka), the correlation between Ba(ex) and the other biogenic tracers is weak. The lack of correlation between Ba(ex) and biogenic carbonate likely results either from a higher supply of terrigenous material at that time (which confounds Ba[ex] estimation), or remobilization of Ba resulting from low pore-water sulfate ion concentrations, or both. Nonbiogenic sediments at Site 983, represented by Th, K2O, and the molar Ti/Al ratio, exhibit cyclic variations that represent mixing between continental and oceanic (i.e., basaltic) terrigenous sources. The timing of these cycles matches that of the major glacial-interglacial cycles, which suggests that they result from the supply of continental material as ice-rafted debris during glacial periods and fine-grained basaltic material by bottom currents during interglacial periods. Given these observations, the most likely causes for the low-frequency carbonate variations observed in the Site 983 sediments are shifts in surface productivity and, to a lesser extent, dilution by the input of terrigenous material.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 60.403500 * Longitude: -23.640667
Date/Time Start: 1995-07-21T00:00:00 * Date/Time End: 1995-07-24T00:00:00
Event(s):
162-983 * Latitude: 60.403500 * Longitude: -23.640667 * Date/Time Start: 1995-07-21T00:00:00 * Date/Time End: 1995-07-24T00:00:00 * Elevation: -1983.7 m * Penetration: 766.5 m * Recovery: 798 m * Location: South Atlantic Ocean * Campaign: Leg162 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 82 cores; 766.5 m cored; 0 m drilled; 104.1% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets
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Datasets listed in this publication series
- Hyun, S; Ortiz, JD; Raymo, ME et al. (1999): (Table 1) Age model and sedimentation rates of ODP Site 162-983 sediments. https://doi.org/10.1594/PANGAEA.805138
- Hyun, S; Ortiz, JD; Raymo, ME et al. (1999): (Table 2) Depths and ages of discrete samples from ODP Site 162-983 sediments. https://doi.org/10.1594/PANGAEA.805139
- Hyun, S; Ortiz, JD; Raymo, ME et al. (1999): (Table 4) Major element oxides of ODP Site 162-983 bulk sediments. https://doi.org/10.1594/PANGAEA.805141
- Hyun, S; Ortiz, JD; Raymo, ME et al. (1999): (Table 5) Minor element concentrations of carbonate-free sediments from ODP Site 162-983. https://doi.org/10.1594/PANGAEA.805142
- Hyun, S; Ortiz, JD; Raymo, ME et al. (1999): (Table 3) Carbon and silica content and concentration of excess barium of ODP Site 162-983 sediments. https://doi.org/10.1594/PANGAEA.805140