Citation:

S0025-3227(97)00111-4

Name: Geochemical investigation and determination of hiatuses on Voering Plateau sediment records
Published: 1998
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The sediments recovered on ODP Leg 104 have been reported to be characterized by hiatuses. The hiatuses were defined by biostratigraphy and were believed to be caused by erosion related to temporary changes of bottom current composition and velocity. They have been associated with major paleoenvironmental changes, reorganization of global deep water production, and increased bottom water flows. Because of the importance of hiatuses for ongoing research, we decided to closely investigate the sedimentation history for the most significant Pliocene and Miocene biostratigraphic hiatuses by sedimentologic and geochemical means. The sedimentologic studies include clay mineral distributions, grain size data, and organic carbon concentrations. The geochemical studies include determination of 87/86Sr ratios, 10Be and Ir concentrations. The results of the sedimentologic studies suggest either that paleoenvironmental changes associated with hiatuses are not represented in the preserved sediments, or that the hiatuses are an artifact of interpretation of the biostratigraphic data. Strontium isotopes indicate continuous sedimentation for the interval investigated at Site 642, an interpretation confirmed by the steady decline in 10Be. 87/86Sr ratios in the interval from above and below proposed hiatuses H 2.2/2.3 and H2.1/2.2 at Site 643 display stronger changes with depth than expected by steady sedimentation. Ir data for this same interval indicate reduced sedimentation rates. Combining both, sedimentologic and geochemical evidence, the proposed hiatuses could not be confirmed and may represent preservation artifacts.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 67.519000 * Median Longitude: 1.791300 * South-bound Latitude: 67.225000 * West-bound Longitude: 1.033300 * North-bound Latitude: 67.715000 * East-bound Longitude: 2.928300

Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-08-08T01:45:00

Event(s):

104-642B * Latitude: 67.225000 * Longitude: 2.928300 * Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-06-29T20:15:00 * Elevation: -1294.0 m * Penetration: 221.1 m * Recovery: 214.61 m * Location: Norwegian Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 221.1 m cored; 0 m drilled; 97.1 % recovery

104-643A * Latitude: 67.715000 * Longitude: 1.033300 * Date/Time Start: 1985-08-03T06:07:00 * Date/Time End: 1985-08-08T01:45:00 * Elevation: -2780.0 m * Penetration: 565.2 m * Recovery: 458.29 m * Location: Norwegian Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 565.2 m cored; 0 m drilled; 81.1 % 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

Bruns, P; Dullo, W-C; Hay, WW et al. (1998): (Table 5) 10Be concentration of ODP Hole 104-642B. https://doi.org/10.1594/PANGAEA.758891
Bruns, P; Dullo, W-C; Hay, WW et al. (1998): (Table 9) Comparison of ages of ODP Holes 104-642B and 104-643A. https://doi.org/10.1594/PANGAEA.758895
Bruns, P; Dullo, W-C; Hay, WW et al. (1998): (Table 3) Strontium isotope ratios of ODP Holes 104-642B and 104-643A. https://doi.org/10.1594/PANGAEA.758890
Bruns, P; Dullo, W-C; Hay, WW et al. (1998): (Table 8) Mid-Miocene and younger hiatuses in ODP Hole 104-643A. https://doi.org/10.1594/PANGAEA.758893
Bruns, P; Dullo, W-C; Hay, WW et al. (1998): (Table 6) Ir concentration of ODP Hole 104-643A. https://doi.org/10.1594/PANGAEA.758892