Hiatuses on Vøring Plateau, sedimentary gaps or preservation artifacts?

Bruns, Peter, Dullo, Wolf-Christian, Hay, William W., Frank, Martin and Kubik, Peter (1998) Hiatuses on Vøring Plateau, sedimentary gaps or preservation artifacts? Marine Geology, 145 (1-2). pp. 61-84. DOI 10.1016/S0025-3227(97)00111-4.

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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 Full-size image (<1 K)Sr 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. Full-size image (<1 K)Sr ratios in the interval from above and below proposed hiatuses H Full-size image (<1 K) and Full-size image (<1 K) 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.

Document Type: Article
Keywords: hiatuses; strontium isotopes; sedimentology; geochemistry; ODP Leg 104
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1016/S0025-3227(97)00111-4
ISSN: 0025-3227
Projects: ODP
Date Deposited: 18 Feb 2008 17:24
Last Modified: 09 Jan 2018 13:39
URI: http://eprints.uni-kiel.de/id/eprint/2513

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