Rea, David K; Thiede, Jörn (1981): Linear sedimentation rates and approximate mass accumulation rates at DSDP Site 61-462 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.819854, Supplement to: Rea, DK; Thiede, J (1981): Mesozoic and Cenozoic mass-accumulation rates of the major sediment components in the Nauru Basin, western Equatorial Pacific. In: Larson, RL; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 61, 549-555, https://doi.org/10.2973/dsdp.proc.61.111.1981
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Abstract:
A 560-meter-thick sequence of Cenomanian through Pleistocene sediments cored at DSDP Site 462 in the Nauru Basin overlies a 500-meter-thick complex unit of altered basalt flows, diabase sills, and thin intercalated volcaniclastic sediments. The Upper Cretaceous and Cenozoic sediments contain a high proportion of calcareous fossils, although the site has apparently been below the calcite compensation depth (CCD) from the late Mesozoic to the Pleistocene. This fact and the contemporaneous fluctuations of the calcite and opal accumulation rates suggest an irregular influx of displaced pelagic sediments from the shallow margins of the basin to its center, resulting in unusually high overall sedimentation rates for such a deep (5190 m) site. Shallow-water benthic fossils and planktonic foraminifers both occur as reworked materials, but usually are not found in the same intervals of the sediment section. We interpret this as recording separate erosional interludes in the shallow-water and intermediate-water regimes. Lower and upper Cenozoic hiatuses also are believed to have resulted from mid-water events. High accumulation rates of volcanogenic material during Santonian time suggest a corresponding significant volcanic episode. The coincidence of increased carbonate accumulation rates during the Campanian and displacement of shallow-water fossils during the late Campanian-early Maestrichtian with the volcanic event implies that this early event resulted in formation of the island chains around the Nauru Basin, which then served as platforms for initial carbonate deposition.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 7.237500 * Longitude: 165.030500
Date/Time Start: 1978-05-28T00:00:00 * Date/Time End: 1978-05-28T00:00:00
Event(s):
61-462_Site * Latitude: 7.239600 * Longitude: 165.031100 * Date/Time: 1978-05-28T00:00:00 * Elevation: -5179.0 m * Penetration: 16.855 m * Recovery: 7.3 m * Campaign: Leg61 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 160 cores; 1246.9 m cored; 14.5 m drilled; 58.5% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Rea, DK; Thiede, J (1981): (Table 1) Linear sedimentation rates and approximate mass accumulation rates of the bulk sediment at DSDP Site 61-462. https://doi.org/10.1594/PANGAEA.819851
- Rea, DK; Thiede, J (1981): (Table 2) Sediment accumulation rates for DSDP Site 61-462, subdivided into approximate 2-m.y. intervals. https://doi.org/10.1594/PANGAEA.819853