Shor, George; Jones, Glenn A; Rasmussen, Kenneth A; Burckle, Lloyd H (1983): Displaced diatom, discoasters and benthic foraminifers at DSDP Hole 72-515A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.811786, Supplement to: Shor, G et al. (1983): Carbonate spikes and displaced components at Deep Sea Drilling Project Site 515: Pliocene/Pleistocene depositional processes in the southern Brazil Basin. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 885-893, https://doi.org/10.2973/dsdp.proc.72.144.1983
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Abstract:
Late Pliocene to Recent sediments from the southern Brazil Basin (DSDP Hole 515A, hydraulic piston core) were analyzed for evidence of episodic flow of Antarctic Bottom Water (AABW) through the Vema Channel. Carbonate-enriched layers punctuate the post-Pliocene section, otherwise composed predominantly of terrigenous silt and clay. Carbonate enrichment is thought to result from rapid deposition of fine-grained calcareous turbidites, originating in canyons incised on the northern margin of the Rio Grande Rise. The composition of benthic foraminiferal assemblages and the presence of stratigraphically displaced discoasters is consistent with a turbidite origin. Based on the presence of displaced Antarctic diatoms, AABW flow through the Vema Channel apparently has had a major influence on this site for only four periods during the last 2.7 Ma (about 45 to 250; 375 to 430; 700 to 780; 1320 to 1345 thousand yr. ago).
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -26.238500 * Longitude: -36.502800
Date/Time Start: 1980-03-01T00:00:00 * Date/Time End: 1980-03-01T00:00:00
Event(s):
72-515A * Latitude: -26.238500 * Longitude: -36.502800 * Date/Time: 1980-03-01T00:00:00 * Elevation: -4252.0 m * Penetration: 107.9 m * Recovery: 95.7 m * Location: South Atlantic/BASIN * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 99.5 m cored; 8.4 m drilled; 96.2 % 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
- Shor, G; Jones, GA; Rasmussen, KA et al. (1983): (Table 1) Displaced diatom and discoasters at DSDP Hole 72-515A. https://doi.org/10.1594/PANGAEA.811784
- Shor, G; Jones, GA; Rasmussen, KA et al. (1983): (Table 2) Benthic foraminifers at DSDP Hole 72-515A. https://doi.org/10.1594/PANGAEA.811785