Displaced diatom, discoasters and benthic foraminifers at DSDP Hole 72-515A
| Cobertura |
LATITUDE: -26.238500 * LONGITUDE: -36.502800 * DATE/TIME START: 1980-03-01T00:00:00 * DATE/TIME END: 1980-03-01T00:00:00 |
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| Data(s) |
17/05/1983
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| Resumo |
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). |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.811786 doi:10.1594/PANGAEA.811786 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Shor, George; Jones, Glenn A; Rasmussen, Kenneth A; Burckle, Lloyd H (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, doi:10.2973/dsdp.proc.72.144.1983 |
| Palavras-Chave | #72-515A; Additional levels examined for presence (P), absence (A) or trace (tr.), they were not counted; Antarctic; Antarctic; #0 = values based on single specimens are not presented; C. kullenbergi; CaCO3; Calcium carbonate; Cibicidoides kullenbergi; d13C std dev; d18O std dev; Deep Sea Drilling Project; delta 13C, standard deviation; delta 18O, standard deviation; Dentalina sp.; Depth; DEPTH, sediment/rock; Diatom abund; Diatom abundance; Diatoms; Discoaster; DRILL; Drilling/drill rig; DSDP; E. exigua; E. umbonifera; Empty cells indicate that there were too few specimens for isotopic analysis.; Epistominella exigua; Epistominella umbonifera; Fissurina sp.; Foram bent d13C; Foram bent d18O; Foram bent indet; Foraminifera, benthic d13C; Foraminifera, benthic d13C; empty cells indicate that there were too few specimens for isotopic analysis.; Foraminifera, benthic d18O; Foraminifera, benthic d18O; empty cells indicate that there were too few specimens for isotopic analysis.; Foraminifera, benthic indeterminata; Glomar Challenger; Gyroidina sp.; L. nebulosa; Label; Lagena nebulosa; Leg72; M. pompilioides; mbsf; Melonis pompilioides; Number of species; O. tener; ODP sample designation; Oridorsalis tener; P. bulloides; Pullenia bulloides; Pyrgo sp.; Quinqueloculina sp.; Sample code/label; see reference(s); South Atlantic/BASIN; Spec No; U. peregrina; Uvigerina peregrina |
| Tipo |
Dataset |
