Planktonic foraminifer abundance and estimated sea surface temperatures and salinities of DSDP Leg 74 holes
Cobertura |
MEDIAN LATITUDE: -28.795000 * MEDIAN LONGITUDE: 2.650750 * SOUTH-BOUND LATITUDE: -29.070700 * WEST-BOUND LONGITUDE: 2.316200 * NORTH-BOUND LATITUDE: -28.519300 * EAST-BOUND LONGITUDE: 2.985300 * DATE/TIME START: 1980-06-10T00:00:00 * DATE/TIME END: 1980-07-04T00:00:00 |
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Data(s) |
25/06/1988
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Resumo |
Two hydraulic piston cores containing the total Quaternary suite were analyzed quantitatively in their planktonic foraminiferal contents. For the Early Pleistocene, the Caribbean standard zonation (BOLLI & PREMOLI-SILVA) can be adopted and refined by the introduction of an additional subzone at its base (the Globorotalia triangula subzone). Local substages are proposed for the Late Pleistocene because index fossils are missing. The use of the transfer-function technique resulted in paleotemperature and paleosalinity curves with a time resolution of cycles of about 4-68,000 years duration. The Early Pleistocene paleoenvironment is characterized by low oscillations of the surface water temperatures, followed by a distinct cooling trend during the Globorotalia viola subzone, a period of smoothed cycles during the Globorotalia hessi subzone and distinctly developed cycles during the late Pleistocene since the oxygen isotope termination III. Grainsize distribution and several dissolution indices gave evidence for current activities on the top of the Walvis Ridge, where the amount of fine grained components in the sediment is reduced in comparison with that of the flanks. |
Formato |
application/zip, 3 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.784990 doi:10.1594/PANGAEA.784990 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Pflaumann, Uwe (1988): Stratigraphy and paleoecology of the Quaternary in the eastern South Atlantic. The record by planktonic foraminifera from sediments of the central Walvis Ridge, DSDP Leg 74. Meyniana, 40, 71-117, doi:10.2312/meyniana.1988.40.71 |
Palavras-Chave | #74-525B; 74-528A; all samples; Commun; Communality; Deep Sea Drilling Project; Depth; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Event; Foraminifera, planktic; Foram plankt; given in per mil; Glomar Challenger; Label; Leg74; max abundance (all samples); mbsf; mean abundance (all samples); mean abundance (sample subset = only where present); min abundance (all samples); min abundance (sample subset = only where present); No; N subset; Number; N where species was present (N total = 115 for Hole 74-525B and =148 for 74-528A); ODP sample designation; Sample amount, subset; Sample code/label; sample subset; Sea surface salinity; Sea surface temperature, summer; Sea surface temperature, winter; South Atlantic/CREST; South Atlantic/RIDGE; Species; SSS; SST sum; SST win; Standard deviation; Std dev; Transfer function (Imbrie & Kipp, 1971, in Turekian, Yale Univ Press) |
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Dataset |