Strontium isotopic data for calcareous ooze, chalk, and pore waters from DSDP Hole 590B
Cobertura |
MEDIAN LATITUDE: -29.903750 * MEDIAN LONGITUDE: 121.236450 * SOUTH-BOUND LATITUDE: -31.167000 * WEST-BOUND LONGITUDE: -5.129700 * NORTH-BOUND LATITUDE: -26.114000 * EAST-BOUND LONGITUDE: 163.358500 * DATE/TIME START: 1980-05-06T00:00:00 * DATE/TIME END: 1982-12-15T00:00:00 |
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Data(s) |
26/01/2009
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Resumo |
A detailed study of strontium isotope variations in Neogene marine carbonate sediments from Deep Sea Drilling Project Site 590B, using techniques that allow the 87Sr/86Sr ratio to be determined to better than +/-0.00001, gives a high-resolution record of the Sr isotopic evolution of seawater. The data show that the rate of change of the marine 87Sr/86Sr ratio has varied significantly even on time scales as short as 1 m.y. Periods of particularly rapid growth appear to follow major marine regressions and probably reflect an increase in the delivery of radiogenic Sr from the continents coupled with a decreased submarine carbonate dissolution rate (greater carbonate compensation depth). Periods of relatively slowly changing 87Sr/86Sr follow major marine transgressions. On the basis of correlations with the marine oxygen isotope record and the times of major continental glacier growth, it is inferred that the effects of sea-level variations are modified by climatic factors that affect the intensity of continental weathering and runoff. The effects of sea-floor generation rate variations are not discernible for the Neogene. The maximum attainable stratigraphic resolution using Sr isotopes is between 0.1 and 2 m.y. for this time period. |
Formato |
application/zip, 2 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.711800 doi:10.1594/PANGAEA.711800 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
DePaolo, Donald J (1986): Detailed record of the Neogene Sr isotopic evolution of seawater from DSDP Site 590B. Geology, 14(2), 103-106, doi:10.1130/0091-7613(1986)14<103:DROTNS>2.0.CO;2 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Palavras-Chave | #73-522; 87Sr/86Sr; 87Sr/86Sr e; 90-590B; Age; AGE; Calculated; calculated average/mean values; Deep Sea Drilling Project; Depth; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Event; Glomar Challenger; Isotope ratio mass spectrometry; Label; Leg73; Leg90; Nannofossil zone; Nannos zone; ODP sample designation; R1; R2; R3; Samp com; Sample code/label; Sample comment; South Atlantic/PLATEAU; South Pacific/Tasman Sea/CONT RISE; Sr; Sr content of distilled water rinse of wet sediment as a fraction of the Sr contained in the solid fraction; Strontium; Strontium 87/Strontium 86, error; Strontium 87/Strontium 86 ratio |
Tipo |
Dataset |