Rb-Sr isotope systematics and Sr/Ca-Ba/Ca ratios at DSDP Hole 89-462A
| Cobertura |
LATITUDE: 7.241700 * LONGITUDE: 165.031700 * DATE/TIME START: 1982-11-05T00:00:00 * DATE/TIME END: 1982-11-05T00:00:00 |
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| Data(s) |
01/11/1986
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| Resumo |
Four samples of Nauru Basin basalts (Cores 94 to 109 of Hole 462A, sub-bottom depth 1077-1209 m) have 87Sr/86Sr ratios in the range 0.7037 to 0.7038, which is distinctly higher than the ratios of N-type MORB. The Rb contents of the samples are depleted in comparison with those of MORB and ocean-island basalts. These chemical and isotopic characteristics are identical to those of the basalts previously drilled during Leg 61 (Cores 75 to 90 of Hole 462A), and are explained in terms of inhomogeneity of the source region in the mantle or later alteration effects. Sr/Ca-Ba/Ca systematics of 15 samples from Cores 462A-94 to 462A-109 and 14 samples from Cores 462A-75 to 462A-90 suggest that the Nauru Basin basalts are derived from a mantle peridotite by 20 to 30% partial melting with subsequent Plagioclase crystallization. |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.794478 doi:10.1594/PANGAEA.794478 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Notsu, Kenjii; Onuma, Naoki; Fujii, Naoyuki (1986): Rb-Sr isotope systematics and Sr/Ca-Ba/Ca ratios of Nauru Basin Basalts, Deep Sea Drilling Project Leg 89. In: Moberly, R; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 89, 523-527, doi:10.2973/dsdp.proc.89.120.1986 |
| Palavras-Chave | #2sigma; 2sigma mean error of each analysis is less than 0.00002, but the reproducibility of the same sample is less than 0.00005. So the uncertainty associated with each ratio is estimated to be ±0.00005.; 2sigma mean errors are less than 2%; 8/Rb/86Sr std dev; 87Rb/86Sr; 87Sr/86Sr; 89-462A; Ba; Ba/Ca; Barium; Barium/Calcium ratio; Ca; Calcium; Coupled plasma emission spectrophotometry; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Label; Leg89; North Pacific; ODP sample designation; Rb; Rb std dev; Rubidium; Rubidium, standard deviation; Rubidium 87/Strontium 86, standard deviation; Rubidium 87/Strontium 86 ratio; Samp com; Sample code/label; Sample comment; see reference(s); Sr; Sr/Ca; Strontium; Strontium/Calcium ratio; Strontium 87/Strontium 86 ratio |
| Tipo |
Dataset |
