40Ar-39Ar geochronological studies on rocks at DSDP Leg 58 Holes
| Cobertura |
MEDIAN LATITUDE: 26.313682 * MEDIAN LONGITUDE: 134.317847 * SOUTH-BOUND LATITUDE: 24.700700 * WEST-BOUND LONGITUDE: 132.774800 * NORTH-BOUND LATITUDE: 29.327500 * EAST-BOUND LONGITUDE: 137.440500 * DATE/TIME START: 1977-12-28T00:00:00 * DATE/TIME END: 1978-01-18T00:00:00 |
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| Data(s) |
31/10/1980
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| Resumo |
The technique of 40Ar-39Ar step-heating dating was applied to three rock samples from core of DSDP Site 443, one sample from Site 445, and four samples at Site 446. All sites were drilled during DSDP Leg 58. At Site 443 (Shikoku Basin), about 116 meters of basalt basement was drilled. Three samples were chosen for dating from different levels in the basalt; two samples are aphyric basalt, and the other is subophitic dolerite. At Site 445 (Daito Ridge), no basement rock was drilled; however, conglomeratic sandstone was cored in the lower part of the hole. 40Ar-39Ar dating was applied to a basalt pebble in the conglomerate. At Site 446 (Daito Basin), the lower cored sequence is clay stone interlayered with 16 basalt sills. Four samples were chosen from sills at different levels. |
| Formato |
application/zip, 3 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.821516 doi:10.1594/PANGAEA.821516 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Ozima, Minoru; Takigami, Yutaka; Kaneoka, Ichiro (1980): 40Ar-39Ar geochronological studies on rocks of Deep Sea Drilling Project Sites 443, 445, and 446. In: deVries Klein, G; Kobayashi, K; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 58, 917-920, doi:10.2973/dsdp.proc.58.139.1980 |
| Palavras-Chave | #-; 37Ar/36Ar; 37Ar/36Ar e rel; 39Ar; 39Ar/36Ar; 39Ar/36Ar e rel; 40Ar/36Ar; 40Ar/36Ar e rel; 58-443; 58-445; 58-446A; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Age dated; Age std dev; Apparent; Apparent, 1 sigma; Argon-37/Argon-36; Argon-37/Argon-36, error, relative; Argon-39; Argon-39/Argon-36; Argon-39/Argon-36, error, relative; Argon-40/Argon-36; Argon-40/Argon-36, error, relative; Calculated; Clinopyroxene; Comm 2; Comment; Comment 2 (continued); Cpx; Cutoff values for the 95% significance level; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Event; Fractions used for isochron; Glasses; Glomar Challenger; Groundmass; Ilm; Ilmenite; Intercept; Isochron; J = [exp(lambda-ts)-1]/(40Ar/39Ar)s:ts = age of a standard sample; s = standard sample; lambda = total decay constant of 40K.; Label; Leg58; MSUM = SUMS/(n - 2); n = number of fractions (Brooks et al., 1972);; No; North Pacific/BASIN; North Pacific/Philippine Sea/BASIN; Number; ODP sample designation; Ol; Olivine; Phenocryst; Pl; Plagioclase; r; Rock; Rock type; Sample code/label; see reference(s); Sum; Temperature, technical; Texture; Timag; Titanomagnetite; Total Fusion; T tech |
| Tipo |
Dataset |
