| _version_ | 1867170918590054400 |
|---|---|
| author | Taylor, Rex N Mitchell, John G |
| author_facet | Taylor, Rex N Mitchell, John G |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Results of conventional K-Ar dating on five samples from two sites from the Izu-Bonin forearc are presented. Two samples recovered from a volcanic edifice and overlying sediments drilled on the western side of the forearc basin (Site 792) indicate a basement age of 34 Ma. This is consistent with early Oligocene biostratigraphic ages from the overlying sediments. Three samples from the basement of Hole 793B at the center of the basin are not analytically distinguishable, with a best age of 27.1 +/- 0.6 Ma. This is slightly younger than the 30-33 Ma biostratigraphic and magnetostratigraphic estimates from the overlying sediments, suggesting that alteration processes have lowered the apparent K-Ar ages. These ages suggest that syn-rift volcanism occurred in a forearc location during the middle Oligocene. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_775358 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) K and Ar content, and age determination of ODP Holes 126-792E and 126-793B Taylor, Rex N Mitchell, John G 126-792E; 126-793B; Age, 40K/40Ar Potassium-Argon; Age, dated; Age, dated, standard deviation; Argon; Argon, standard deviation; Contamination; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP; Potassium oxide; Potassium oxide, standard deviation; Sample code/label; Sample comment Results of conventional K-Ar dating on five samples from two sites from the Izu-Bonin forearc are presented. Two samples recovered from a volcanic edifice and overlying sediments drilled on the western side of the forearc basin (Site 792) indicate a basement age of 34 Ma. This is consistent with early Oligocene biostratigraphic ages from the overlying sediments. Three samples from the basement of Hole 793B at the center of the basin are not analytically distinguishable, with a best age of 27.1 +/- 0.6 Ma. This is slightly younger than the 30-33 Ma biostratigraphic and magnetostratigraphic estimates from the overlying sediments, suggesting that alteration processes have lowered the apparent K-Ar ages. These ages suggest that syn-rift volcanism occurred in a forearc location during the middle Oligocene. |
| title | (Table 1) K and Ar content, and age determination of ODP Holes 126-792E and 126-793B |
| topic | 126-792E; 126-793B; Age, 40K/40Ar Potassium-Argon; Age, dated; Age, dated, standard deviation; Argon; Argon, standard deviation; Contamination; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP; Potassium oxide; Potassium oxide, standard deviation; Sample code/label; Sample comment |
| url | https://doi.org/10.1594/PANGAEA.775358 |