Taylor, Rex N; Mitchell, John G (1992): (Table 1) K and Ar content, and age determination of ODP Holes 126-792E and 126-793B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.775358, Supplement to: Taylor, RN; Mitchell, JG (1992): K-Ar dating results from whole-rock and mineral separates of the Izu-Bonin Forearc basement, Leg 126. In: Taylor, B; Fujioka, K; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 677-680, https://doi.org/10.2973/odp.proc.sr.126.168.1992
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Abstract:
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.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.752655 * Median Longitude: 140.633700 * South-bound Latitude: 31.105910 * West-bound Longitude: 140.379300 * North-bound Latitude: 32.399400 * East-bound Longitude: 140.888100
Date/Time Start: 1989-05-19T04:55:00 * Date/Time End: 1989-06-17T18:55:00
Minimum Elevation: -2975.0 m * Maximum Elevation: -1798.0 m
Event(s):
126-792E * Latitude: 32.399400 * Longitude: 140.379300 * Date/Time Start: 1989-05-19T04:55:00 * Date/Time End: 1989-05-26T06:40:00 * Elevation: -1798.0 m * Penetration: 885.9 m * Recovery: 362.07 m * Location: North Pacific Ocean * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 78 cores; 750.3 m cored; 0 m drilled; 48.3 % recovery
126-793B * Latitude: 31.105910 * Longitude: 140.888100 * Date/Time Start: 1989-05-27T18:10:00 * Date/Time End: 1989-06-17T18:55:00 * Elevation: -2975.0 m * Penetration: 1682 m * Recovery: 697.94 m * Location: North Pacific Ocean * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 114 cores; 1095.5 m cored; 0 m drilled; 63.7 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Taylor, Rex N | DSDP/ODP/IODP sample designation | ||
| 3 | Sample comment | Sample comment | Taylor, Rex N | |||
| 4 | Potassium oxide | K2O | % | Taylor, Rex N | ||
| 5 | Potassium oxide, standard deviation | K2O std dev | ± | Taylor, Rex N | ||
| 6 | Argon | Ar | cm3/kg | Taylor, Rex N | ||
| 7 | Argon, standard deviation | Ar std dev | ± | Taylor, Rex N | ||
| 8 | Contamination | Contamination | % | Taylor, Rex N | atmospheric | |
| 9 | Age, dated | Age dated | ka | Taylor, Rex N | Age, 40K/40Ar Potassium-Argon | |
| 10 | Age, dated standard deviation | Age dated std dev | ± | Taylor, Rex N | Age, 40K/40Ar Potassium-Argon |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
45 data points
Data
| 1 Event | 2 Sample label | 3 Sample comment | 4 K2O [%] | 5 K2O std dev [±] | 6 Ar [cm3/kg] | 7 Ar std dev [±] | 8 Contamination [%] | 9 Age dated [ka] | 10 Age dated std dev [±] |
|---|---|---|---|---|---|---|---|---|---|
| 126-792E | 126-792E-69R-1 | Amphibole | 0.056 | 0.002 | 6.88 | 0.35 | 91.1 | 37700 | 2300 |
| 126-792E | 126-792E-71R-3 | Whole rock | 0.240 | 0.004 | 26.00 | 0.80 | 81.1 | 33300 | 1200 |
| 126-793B | 126-793B-96R-1 | Whole rock | 0.276 | 0.005 | 23.60 | 0.09 | 78.0 | 26300 | 1100 |
| 126-793B | 126-793B-97R-1 | Whole rock | 0.195 | 0.002 | 18.10 | 0.06 | 81.5 | 28500 | 1000 |
| 126-793B | 126-793B-112R-2 | Whole rock | 0.329 | 0.005 | 28.30 | 0.09 | 76.4 | 26500 | 900 |