McDougall, Ian (1994): (Table 1) Age determination of glass-samples from ODP Hole 135-841B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.803544, Supplement to: McDougall, I (1994): Data report: Dating of rhyolitic glass in the Tonga forearc (Hole 841B). In: Hawkins, J; Parson, L; Allan, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 135, 923, https://doi.org/10.2973/odp.proc.sr.135.140.1994
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Abstract:
Several samples from the rhyolitic lavas encountered in Hole 841 B in the Tonga Forearc were made available by A. Ewart for potassiumargon (K-Ar) dating in an attempt to constrain the age of the eruptions.
The material was supplied in crushed form and consisted primarily of volcanic glass together with some microphenocrysts made up mainly of plagioclase and quartz. Plagioclase could not be separated in sufficient amount for dating, especially as the potassium content of the plagioclase was quite low (~0.055% K). Petrographic examination of the volcanic glass indicated that it was remarkably fresh: it was clear, unaltered, and essentially isotopic. Thus, it was decided to attempt to date the volcanic glass.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -23.346000 * Longitude: -175.297000
Date/Time Start: 1991-02-02T15:40:00 * Date/Time End: 1991-02-10T20:30:00
Minimum Elevation: -4821.0 m * Maximum Elevation: -4821.0 m
Event(s):
135-841B * Latitude: -23.346000 * Longitude: -175.297000 * Date/Time Start: 1991-02-02T15:40:00 * Date/Time End: 1991-02-10T20:30:00 * Elevation: -4821.0 m * Penetration: 834.2 m * Recovery: 182.54 m * Location: South Pacific Ocean * Campaign: Leg135 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 70 cores; 664.4 m cored; 0 m drilled; 27.5 % recovery
Comment:
lambda e + lambda e' = 0.581 * 10**-10/a; lamda beta = 4.962 * 10**-10/a; 10K/K = 1.167 * 10**-4 mol/mol
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | McDougall, Ian | DSDP/ODP/IODP sample designation | ||
| 2 | Sample ID | Sample ID | McDougall, Ian | |||
| 3 | Potassium | K | % | McDougall, Ian | #1 | |
| 4 | Potassium | K | % | McDougall, Ian | #2 | |
| 5 | Argon-40 | 40Ar | 10-11 mol/g | McDougall, Ian | ||
| 6 | Argon-40, radiogenic/Argon-40, total | 40Ar*/40Ar(tot) | McDougall, Ian | original in 100 rad. 40Ar/total 40Ar (devided by 100) | ||
| 7 | Age, dated | Age dated | ka | McDougall, Ian | Age, 40K/40Ar Potassium-Argon | |
| 8 | Age, dated standard deviation | Age dated std dev | ± | McDougall, Ian | Age, 40K/40Ar Potassium-Argon |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
32 data points
Data
| 1 Sample label (DSDP/ODP/IODP sample designation) | 2 Sample ID | 3 K [%] (#1) | 4 K [%] (#2) | 5 40Ar [10-11 mol/g] | 6 40Ar*/40Ar(tot) (original in 100 rad. 40Ar/tot...) | 7 Age dated [ka] (Age, 40K/40Ar Potassium-Argon) | 8 Age dated std dev [±] (Age, 40K/40Ar Potassium-Argon) |
|---|---|---|---|---|---|---|---|
| 135-841B-48R-1,5-8 | 92-160 | 1.157 | 1.155 | 9.44 | 0.807 | 46500 | 500 |
| 135-841B-49R-1,10-13 | 91-259 | 1.158 | 1.183 | 9.05 | 0.647 | 44000 | 800 |
| 135-841B-49R-1,15-18 | 92-159 | 1.319 | 1.345 | 9.98 | 0.610 | 42700 | 700 |
| 135-841B-50R-1,5-9 | 92-158 | 1.239 | 1.236 | 9.94 | 0.560 | 43200 | 500 |