McIntosh, W C; McIntosh, Bill (1998): Summary of 40Ar/39Ar results from core sediment CRP-1 (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.54737, Supplement to: McIntosh, W C (1998): 40Ar/39Ar geochronology of volcanic clasts and pumice in CRP-1 core, Cape Roberts, Antarctica. Terra Antartica, 5(3), 683-690, hdl:10013/epic.28322.d001
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Abstract:
40Ar/39Ar dating of volcanic clasts and pumice provide constraints for depositional ages of the CRP-1 core. Laser-fusion analyses of anorthoclase phenocrysts from pumice clasts concentrated near 116 mbsf suggest a depositional age of 18.40 ± 1.12 Ma (± 2). Results from anorthoclase phenocrysts and groundmass concentrates from five clasts of reworked lava provide maximum depositional ages of 19.73 ± 0.86 Ma to 17.15 ± 0.80 Ma for the 61 to 114 mbsf interval of CRP-1. The most precise age determination is 19.32 ± 0.14 Ma for the trachytic clasts near 105 mbsf. Taken together, the 40Ar/39Ar results from the lower part of CRP-1 suggest that none of the sediment above 116 mbsf is older than 19.5 Ma, and the data are most compatible with rapid accumulation of the 61 to 116 mbsf segment of CRP-1 near 18 Ma. 40AR/39Ar results from a basaltic clast from the carbonate-rich layer at 33 mbsf provide a maximum depositional age of 1.2 ± 0.1 Ma for this horizon.
Project(s):
Cape Roberts Project (CRP)
Coverage:
Latitude: -77.007580 * Longitude: 163.755080
Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00
Minimum DEPTH, sediment/rock: 33.23 m * Maximum DEPTH, sediment/rock: 116.98 m
Event(s):
CRP-1 (16 km ENE Cape Roberts) * Latitude: -77.007580 * Longitude: 163.755080 * Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00 * Elevation: -153.5 m * Penetration: 132.06 m * Recovery: 113.32 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-1 * Basis: Sampling/drilling ice * Method/Device: Core wireline system (CWS) * Comment: sea ice thickness: 1.60 m, recovery 86 %. Age and lithology of oldest strata: 22-24 Ma; mudstone with scattered pebbles.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Depth, top/min | Depth top | m | McIntosh, Bill | ||
| 3 | Depth, bottom/max | Depth bot | m | McIntosh, Bill | ||
| 4 | Sample code/label | Sample label | McIntosh, Bill | |||
| 5 | Lithology/composition/facies | Lithology | McIntosh, Bill | Visual description | ||
| 6 | Comment | Comment | McIntosh, Bill | |||
| 7 | Yield | Yield | % | McIntosh, Bill | Age, 40Ar/39Ar Argon-Argon | |
| 8 | Age, dated | Age dated | ka | McIntosh, Bill | Age, 40Ar/39Ar Argon-Argon | method see also parameter sample/comment (ID=1570) |
| 9 | Age, dated standard deviation | Age dated std dev | ± | McIntosh, Bill | Age, 40Ar/39Ar Argon-Argon | method see also parameter sample/comment (ID=1570) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
80 data points
Data
| 1 Depth sed [m] | 2 Depth top [m] | 3 Depth bot [m] | 4 Sample label | 5 Lithology | 6 Comment | 7 Yield [%] | 8 Age dated [ka] | 9 Age dated std dev [±] |
|---|---|---|---|---|---|---|---|---|
| 33.23 | 33.23 | 33.23 | CRP-33-1 | basaltic clast/groundmass, 53 mg | plateau, incremental heating steps: 4 | 24.4 | 1160 | 150 |
| 33.23 | 33.23 | 33.23 | CRP-33-1 | basaltic clast/groundmass, 102 mg | plateau, incremental heating steps: 5 | 19.8 | 1180 | 120 |
| 62.41 | 61.82 | 63.00 | CRP-61-7 | trachyte clast/groundmass, 3.8 mg | plateau, incremental heating steps: 7 | 48.1 | 18120 | 840 |
| 62.41 | 61.82 | 63.00 | CRP-61-8 | trachyte clast/groundmass, 1.9 mg | plateau, incremental heating steps: 6 | 86.8 | 17300 | 950 |
| 90.62 | 90.50 | 90.75 | CRP-90-6 | trachyte clast/groundmass, 6.5 mg | plateau, incremental heating steps: 8 | 91.5 | 17920 | 410 |
| 90.62 | 90.50 | 90.75 | CRP-90-11 | trachyte clast/groundmass, 7.2 mg | plateau, incremental heating steps: 7 | 84.4 | 17150 | 800 |
| 90.62 | 90.50 | 90.75 | CRP-90-3 | trachyte clast/anorthoclase | number of single-crystal laser fusions: 2 | 99.3 | 19320 | 320 |
| 104.88 | 104.88 | 104.89 | CRP-104-1 | trachyte clast/anorthoclase | number of single-crystal laser fusions: 9 | 96.9 | 19320 | 140 |
| 115.32 | 114.94 | 115.70 | CRP-114-22 | trachyte clast/groundmass, 18 mg | near- plateau, incremental heating steps: 12 | 13.3 | 19730 | 860 |
| 116.98 | 116.52 | 117.45 | CRP-116/117 | pumice/anorthoclase | number of single-crystal laser fusions: 3 | 82.8 | 18400 | 1120 |