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McIntosh, W C; McIntosh, Bill (1998): Summary of 40Ar/39Ar results from core sediment CRP-1 (Table 1). PANGAEA,, 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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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.
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
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 * 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.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Depth, top/minDepth topmMcIntosh, Bill
3Depth, bottom/maxDepth botmMcIntosh, Bill
4Sample code/labelSample labelMcIntosh, Bill
5Lithology/composition/faciesLithologyMcIntosh, BillVisual description
6CommentCommentMcIntosh, Bill
7YieldYield%McIntosh, BillAge, 40Ar/39Ar Argon-Argon
8Age, datedAge datedkaMcIntosh, BillAge, 40Ar/39Ar Argon-Argonmethod see also parameter sample/comment (ID=1570)
9Age, dated standard deviationAge dated std dev±McIntosh, BillAge, 40Ar/39Ar Argon-Argonmethod see also parameter sample/comment (ID=1570)
80 data points

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