10.1594/PANGAEA.54737
McIntosh, W C
W C
McIntosh
McIntosh, Bill
Bill
McIntosh
Summary of 40Ar/39Ar results from core sediment CRP-1 (Table 1)
PANGAEA
1998
DEPTH, sediment/rock
Depth, top/min
Depth, bottom/max
Sample code/label
Lithology/composition/facies
Comment
Yield
Age, dated
Age, dated standard deviation
Core wireline system
Visual description
Age, 40Ar/39Ar Argon-Argon
CRP-1
Sampling/drilling ice
Cape Roberts Project (CRP)
1997-10-17T01:30:00/1997-10-24T02:00:00
en
Supplementary Dataset
10013/epic.28322.d001
80 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
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.
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
163.75508
-77.00758
off Cape Roberts, Ross Sea, Antarctica