Table 2. 40Ar-39Ar plateau and isochron age calculations, Site 1001.
|
Core,
section |
Material
|
Plateau age
by 1/  2(Ma) |
39Ar
(% of total) |
Isochron age
(Ma) |
N
|
40Ar-36Ar
intercept ± 1
|
|---|---|---|---|---|---|---|
| 165-1001A- | ||||||
| 54R-7 | Basalt | 81.3 ± 5.4 | 85 | 81.7 ± 6.2 | 6 | 293.7 ± 5.7 |
| 53R-3 | Basalt | 80.8 ± 1.3 | 50 | 80.2 ± 2.5 | 5 | 300.1 ± 5.6 |
| 56R-3 | Basalt | 81.0 ± 1.2 | 55 | 85.3 ± 5.6 | 4 | 290.8 ± 32.7 |
Notes: Section
165-1001A-54R-7 was analyzed using the AEI MS-10S and Sections 165-1001A-53R-3
and 165-1001A-56R-3 were analyzed using the MAP 215-50. Errors for both step age
plateaus and isochrons are reported to 2 .
Ages are corrected for 37Ar
decay, half-life = 35.1 days. 
= 0.581 × 10-10yr-1;
ß
= 4.962 × 10-10
yr-1. N
= the number of steps used in the isochron calculation.