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Table T7. Concentrations of isotopes expressed as masses, Expedition 325. (See table notes.)
Core, section,
interval (cm)
|
238U (ppm)
|
2σ
|
232Th (ppb)
|
2σ
|
(232Th/238U)
|
2σ
|
(230Th/238U)
|
2σ
|
(234U/238U)
|
2σ
|
|
325-
|
|
M0031A-16R-1, 0–3
|
3.106
|
0.011
|
0.20
|
0.00
|
0.0000208
|
0.0000005
|
0.2341
|
0.0020
|
1.1316
|
0.0007
|
|
M0032A-8R-3, 0–2
|
0.894
|
0.003
|
13.56
|
0.23
|
0.0049670
|
0.0000860
|
0.1944
|
0.0021
|
1.1332
|
0.0007
|
|
M0032A-18R-2, 8–10
|
2.241
|
0.008
|
0.99
|
0.02
|
0.0001448
|
0.0000026
|
0.4854
|
0.0048
|
1.1213
|
0.0007
|
|
M0033A-15R-2, 5–7
|
1.381
|
0.005
|
110.40
|
1.90
|
0.0261600
|
0.0004500
|
0.2815
|
0.0025
|
1.1294
|
0.0007
|
|
M0034A-13R-2, 6–8
|
2.734
|
0.009
|
0.17
|
0.00
|
0.0000208
|
0.0000005
|
0.1120
|
0.0011
|
1.1425
|
0.0007
|
|
M0035A-20R-2, 0–2
|
2.719
|
0.009
|
0.30
|
0.01
|
0.0000362
|
0.0000007
|
0.2024
|
0.0017
|
1.1335
|
0.0008
|
|
M0036A-18R-2, 8–10
|
3.939
|
0.014
|
10.39
|
0.17
|
0.0008640
|
0.0000140
|
0.1981
|
0.0017
|
1.1342
|
0.0007
|
|
M0037A-7R-2, 2–4
|
1.757
|
0.006
|
7.44
|
0.13
|
0.0013860
|
0.0000240
|
0.1241
|
0.0010
|
1.1362
|
0.0007
|
|
M0039A-16R-2, 8–10
|
4.007
|
0.014
|
7.22
|
0.12
|
0.0005900
|
0.0000100
|
0.1810
|
0.0014
|
1.1364
|
0.0007
|
|
M0040A-8R-2, 5–8
|
3.717
|
0.013
|
7.45
|
0.13
|
0.0006560
|
0.0000110
|
0.2304
|
0.0018
|
1.1300
|
0.0007
|
|
M0042A-24R-2, 8–9
|
1.344
|
0.005
|
2.87
|
0.05
|
0.0006990
|
0.0000120
|
0.8780
|
0.0100
|
1.0950
|
0.0007
|
|
M0043A-18R-2, 2–4
|
4.290
|
0.015
|
2.81
|
0.05
|
0.0002148
|
0.0000037
|
0.1934
|
0.0017
|
1.1340
|
0.0008
|
|
M0046A-11R-1, 10–11
|
4.088
|
0.014
|
1.55
|
0.03
|
0.0001243
|
0.0000022
|
0.1668
|
0.0015
|
1.1378
|
0.0007
|
|
M0047A-11R-2, 5–6
|
4.232
|
0.015
|
0.96
|
0.02
|
0.0000740
|
0.0000013
|
0.1978
|
0.0016
|
1.1348
|
0.0007
|
|
M0049B-9R-2, 4–5
|
3.356
|
0.012
|
6.83
|
0.12
|
0.0006670
|
0.0000120
|
0.1520
|
0.0014
|
1.1449
|
0.0007
|
|
M0053A-25R-2, 2–3
|
4.533
|
0.016
|
6.68
|
0.12
|
0.0004821
|
0.0000087
|
0.2217
|
0.0020
|
1.1315
|
0.0007
|
|
M0054B-4R-2, 2–3
|
3.682
|
0.013
|
2.71
|
0.05
|
0.0002414
|
0.0000043
|
0.1919
|
0.0015
|
1.1355
|
0.0008
|
|
M0055A-5R-3, 0–1
|
2.678
|
0.009
|
12.80
|
0.22
|
0.0015650
|
0.0000270
|
0.2332
|
0.0020
|
1.1307
|
0.0007
|
|
M0056A-13R-2, 2–3
|
1.674
|
0.006
|
26.90
|
0.50
|
0.0052610
|
0.0000930
|
0.6007
|
0.0051
|
1.1062
|
0.0007
|
|
M0057A-15R-3, 9–10
|
1.074
|
0.004
|
1.95
|
0.04
|
0.0005950
|
0.0000110
|
1.1730
|
0.0130
|
1.0868
|
0.0007
|
Notes: Uncertainties of concentrations include all weighing errors; isotope ratios are independent of weighing uncertainties. All isotope ratios are expressed as activities and are calculated using the decay constants of Cheng et al. (2000), Holden (1990), and Jaffey et al. (1971).
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