La Jolla Bay
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|
step
|
P (W)
|
t (min)
|
40Ar/39Ar
|
38Ar/39Ar
|
37Ar/39Ar
|
36Ar/39Ar
|
39Ar (mol)
|
%40Ar*
|
40Ar*/39ArK
|
Age (Ma)
+ sAge
(an)
|
Cl/K
|
Ca/K
|
|
1
|
4
|
1
|
9.523
|
0.018
|
6.02E-03
|
7.80E-04
|
2.69E-14
|
96.9
|
9.256
|
92.0±0.3
|
1.33E-03
|
0.012
|
|
2
|
4
|
1
|
9.066
|
0.015
|
7.33E-03
|
1.60E-03
|
6.84E-14
|
94.0
|
8.556
|
85.2±0.5
|
4.99E-04
|
0.015
|
|
3
|
4
|
1
|
8.916
|
0.014
|
7.80E-03
|
2.90E-04
|
2.77E-14
|
98.3
|
8.793
|
87.5±0.3
|
2.98E-04
|
0.016
|
|
4
|
4
|
1
|
10.29
|
0.029
|
2.73E-02
|
6.73E-03
|
1.26E-14
|
79.8
|
8.262
|
82.3±0.6
|
4.07E-03
|
0.055
|
|
5
|
4
|
1
|
9.049
|
0.015
|
3.23E-03
|
4.40E-04
|
8.33E-14
|
97.8
|
8.883
|
88.3±0.3
|
5.65E-04
|
0.007
|
|
6
|
4
|
1
|
10.21
|
0.019
|
3.06E-02
|
1.99E-03
|
3.21E-14
|
93.5
|
9.584
|
95.1±0.4
|
1.49E-03
|
0.062
|
|
7
|
4
|
1
|
8.669
|
0.017
|
7.98E-03
|
5.80E-04
|
6.20E-14
|
97.3
|
8.461
|
84.2±0.3
|
9.49E-04
|
0.016
|
|
8
|
4
|
1
|
9.211
|
0.009
|
5.13E-03
|
-4.27E-05
|
5.60E-14
|
99.5
|
9.187
|
91.3±0.3
|
-1.11E-03
|
0.010
|
|
9
|
4
|
1
|
9.185
|
0.016
|
7.51E-03
|
4.95E-04
|
2.28E-14
|
97.7
|
9.002
|
89.5±0.3
|
7.08E-04
|
0.015
|
|
10
|
4
|
1
|
9.022
|
0.016
|
7.09E-03
|
4.72E-04
|
1.90E-14
|
97.6
|
8.846
|
88.0±0.4
|
7.08E-04
|
0.014
|
|
11
|
4
|
1
|
10.40
|
0.018
|
2.06E-01
|
1.26E-03
|
4.83E-14
|
96.0
|
10.01
|
99.3±0.4
|
1.19E-03
|
0.415
|
|
12
|
4
|
1
|
9.388
|
0.015
|
1.05E-01
|
3.08E-04
|
3.77E-14
|
98.4
|
9.270
|
92.1±0.2
|
4.94E-04
|
0.212
|
|
13
|
4
|
1
|
7.930
|
0.015
|
9.95E-03
|
6.21E-04
|
3.79E-14
|
97.0
|
7.710
|
76.9±0.2
|
3.59E-04
|
0.020
|
|
14
|
4
|
1
|
10.91
|
0.039
|
2.14E-02
|
2.58E-03
|
8.68E-14
|
92.2
|
10.11
|
100.2±0.5
|
7.11E-03
|
0.043
|
|
15
|
4
|
1
|
10.34
|
0.028
|
7.68E-03
|
3.74E-04
|
3.77E-14
|
98.3
|
10.19
|
101.0±0.3
|
3.99E-03
|
0.016
|
|
16
|
4
|
1
|
9.372
|
0.019
|
7.86E-02
|
9.98E-04
|
2.50E-14
|
96.2
|
9.048
|
89.9±0.3
|
1.68E-03
|
0.159
|
|
17
|
4
|
1
|
8.869
|
0.015
|
5.95E-03
|
2.82E-04
|
5.15E-14
|
98.4
|
8.749
|
87.0±0.2
|
3.82E-04
|
0.012
|
|
18
|
4
|
1
|
24.58
|
0.049
|
3.85E-02
|
5.40E-02
|
1.11E-14
|
34.9
|
8.596
|
85.6±1.6
|
7.16E-03
|
0.078
|
|
19
|
4
|
1
|
9.444
|
0.021
|
1.42E-02
|
1.19E-03
|
6.69E-14
|
95.5
|
9.057
|
90.0±0.3
|
2.01E-03
|
0.029
|
|
20
|
4
|
1
|
9.251
|
0.023
|
2.29E-03
|
2.91E-03
|
3.77E-14
|
90.0
|
8.354
|
83.2±0.3
|
2.58E-03
|
0.005
|
|
21
|
4
|
1
|
10.11
|
0.019
|
1.51E-02
|
1.53E-03
|
1.04E-13
|
94.9
|
9.618
|
95.5±0.3
|
1.59E-03
|
0.031
|
|
22
|
4
|
1
|
10.29
|
0.019
|
7.48E-03
|
4.00E-03
|
2.23E-14
|
87.9
|
9.071
|
90.2±0.4
|
1.36E-03
|
0.015
|
|
23
|
4
|
1
|
9.516
|
0.024
|
4.55E-03
|
2.01E-03
|
3.99E-14
|
93.1
|
8.886
|
88.4±0.4
|
2.83E-03
|
0.009
|
|
24
|
4
|
1
|
9.338
|
0.021
|
7.92E-03
|
1.03E-03
|
4.63E-14
|
96.1
|
8.996
|
89.4±0.3
|
1.99E-03
|
0.016
|
|
25
|
4
|
1
|
11.20
|
0.035
|
1.58E+00
|
9.53E-03
|
5.63E-15
|
74.9
|
8.500
|
84.6±1.4
|
5.61E-03
|
3.200
|
|
26
|
4
|
1
|
9.176
|
0.022
|
2.37E-01
|
2.30E-03
|
4.39E-14
|
92.1
|
8.482
|
84.4±0.3
|
2.24E-03
|
0.479
|
|
27
|
4
|
1
|
9.491
|
0.025
|
4.43E-02
|
8.35E-04
|
5.27E-14
|
96.8
|
9.212
|
91.5±0.2
|
3.17E-03
|
0.090
|
|
28
|
4
|
1
|
10.51
|
0.034
|
6.28E-02
|
1.66E-03
|
3.33E-14
|
94.7
|
9.985
|
99.0±0.3
|
5.67E-03
|
0.127
|
|
29
|
4
|
1
|
10.44
|
0.084
|
4.36E-02
|
1.71E-03
|
1.97E-14
|
94.5
|
9.905
|
98.2±0.4
|
1.97E-02
|
0.088
|
|
30
|
4
|
1
|
8.904
|
0.015
|
2.24E-02
|
4.22E-04
|
2.51E-14
|
97.7
|
8.744
|
87.0±0.4
|
5.30E-04
|
0.045
|
|
31
|
4
|
1
|
9.625
|
0.015
|
1.21E-01
|
5.04E-04
|
2.19E-14
|
97.8
|
9.450
|
93.8±0.3
|
4.81E-04
|
0.244
|
|
32
|
4
|
1
|
9.421
|
0.014
|
8.46E-02
|
3.63E-04
|
1.54E-14
|
98.0
|
9.284
|
92.2±0.4
|
1.59E-04
|
0.171
|
|
33
|
4
|
7
|
8.235
|
0.014
|
1.71E-04
|
3.68E-04
|
5.03E-14
|
98.0
|
8.089
|
81.3±0.3
|
3.29E-04
|
0.000
|
|
34
|
4
|
7
|
10.89
|
0.034
|
-1.63E-03
|
5.81E-04
|
4.80E-14
|
97.9
|
10.68
|
106.5±0.3
|
5.65E-03
|
-0.003
|
|
35
|
4
|
7
|
9.756
|
0.019
|
-1.24E-02
|
2.59E-05
|
3.75E-14
|
99.2
|
9.710
|
97.1±0.4
|
1.54E-03
|
-0.025
|
|
36
|
4
|
7
|
9.308
|
0.017
|
5.38E-03
|
1.85E-03
|
2.64E-14
|
93.3
|
8.725
|
87.5±0.6
|
1.09E-03
|
0.011
|
|
37
|
4
|
7
|
9.275
|
0.017
|
-1.24E-06
|
5.49E-04
|
5.19E-14
|
97.6
|
9.075
|
90.9±0.4
|
1.10E-03
|
0.000
|
|
38
|
4
|
7
|
9.564
|
0.014
|
-2.19E-03
|
3.70E-05
|
4.77E-14
|
99.2
|
9.515
|
95.2±0.3
|
1.09E-04
|
-0.004
|
|
39
|
4
|
7
|
8.900
|
0.014
|
5.33E-04
|
1.46E-04
|
4.55E-14
|
98.8
|
8.820
|
88.4v0.4
|
3.02E-04
|
0.001
|
|
40
|
4
|
7
|
8.433
|
0.013
|
-8.86E-03
|
3.24E-04
|
2.88E-14
|
98.0
|
8.300
|
83.3±0.5
|
1.09E-05
|
-0.018
|
|
41
|
4
|
7
|
8.755
|
0.016
|
2.80E-02
|
7.68E-04
|
2.08E-14
|
96.4
|
8.494
|
85.2±0.8
|
7.10E-04
|
0.057
|
|
42
|
4
|
7
|
10.39
|
0.057
|
1.72E-01
|
9.87E-04
|
2.73E-14
|
96.6
|
10.08
|
100.7±0.6
|
1.22E-02
|
0.348
|
|
43
|
4
|
7
|
10.30
|
0.014
|
1.13E-03
|
3.17E-04
|
3.38E-14
|
98.4
|
10.17
|
101.6±0.4
|
2.57E-04
|
0.002
|
|
44
|
4
|
7
|
10.07
|
0.014
|
6.56E-03
|
3.06E-04
|
4.36E-14
|
98.5
|
9.942
|
99.4±0.3
|
1.90E-04
|
0.013
|
|
45
|
4
|
7
|
9.565
|
0.014
|
9.95E-03
|
6.43E-04
|
5.38E-14
|
97.4
|
9.338
|
93.5±0.4
|
9.44E-05
|
0.020
|
|
46
|
4
|
7
|
8.728
|
0.013
|
-2.48E-03
|
1.61E-04
|
4.80E-14
|
98.8
|
8.643
|
86.7±0.3
|
6.10E-05
|
-0.005
|
|
47
|
4
|
7
|
11.88
|
0.051
|
3.46E+00
|
1.29E-02
|
5.19E-15
|
69.0
|
8.365
|
84.0±2.6
|
9.75E-03
|
7.010
|
|
48
|
4
|
7
|
9.128
|
0.017
|
-1.10E-03
|
1.63E-04
|
2.02E-14
|
98.5
|
9.042
|
90.6±0.7
|
9.08E-04
|
-0.002
|
|
49
|
4
|
7
|
9.269
|
0.017
|
1.15E-02
|
1.23E-04
|
4.28E-14
|
98.9
|
9.197
|
92.1±0.4
|
9.11E-04
|
0.023
|
|
50
|
4
|
7
|
8.781
|
0.015
|
-1.74E-03
|
1.85E-04
|
4.79E-14
|
98.7
|
8.689
|
87.1±0.3
|
6.04E-04
|
-0.004
|
|
51
|
4
|
7
|
9.502
|
0.021
|
4.98E-03
|
1.40E-03
|
3.54E-14
|
94.9
|
9.050
|
90.7±0.4
|
1.95E-03
|
0.010
|
|
52
|
4
|
7
|
9.355
|
0.014
|
6.71E-03
|
8.23E-05
|
3.72E-14
|
99.0
|
9.294
|
93.0±0.4
|
1.90E-04
|
0.014
|
|
53
|
4
|
7
|
8.305
|
0.015
|
-1.01E-02
|
4.49E-04
|
3.92E-14
|
97.6
|
8.135
|
81.7±0.4
|
5.51E-04
|
-0.020
|
|
54
|
4
|
7
|
12.46
|
0.068
|
2.11E+00
|
7.81E-03
|
1.07E-14
|
82.0
|
10.33
|
103.1±1.3
|
1.47E-02
|
4.265
|
|
55
|
4
|
15
|
10.83
|
0.061
|
7.76E-03
|
1.36E-03
|
5.32E-14
|
95.7
|
10.39
|
103.7±0.3
|
1.32E-02
|
0.016
|
|
56
|
4
|
7
|
10.83
|
0.025
|
1.43E-01
|
5.34E-03
|
1.56E-14
|
84.6
|
9.226
|
92.4±0.9
|
3.06E-03
|
0.290
|
|
57
|
4
|
7
|
8.979
|
0.016
|
-4.02E-03
|
1.41E-03
|
2.65E-14
|
94.5
|
8.524
|
85.5±0.5
|
7.00E-04
|
-0.008
|
|
58
|
4
|
7
|
10.49
|
0.035
|
1.65E+00
|
7.13E-03
|
7.96E-15
|
79.9
|
8.506
|
85.3±1.7
|
5.69E-03
|
3.342
|
|
59
|
4
|
7
|
8.690
|
0.014
|
1.84E-03
|
4.68E-04
|
3.34E-14
|
97.6
|
8.515
|
85.4±0.8
|
2.16E-04
|
0.004
|
|
60
|
4
|
7
|
9.879
|
0.019
|
-6.71E-03
|
-1.99E-05
|
2.04E-14
|
99.1
|
9.847
|
98.4±0.7
|
1.50E-03
|
-0.014
|
|
61
|
4
|
7
|
8.967
|
0.015
|
3.57E-03
|
5.28E-04
|
3.70E-14
|
97.5
|
8.774
|
88.0±0.4
|
4.67E-04
|
0.007
|
|
62
|
4
|
7
|
8.449
|
0.013
|
4.66E-03
|
3.93E-04
|
5.15E-14
|
97.9
|
8.296
|
83.3±0.3
|
4.40E-05
|
0.009
|
|
63
|
4
|
11
|
8.470
|
0.013
|
-9.20E-04
|
2.82E-04
|
5.13E-14
|
98.3
|
8.349
|
83.8±0.3
|
4.17E-05
|
-0.002
|
|
64
|
4
|
7
|
9.050
|
0.019
|
1.72E-01
|
1.33E-03
|
1.20E-14
|
94.8
|
8.638
|
86.6±0.7
|
1.41E-03
|
0.348
|
|
65
|
4
|
7
|
8.630
|
0.014
|
-1.37E-03
|
3.96E-04
|
2.86E-14
|
97.8
|
8.476
|
85.0±0.5
|
2.53E-04
|
-0.003
|
|
66
|
4
|
7
|
8.646
|
0.014
|
-4.08E-03
|
3.22E-04
|
4.89E-14
|
98.2
|
8.513
|
85.4±0.3
|
1.25E-04
|
-0.008
|
|
67
|
4
|
7
|
9.760
|
0.018
|
-1.84E-03
|
5.40E-04
|
4.43E-14
|
97.7
|
9.563
|
95.7±0.3
|
1.26E-03
|
-0.004
|
|
68
|
4
|
7
|
9.178
|
0.017
|
3.53E-03
|
2.92E-04
|
2.17E-14
|
98.1
|
9.055
|
90.7±0.6
|
1.10E-03
|
0.007
|
|
69
|
4
|
7
|
8.584
|
0.013
|
5.91E-03
|
2.87E-04
|
2.49E-13
|
98.4
|
8.462
|
84.9±0.2
|
-1.02E-04
|
0.012
|
|
70
|
4
|
7
|
9.392
|
0.016
|
2.39E-02
|
9.58E-04
|
3.22E-14
|
96.3
|
9.074
|
90.9±0.5
|
5.93E-04
|
0.048
|
|
71
|
4
|
7
|
10.96
|
0.027
|
-1.29E-04
|
1.02E-03
|
9.16E-14
|
96.7
|
10.62
|
106.0±0.3
|
3.89E-03
|
0.000
|
|
72
|
4
|
7
|
9.045
|
0.016
|
-4.68E-04
|
3.57E-04
|
1.13E-13
|
98.2
|
8.903
|
89.2±0.2
|
7.76E-04
|
-0.001
|