Flow Date Sample K2O
(wt%)
40K
(ppm)
40Ar*
(ppm)x10-4
40Ar* (%) 40Ar*
Total40Ar
Total 40Ar
(ppm)
40Ar 36Ar 36Ar(ppm) x10-5 40Ar*
40K
Model Age
(Ma)
Uncertainty
(Ma)
(one sigma)
February 11, 1949 A
B
1.066
1.057
1.272
1.261
<0.2
0.75
-
3.75
-
0.0375
-
0.0020
296 310 -
0.645
<0.000016 0.000059 <0.27
1.0
-
0.2
June
4, 1954
A
B
1.034
1.087
1.234
1.297
<0.2
1.10
-
3.00
-
0.030
-
0.00367
288
308
-
1.192
<0.000016 0.000085 <0.27
1.5
-
0.1
June
30, 1954
A#1
A#2
B#1
B#2
C
1.074
0.977
0.944
0.995
1.097
1.281
1.166
1.126
1.186
1.308
<0.2
0.87
2.28
0.56
0.93
-
2.75
4.05
1.70
3.75
-
0.0275
0.0405
0.017
0.0375
-
0.00316 0.00691 0.00329 0.00248
285
306
311
304
311
-
1.033
2.222
1.082
0.798
<0.000016 0.000075 0.000202 0.000047 0.000071 <0.27
1.3
3.5
0.8
1.2
-
0.3
0.2
0.2
0.2
July
14, 1954
A
B
1.033
1.004
1.232
1.198
0.69
<0.2
3.40
-
0.034
-
0.00203
-
301
283
0.675
-
0.000056 <0.000017 1.0
<0.29
0.2
-
February 19, 1975 A
B
1.128
1.048
1.346
1.250
0.79
<0.2
2.55
-
0.0255
-
0.00310
-
307
291
1.010
-
0.000059 <0.000016 1.0
<0.27
0.2
-

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