40Ar/39Ar
TABLE DR-2.
analytical results for muscovite from Black Hills metasedimentary rocks
_______________________________________________________________________________
T
a
40
b
Ar
____
38
b
Ar
____
37
b
36
Ar
____
b
Ar
____
F
c
39
Ar
d
40
Ar*
e
K/Ca
f
K/Cl
g
Apparent
Ar
Ar
Ar
Ar
(%)
(%)
Age (Ma) h
(x100)
_________________________________________________________________________________________________
39
39
39
39
ST-116 muscovite Run #62B52m (J = 0.016357 wt. = 1.69mg)
575
625
650
675
700
725
750
770
790
810
830
850
860
870
880
890
900
910
920
930
950
985
1000
1030
1050
1075
1100
1130
1150
1175
73.84
84.04
86.18
84.17
81.55
80.94
135.6
87.80
86.60
85.13
88.50
89.32
89.03
87.98
87.83
87.38
86.91
87.10
87.29
87.26
87.22
87.72
87.63
88.20
88.38
90.28
90.19
91.13
88.23
87.03
0.0608
0.0187
0.0149
0.0143
0.0147
0.0150
0.0587
0.0149
0.0141
0.0136
0.0164
0.0117
0.0113
0.0129
0.0121
0.0113
0.0131
0.0125
0.0135
0.0102
0.0138
0.0112
0.0122
0.0115
0.0134
0.0130
0.0124
0.0114
0.0167
0.0090
0.0042
0.0058
0.0087
0.0114
0.0218
0.0129
0.0073
0.0023
0.0054
0.0076
0.0128
0.0099
0.0045
0.0004
0.0012
0.0027
0.0024
0.0046
0.0037
0.0028
0.0018
0.0023
0.0040
0.0019
0.0024
0.0047
0.0027
0.0076
0.0296
0.1152
1.190
0.903
0.565
0.141
0.470
0.651
19.23
1.310
0.499
0.395
0.125
0.084
0.028
0.032
0.025
0.024
0.178
0.069
0.076
0.093
0.116
0.076
0.045
0.064
0.108
0.105
0.059
0.023
0.114
0.240
70.30
81.35
84.49
83.73
80.14
78.99
78.76
83.91
85.10
83.94
88.10
89.05
88.92
87.86
87.74
87.28
86.36
86.87
87.04
86.96
86.86
87.47
87.47
87.99
88.03
89.95
89.99
91.03
87.88
86.31
0.25
0.29
0.22
0.28
0.35
0.42
0.45
1.01
1.13
0.81
8.13
17.41
5.76
11.28
5.54
2.13
1.25
1.81
1.59
1.27
1.27
1.87
3.92
5.69
7.20
9.06
6.27
2.46
0.70
0.17
95.20
96.80
98.10
99.50
98.30
97.60
58.10
95.60
98.30
98.60
99.60
99.70
99.90
99.90
99.90
99.90
99.40
99.80
99.70
99.70
99.60
99.70
99.80
99.80
99.60
99.70
99.80
99.90
99.60
99.20
123
89.9
60.1
46.0
24.0
40.5
72.0
224
97.8
69.1
40.9
53.0
117
1170
432
195
217
113
143
190
284
232
132
274
217
111
196
69.2
17.7
4.54
Integrated 88.74
0.0131
0.0055
0.190
88.16
100
99.34
95.7
109
838
1700
1600
1710
1760
443
3130
2180
2500
968
6830
>10000
2520
4070
>10000
2620
3260
2020
>10000
1870
>10000
3880
8570
2150
2570
3440
8910
914
>10000
1381
1526
1566
1556
1511
1496
1493
1559
1573
1559
1610
1621
1620
1607
1606
1600
1589
1595
1597
1596
1595
1602
1602
1609
1609
1632
1633
1645
1607
1588
2710
1611
“1610 ± 5”
(76% of 39Ar)
Plateau: 830 - 1050°C
± 19
± 17
± 22
± 18
± 15
± 13
± 22
± 6
± 6
± 8
± 6
± 4
± 3
± 5
± 3
± 3
± 5
± 4
± 4
± 5
± 5
± 5
± 3
± 2
± 6
± 5
± 3
± 4
± 9
± 28
PR-1 muscovite Run #71C64m (J = 0.018552 wt. = 1.6528mg 7.2 wt% K)
450
500
550
600
650
675
700
725
750
775
800
825
840
845
147.3
32.01
30.66
47.20
58.50
64.85
67.78
68.70
73.85
76.90
73.31
76.77
77.75
78.62
0.5006
0.1201
0.0538
0.0355
0.0191
0.0178
0.0168
0.0172
0.0299
0.0259
0.0144
0.0152
0.0136
0.0151
0.1489
0.0979
0.1039
0.0059
0.0273
0.0134
0.0245
0.0253
0.0711
0.0219
0.0214
0.0326
0.0160
0.0146
45.67
3.522
1.323
0.7571
0.5400
0.3807
0.3330
0.4269
1.706
1.788
0.0486
0.3019
0.1109
0.0611
12.37
21.59
26.73
44.94
56.88
63.70
66.77
67.42
68.79
71.59
73.14
75.85
77.39
78.41
0.06
0.09
0.08
0.11
0.22
0.23
0.32
0.47
0.66
0.92
1.48
3.65
3.48
4.29
8.40
67.51
87.27
95.26
97.28
98.27
98.55
98.17
93.18
93.13
99.81
98.84
99.58
99.77
3.51
5.34
5.03
88.8
19.1
39.1
21.4
20.7
7.36
23.9
24.4
16.0
32.7
35.7
13.0
51.4
132
235
830
1010
1210
1160
352
487
2150
1880
3310
1690
373
608
727
1094
1300
1407
1454
1464
1484
1525
1547
1585
1606
1620
± 93
± 22
± 18
± 12
± 6
± 6
± 5
± 5
± 14
± 11
± 8
± 5
± 3
± 3
850
855
860
865
875
880
885
900
925
950
975
1000
1020
1040
1060
1080
1100
1120
1140
1175
1250
78.88
78.84
78.16
77.66
77.55
77.56
77.58
77.73
77.45
77.53
77.58
77.66
77.65
77.45
78.34
77.55
78.72
78.84
79.89
80.22
77.98
0.0131
0.0148
0.0149
0.0141
0.0143
0.0141
0.0136
0.0137
0.0134
0.0134
0.0142
0.0137
0.0138
0.0133
0.0141
0.0143
0.0136
0.0142
0.0158
0.0149
0.0182
0.0211
0.0117
0.0154
0.0264
0.0086
0.0274
0.0382
0.0330
0.0574
0.0156
0.0337
0.0198
0.0484
0.0372
0.0351
0.0108
0.0404
0.0165
0.0296
0.1047
0.0353
0.0647
0.0210
0.0494
0.0295
0.0227
0.0427
0.0852
0.0518
0.0427
0.0294
0.0327
0.0324
0.0466
0.0370
0.0144
0.0425
0.0574
0.0179
0.0217
0.1103
0.1441
78.66
78.75
77.99
77.55
77.45
77.41
77.30
77.56
77.30
77.41
77.46
77.54
77.49
77.31
78.28
77.39
78.52
78.76
79.80
79.88
77.53
5.58
5.17
4.43
3.81
4.10
3.56
3.01
3.48
4.73
4.61
4.08
3.68
3.42
3.59
3.94
4.99
5.59
5.87
3.88
1.70
0.73
99.76
99.92
99.82
99.89
99.91
99.84
99.68
99.81
99.84
99.89
99.88
99.88
99.83
99.86
99.95
99.84
99.79
99.94
99.92
99.61
99.46
Integrated 77.76
0.0148
0.0279
0.1179
77.38
100
99.56
24.8
44.7
34.0
19.8
60.7
19.1
13.7
15.9
9.11
33.5
15.5
26.4
10.8
14.1
14.9
48.6
13.0
31.7
17.7
4.99
14.8
18.8
4440
1820
1760
2390
2190
2350
3350
3000
3650
3460
2260
2920
2830
3860
2320
2170
3210
2220
1330
1820
853
1623
1625
1614
1608
1607
1606
1605
1608
1605
1606
1607
1608
1607
1605
1618
1606
1622
1625
1639
1640
1608
1880
1606
(51% of 39Ar)
Plateau: 865 - 1080°C
± 3
± 5
± 4
± 5
± 3
± 3
± 3
± 6
± 4
± 3
± 3
± 5
± 5
± 4
± 5
± 3
± 4
± 3
± 5
± 7
± 12
1608 ± 4
ST-106 muscovite Run #62B45m (J = 0.016343 wt. = 0.95mg)
600
675
725
775
800
830
850
855
860
865
875
880
885
900
925
950
975
1000
1020
1040
1060
1085
1100
1120
1140
1175
1250
75.47
81.45
104.9
91.09
87.08
87.54
88.40
89.13
88.34
87.66
87.79
87.90
87.79
87.50
87.98
87.39
88.54
87.88
88.33
88.35
89.30
89.64
89.62
90.66
91.68
90.74
89.44
0.0774
0.0167
0.0455
0.0169
0.0119
0.0119
0.0108
0.0124
0.0118
0.0119
0.0115
0.0116
0.0133
0.0131
0.0119
0.0122
0.0107
0.0129
0.0128
0.0146
0.0121
0.0122
0.0133
0.0118
0.0129
0.0167
0.0127
0.0525
0.0403
0.0199
0.0160
0.0071
0.0074
0.0017
0.0054
0.0056
0.0237
0.0067
0.0059
0.0233
0.0090
0.0053
0.0090
0.0108
0.0140
0.0112
0.0215
0.0109
0.0054
0.0060
0.0078
0.0271
0.0663
0.1042
1.660
0.114
10.44
2.260
0.375
0.156
0.152
0.135
0.221
0.050
0.047
0.066
0.071
0.035
0.050
0.120
0.049
0.113
0.122
0.102
0.107
0.084
0.099
0.081
0.286
0.122
0.070
70.55
81.09
74.08
84.39
85.95
87.05
87.92
88.71
87.66
87.49
87.63
87.68
87.56
87.38
87.81
87.01
88.37
87.53
87.95
88.02
88.96
89.37
89.30
90.39
90.82
90.36
89.22
0.38
1.00
1.05
2.15
1.87
2.62
4.42
4.72
3.92
3.93
3.97
3.88
3.32
3.67
4.80
5.78
5.01
4.10
3.36
3.26
5.50
10.45
5.88
7.16
1.46
0.78
1.57
93.50
99.60
70.60
92.70
98.70
99.50
99.50
99.60
99.30
99.80
99.90
99.80
99.80
99.90
99.80
99.60
99.90
99.60
99.60
99.70
99.60
99.70
99.70
99.70
99.10
99.60
99.80
Integrated 88.77
0.0130
0.0121
0.265
87.96
100
99.09
Plateau: 850 - 1040°C
(58% of 39Ar)
9.96
82.2
13.0
914
26.3
345
32.7
2780
73.9 >10000
70.8
5980
313
>10000
97.6
3790
93.2
8500
22.1
5050
78.2
8130
89.1
7400
22.4
2180
58.0
2310
99.1
5040
58.0
4340
48.6 >10000
37.4
2720
46.7
2860
24.3
1440
48.0
4630
96.7
4110
87.9
2230
66.7
5950
19.3
3280
7.89
916
5.02
2920
43.1
3030
1383
1522
1431
1564
1583
1596
1607
1616
1604
1602
1603
1604
1603
1600
1606
1596
1612
1602
1607
1608
1619
1624
1624
1637
1642
1636
1623
± 31
± 13
± 23
± 7
± 7
± 5
± 5
± 5
± 5
± 4
± 4
± 4
± 5
± 5
± 4
± 3
± 4
± 4
± 5
± 5
± 4
± 3
± 4
± 3
± 10
± 16
± 9
1607
“1605 ± 5”
SI-47 muscovite Run #57L17m (J = 0.015120 wt. = 1.60mg)
520
580
630
660
690
710
730
750
770
790
810
830
850
870
900
930
960
990
1020
1050
1080
1120
1180
1250
1500
70.49
73.52
181.3
101.1
88.42
90.43
87.23
90.74
90.85
92.38
94.15
95.34
95.27
93.92
93.05
93.77
94.51
94.80
94.85
96.99
96.76
97.54
86.06
98.35
103.5
0.2422
0.0047
0.2647
0.0047
0.0104
0.0133
0.0124
0.0117
0.0116
0.0114
0.0117
0.0121
0.0122
0.0125
0.0121
0.0121
0.0121
0.0117
0.0114
0.0116
0.0117
0.0122
0.0106
0.0288
0.0194
0.1331
0.2083
0.0770
0.0117
0.0130
0.0080
0.0246
0.0019
0.0028
0.0028
0.0062
0.0017
0.0018
0.0082
0.0036
0.0033
0.0015
0.0010
0.0114
0.0055
0.0053
0.0035
0.1297
0.1453
0.0384
19.85
0.159
35.13
2.038
0.410
0.380
0.470
0.172
0.453
0.237
0.047
0.044
0.009
0.148
0.089
0.136
0.023
0.025
0.145
-0.021
0.102
0.025
2.394
5.060
4.367
11.81
73.05
77.53
95.10
88.52
89.28
85.82
90.21
89.48
91.65
93.99
95.18
95.22
93.46
92.76
93.35
94.42
94.70
94.40
97.03
96.43
97.45
78.98
83.39
90.62
0.26
0.44
0.67
0.46
1.46
2.24
0.70
0.87
1.01
1.43
3.17
10.56
8.15
3.74
4.22
4.56
5.08
6.85
11.32
12.11
12.80
7.23
0.22
0.14
0.32
16.80
99.40
42.80
94.00
100.10
98.80
98.40
99.40
98.50
99.20
99.90
99.90
100.00
99.50
99.70
99.60
99.90
99.90
99.50
100.10
99.70
99.90
91.80
84.80
87.50
3.93
2.51
6.79
44.8
40.2
65.5
21.2
274
189
186
85.0
308
290
64.2
147
159
353
503
46.1
95.1
99.0
149
4.03
3.60
13.6
26.9
812
27.8
530
2009
2920
6760
8660
>10000
>10000
6030
4130
3690
3530
4610
4700
4110
6240
>10000
6100
7140
3890
1110
616
>10000
296
1342
1400
1608
1533
1541
1501
1552
1544
1569
1595
1609
1609
1589
1581
1588
1600
1603
1600
1629
1623
1634
1418
1472
1557
Integrated 95.54
0.0141
0.0072
0.396
94.34
100
98.75
72.4
2000
1599
24.3
188
274
205
267
460
1460
972
2220
1430
877
1000
4970
1320
1900
2740
1930
5510
1230
2430
2610
11000
1740
3900
1460
2760
814
565
1078
1345
1429
1517
1518
1593
1592
1605
1605
1588
1595
1586
1591
1591
1597
1598
1602
1593
1595
1601
1606
1607
1615
1607
1617
1606
± 58
± 16
± 31
± 19
± 7
± 6
± 13
± 9
± 10
± 8
± 5
± 4
± 4
± 6
± 5
± 5
± 5
± 4
± 8
± 7
± 8
± 4
± 44
± 63
± 26
ST-61 muscovite Run #71C58m (J = 0.018592 wt. = 1.9089mg 5.2 wt% K)
600
675
725
775
800
830
745
855
860
865
875
880
885
900
925
950
975
1000
1020
1040
1060
1080
1100
1120
1140
1175
1250
82.22
43.44
59.72
72.91
70.55
71.12
76.48
76.31
77.33
77.26
76.05
76.66
75.88
76.30
76.25
76.73
76.82
77.15
76.39
76.51
76.91
77.34
77.50
78.06
77.57
78.12
78.09
0.2661
0.0392
0.0310
0.0423
0.0311
0.0233
0.0155
0.0173
0.0143
0.0156
0.0179
0.0172
0.0130
0.0159
0.0146
0.0138
0.0146
0.0129
0.0161
0.0140
0.0139
0.0124
0.0150
0.0133
0.0156
0.0138
0.0188
0.0000
0.0000
0.0000
0.0728
0.0214
0.0040
0.0197
0.0241
0.0214
0.0082
0.0094
0.0061
0.0193
0.0071
0.0091
0.0148
0.0320
0.0192
0.0546
0.0358
0.0348
0.0218
0.0635
0.0498
0.0808
0.1892
0.2635
21.13
-0.1895
0.0473
2.674
-0.1244
0.0479
0.0529
0.0317
0.0439
0.0370
0.0433
0.0668
0.0310
0.0573
0.0199
0.0348
0.0513
0.0571
0.0292
0.0159
0.0191
0.0402
0.0730
0.0442
0.0924
0.0231
0.2854
19.77
43.97
59.55
64.99
70.89
70.95
76.29
76.19
77.18
77.12
75.89
76.44
75.76
76.10
76.17
76.60
76.64
76.95
76.28
76.43
76.83
77.19
77.27
77.91
77.28
78.05
77.25
0.21
0.46
0.79
1.66
1.68
2.71
7.73
18.11
3.03
4.14
3.44
2.81
2.64
3.03
5.03
6.04
5.52
4.72
3.95
3.72
3.64
3.89
3.38
3.49
2.01
1.21
0.95
24.05 >10000
101.29 >10000
99.77 >10000
89.17
7.19
100.53
24.4
99.80
132
99.80
26.6
99.88
21.7
99.84
24.5
99.86
63.7
99.83
55.8
99.74
86.4
99.88
27.1
99.78
73.7
99.92
57.7
99.87
35.3
99.81
16.3
99.78
27.2
99.89
9.57
99.94
14.6
99.93
15.0
99.85
24.0
99.73
8.24
99.84
10.5
99.66
6.47
99.94
2.76
98.95
1.98
± 86
± 12
± 10
± 8
± 7
± 6
± 4
± 6
± 6
± 5
± 4
± 6
± 7
± 4
± 5
± 4
± 3
± 4
± 4
± 4
± 5
± 5
± 4
± 5
± 5
± 9
± 11
Integrated 76.15
0.0169
0.0297
0.1286
75.74
100
99.50
17.6
1070
“1595 ± 5”
(78% of 39Ar)
Plateau: 845 - 1060°C
1586
MR-13A muscovite Run #55B5n (J = 0.007436 wt. = 26.20mg)
450
575
650
725
850
900
950
1000
1040
1080
1120
1180
1250
1500
305.8
195.4
236.1
181.1
191.3
190.2
186.4
187.6
191.3
191.1
191.6
191.6
198.8
197.2
0.5027
0.1361
0.0693
0.0124
0.0405
0.0381
0.0451
0.0520
0.0081
0.0077
0.0047
0.0090
0.0098
0.0152
0.4126
0.0940
0.0872
0.0564
0.0310
0.0404
0.0465
0.0398
0.0229
0.0377
0.0442
0.0614
0.1177
0.1561
16.4144
4.2132
2.5081
2.7142
0.7970
0.0905
0.2012
0.1316
0.0988
0.1047
0.1446
0.3911
0.1322
0.6699
257.4
183.0
228.7
173.0
188.9
189.9
185.8
187.2
191.0
190.8
191.2
190.4
198.4
195.2
0.06
0.27
1.11
1.11
4.57
28.59
9.22
18.41
15.06
10.57
5.10
1.96
2.84
1.11
84.15
93.63
96.86
95.56
98.76
99.85
99.67
99.78
99.84
99.83
99.77
99.39
99.80
98.99
1.27
5.56
5.99
9.26
16.88
12.93
11.25
13.14
22.79
13.85
11.82
8.52
4.44
3.35
Integrated 190.6
0.0310
0.0427
0.2368
189.9
100
99.62
12.25
11.3
44.4
97.0
>10000
185
192
154
127
>10000
>10000
>10000
>10000
>10000
1640
1930
1550
1792
1492
1583
1589
1566
1574
1595
1594
1596
1591
1635
1617
264
1589
10.8
23.3
56.0
54.6
68.3
78.4
81.5
218
228
189
202
40.2
188
508
963
2300
2920
9090
4560
3440
4180
3020
6090
1350
1930
1480
4070
708
452
906
347
638
5500
307
371
209
454
632
1310
1344
1303
2031
1582
1524
1503
1773
1355
1507
1596
1590
1595
1558
1620
1618
1626
1628
1629
1652
1653
1660
1688
1584
1613
1630
1642
1582
1590
1570
1560
1546
±
±
±
±
±
±
±
±
±
±
±
±
±
±
8
6
6
6
5
5
5
5
5
5
5
5
5
5
MR-13A muscovite Run #55B16m (J = 0.007495 wt. = 1.78mg)
350
400
450
475
525
550
575
600
620
640
660
680
700
720
740
780
800
820
840
860
880
900
920
935
950
965
980
995
1010
1025
1040
1055
1070
1085
1100
246.2
119.2
77.65
119.9
143.9
153.4
214.3
185.3
176.2
175.9
226.1
419.0
264.4
189.7
191.0
190.6
184.0
194.8
194.1
195.4
196.0
196.5
200.3
201.1
202.7
207.8
195.7
202.3
207.8
213.0
207.1
208.4
209.1
202.3
201.7
0.6025
0.2871
0.1248
0.0959
0.0904
0.0950
0.0354
0.0356
0.0350
0.0410
0.0400
0.3126
0.0966
0.0214
0.0182
0.0138
0.0132
0.0119
0.0122
0.0125
0.0124
0.0130
0.0119
0.0154
0.0144
0.0152
0.0173
0.0245
0.0305
0.0270
0.0397
0.0323
0.0281
0.0412
0.0391
225.7
93.17
68.85
28.32
36.31
64.20
20.00
10.29
9.755
5.750
6.682
2.840
3.089
1.977
2.604
0.5525
0.2087
0.5281
0.2876
0.2030
0.2793
0.4079
0.3141
0.5563
0.4549
0.9244
0.6262
1.776
3.301
4.394
5.847
3.842
5.425
6.623
5.175
83.98
30.42
9.830
6.040
0.820
7.660
5.544
0.030
0.286
1.170
1.520
91.43
30.73
0.097
0.942
0.375
0.332
0.269
0.137
0.102
0.188
0.254
0.155
0.383
0.472
0.434
2.760
3.310
4.197
5.380
7.118
6.914
8.440
6.854
7.350
16.40
38.15
55.96
142.3
147.5
141.3
278.0
187.2
177.1
173.5
223.0
149.3
174.1
189.8
188.7
189.6
183.0
194.1
193.7
195.2
195.4
195.8
199.9
200.1
201.4
206.7
187.6
192.9
196.0
198.0
187.2
188.7
185.2
183.3
180.9
0.10
0.23
0.40
0.02
0.03
0.46
0.02
0.07
0.09
0.11
0.15
0.24
0.23
0.30
0.38
0.99
2.71
7.24
13.47
16.87
13.89
10.39
8.92
7.82
7.64
4.50
0.58
0.39
0.24
0.15
0.14
0.12
0.11
0.12
0.13
5.70
30.00
68.80
116.60
100.10
88.20
129.70
100.30
99.90
98.30
98.20
35.60
65.70
99.90
98.60
99.40
99.50
99.60
99.80
99.90
99.70
99.60
99.80
99.50
99.30
99.40
95.90
95.20
94.10
92.70
90.00
90.30
88.30
90.20
89.40
±401
± 90
± 42
± 87
± 81
± 32
±133
± 34
± 29
± 26
± 22
± 50
± 24
± 15
± 12
± 6
± 4
± 8
± 4
± 5
± 6
± 6
± 6
± 8
± 7
± 9
± 14
± 12
± 16
± 24
± 25
± 28
± 26
± 30
± 26
1115
1130
1145
1160
1180
1200
1250
1300
211.6
224.3
219.9
232.9
215.9
241.1
257.5
271.5
0.0358
0.0294
0.0389
0.0437
0.0419
0.0449
0.0678
0.0997
5.638
5.049
5.799
8.070
4.704
6.775
7.689
23.87
7.180
8.230
8.910
10.91
8.650
10.12
14.43
25.49
191.5
201.0
194.7
202.3
191.3
212.6
216.5
201.0
0.11
0.10
0.09
0.08
0.12
0.12
0.10
0.03
90.20
89.30
88.20
86.40
88.30
87.80
83.60
72.90
473
1940
480
446
361
360
178
133
1606
1658
1624
1665
1604
1719
1740
1658
Integrated 197.3
0.0166
1.562
0.912
194.9
100
98.78
1300
1624
263
704
526
3810
>10000
8670
6260
3600
3170
6110
4990
4100
4420
3940
4040
6270
2820
>10000
6060
4010
3130
6160
>10000
5350
4190
3620
7210
1078
1467
1455
1555
1558
1572
1577
1585
1588
1582
1583
1592
1589
1587
1584
1588
1585
1586
1581
1585
1591
1590
1599
1607
1607
1615
1617
4150
1585
± 25
± 32
± 32
± 40
± 30
± 29
± 34
± 92
ST-60 muscovite Run #62B31m (J = 0.016296 wt. = 1.81mg)
600
675
725
775
800
830
850
855
960
865
875
880
885
900
925
950
975
1000
1020
1050
1065
1090
1100
1125
1140
1175
1250
52.24
78.18
86.35
84.69
84.39
85.50
86.03
86.54
86.73
86.25
86.39
87.03
86.77
86.74
86.37
86.76
86.52
86.65
86.35
86.55
86.96
86.90
87.72
88.33
88.43
88.98
89.14
0.0319
0.0189
0.0272
0.0126
0.0114
0.0115
0.0118
0.0123
0.0125
0.0117
0.0119
0.0121
0.0120
0.0122
0.0121
0.0117
0.0127
0.0114
0.0118
0.0122
0.0125
0.0117
0.0109
0.0118
0.0122
0.0123
0.0115
0.0003
0.0105
0.0164
0.0019
0.0023
0.0012
0.0052
0.0018
0.0013
0.0028
0.0014
0.0006
0.0007
0.0018
0.0008
0.0011
0.0010
0.0009
0.0007
0.0015
0.0022
0.0034
0.0003
0.0019
0.0011
0.0024
0.0030
0.688
0.380
3.460
0.260
0.069
0.068
0.104
0.043
0.045
0.040
0.045
0.030
0.026
0.055
0.020
0.052
0.043
0.052
0.090
0.069
0.033
0.047
0.065
0.029
0.071
0.047
0.025
50.18
77.03
76.10
83.90
84.16
85.27
85.70
86.39
86.58
86.11
86.24
86.91
86.66
86.55
86.28
86.58
86.37
86.47
86.06
86.33
86.84
86.74
87.51
88.22
88.19
88.82
89.04
0.31
0.66
1.20
1.78
2.47
5.87
7.12
6.24
5.03
4.04
3.99
3.34
3.13
3.72
4.34
4.41
4.03
3.81
2.61
2.71
2.79
4.10
4.68
5.08
4.30
4.51
3.74
96.10
98.60
88.10
99.10
99.80
99.80
99.60
99.90
99.80
99.90
99.80
99.90
99.90
99.80
99.90
99.80
99.90
99.80
99.70
99.80
99.90
99.80
99.80
99.90
99.80
99.80
99.90
1640
49.6
31.9
275
232
425
101
299
393
187
368
856
747
299
655
489
551
594
795
349
237
154
1660
272
498
219
173
Integrated 86.68
0.0122
0.0020
0.101
86.36
100
99.63
256
(58% of 39Ar)
Plateau: 855 - 1090°C
± 15
± 8
± 7
± 4
± 4
± 3
± 6
± 2
± 2
± 3
± 3
± 3
± 3
± 2
± 3
± 3
± 3
± 3
± 3
± 4
± 3
± 3
± 3
± 3
± 2
± 2
± 3
1586 ± 4
ST-68 muscovite Run #71C60m (J = 0.018580 wt. = 1.5825mg 7.4 wt% K)
450
500
550
600
650
675
700
725
750
775
800
825
840
41.63
18.71
22.07
36.37
47.64
56.82
58.92
61.06
60.27
72.55
63.59
69.20
74.05
0.3090
0.1318
0.0741
0.0539
0.0255
0.0189
0.0186
0.0204
0.0264
0.0347
0.0176
0.0137
0.0152
0.0727
0.0857
0.1219
0.0107
0.0285
0.0420
0.0070
0.0399
0.0605
0.0720
0.0033
0.0162
0.0142
8.621
1.396
1.039
0.6981
0.2851
0.4321
0.2414
0.4215
0.7636
3.779
0.0166
0.1224
0.0639
16.15
14.57
18.98
34.28
46.77
55.52
58.18
59.79
57.99
61.36
63.51
68.81
73.83
0.08
0.11
0.11
0.12
0.22
0.23
0.32
0.47
0.75
1.13
1.81
3.58
4.82
38.83
77.99
86.13
94.33
98.24
97.76
98.79
97.97
96.26
84.61
99.92
99.48
99.75
7.20
6.10
4.29
49.1
18.4
12.4
74.2
13.1
8.64
7.26
160
32.2
36.8
18.6
44.5
86.6
128
397
840
826
671
399
331
914
3140
1630
473
432
545
889
1128
1279
1322
1348
1319
1373
1406
1486
1558
± 29
± 18
± 15
± 11
± 8
± 7
± 7
± 5
± 10
± 10
± 6
± 4
± 4
845
850
855
860
865
875
880
885
900
925
950
975
1000
1020
1040
1060
1080
1100
1120
1140
1175
1250
74.95
75.46
75.61
75.15
75.40
75.33
75.14
75.36
75.68
75.78
75.50
74.92
74.55
74.67
75.62
75.75
76.45
77.78
78.46
78.68
76.80
74.52
0.0127
0.0133
0.0151
0.0138
0.0129
0.0128
0.0143
0.0150
0.0146
0.0129
0.0130
0.0139
0.0125
0.0131
0.0136
0.0129
0.0131
0.0139
0.0137
0.0143
0.0119
0.0172
0.0256
0.0225
0.0123
0.0461
0.0105
0.0033
0.0300
0.0031
0.0112
0.0372
0.0170
0.0017
0.0221
-0.0009
0.0146
0.0157
0.0103
0.0471
0.0290
0.0259
0.0608
0.1964
0.0740
0.0310
0.0270
0.0309
0.0135
0.0635
0.0159
0.0585
0.0114
0.0193
0.0164
0.0192
0.0636
0.0086
0.0158
0.0150
0.0167
0.0303
0.0187
0.0790
0.0257
0.3783
74.70
75.34
75.51
75.03
75.33
75.12
75.06
75.16
75.62
75.69
75.42
74.84
74.33
74.61
75.55
75.68
76.37
77.67
78.38
78.42
76.70
73.40
3.50
3.03
2.91
2.99
2.82
3.39
2.76
2.50
3.12
4.58
4.98
5.15
5.07
4.62
4.67
5.47
6.42
6.09
5.81
3.94
1.90
0.57
99.71
99.88
99.90
99.88
99.95
99.75
99.94
99.77
99.96
99.93
99.94
99.92
99.75
99.97
99.94
99.94
99.94
99.89
99.93
99.71
99.91
98.52
Integrated 74.82
0.0145
0.0220
0.0981
74.50
100
99.62
20.5
7390
23.3
3780
42.5
1620
11.3
2790
49.7
5090
160
6240
17.4
2150
168
1690
46.6
1910
14.1
5040
30.8
4710
317
2560
23.7
9020
368
4100
35.7
3000
33.3
5230
50.8
4140
11.1
2670
18.0
2880
20.2
2270
8.61 >10000
2.66
1120
23.8
2090
± 6
± 4
± 5
± 4
± 4
± 3
± 4
± 5
± 6
± 3
± 4
± 5
± 3
± 4
± 5
± 4
± 4
± 3
± 3
± 5
± 7
± 10
1567
“1577 ± 5”
(62% of 39Ar)
Plateau: 845 - 1060°C
1570
1579
1582
1575
1579
1576
1575
1577
1583
1584
1580
1572
1565
1569
1582
1584
1594
1611
1621
1622
1598
1552
ST-103 muscovite Run #62B38m (J = 0.016320 wt. = 1.73mg)
450
500
575
600
625
650
675
700
720
740
760
780
800
820
840
860
880
900
925
950
975
1000
1025
1050
1075
1100
1150
1200
30.26
27.39
43.87
57.03
64.50
69.29
71.73
72.34
76.85
80.58
79.62
78.00
79.06
79.60
81.13
82.47
83.10
83.26
83.46
83.84
84.46
85.07
85.99
86.21
87.51
88.73
89.36
88.57
0.1134
0.0799
0.0307
0.0217
0.0173
0.0076
0.0113
0.0147
0.0178
0.0165
0.0136
0.0122
0.0122
0.0119
0.0124
0.0123
0.0112
0.0117
0.0116
0.0120
0.0111
0.0124
0.0117
0.0125
0.0122
0.0125
0.0127
0.0176
0.0125
0.0481
0.0224
0.0216
0.0216
0.0025
0.0165
0.0217
0.0161
0.0087
0.0037
0.0076
0.0075
0.0092
0.0100
0.0123
0.0059
0.0065
0.0065
0.0106
0.0087
0.0140
0.0134
0.0116
0.0122
0.0152
0.0601
0.3122
1.710
0.948
1.113
0.798
0.800
0.406
0.147
0.105
1.180
1.090
0.243
0.113
0.077
0.071
0.098
0.119
0.031
0.020
0.044
0.044
0.054
0.060
0.051
0.046
0.081
0.049
0.075
0.094
25.19
24.57
40.56
54.65
62.12
68.06
71.28
72.01
73.34
77.34
78.87
77.64
78.80
79.37
80.82
82.09
82.98
83.18
83.31
83.69
84.28
84.87
85.81
86.06
87.25
88.56
89.12
88.31
0.12
0.14
0.27
0.26
0.33
0.46
0.67
1.19
1.51
1.76
1.69
2.27
3.11
3.51
4.68
10.89
7.07
7.22
9.43
8.20
6.04
4.77
4.17
4.60
5.68
5.93
3.44
0.59
83.30
89.80
92.50
95.90
96.30
98.30
99.40
99.60
95.50
96.00
99.10
99.60
99.70
99.70
99.60
99.60
99.90
99.90
99.90
99.80
99.80
99.80
99.80
99.80
99.70
99.80
99.80
99.70
41.8
10.9
23.3
24.2
24.2
213
31.7
24.1
32.5
59.8
143
68.6
69.5
57.2
52.3
42.5
88.3
80.8
80.5
49.3
60.0
37.4
39.0
45.1
42.9
34.4
8.70
1.67
52.5
77.5
293
554
1040
>10000
>10000
1400
1090
1420
2200
4290
4060
5240
3610
4000
>10000
5850
6990
4550
>10000
3440
6260
3180
4090
3190
2880
788
621
608
916
1150
1263
1348
1392
1402
1420
1473
1493
1477
1492
1499
1517
1534
1545
1547
1549
1554
1561
1568
1580
1583
1597
1613
1620
1610
Integrated 83.11
0.0125
0.0138
0.114
82.75
100
99.57
37.9
3380
1542
± 52
± 42
± 22
± 23
± 19
± 14
± 9
± 6
± 5
± 5
± 5
± 4
± 3
± 3
± 3
± 5
± 3
± 3
± 2
± 2
± 4
± 3
± 3
± 3
± 3
± 3
± 3
± 13
ST-17 muscovite Run #62B17m (J = 0.016222 wt. = 1.15mg)
625
675
730
780
810
825
840
850
860
870
875
880
885
900
925
950
975
1000
1025
1040
1070
1090
1105
1120
1140
1175
1210
1250
1300
60.89
75.42
106.2
83.46
78.19
81.03
80.91
81.02
80.97
80.27
79.62
81.31
79.66
79.97
79.21
79.29
79.69
78.98
78.58
78.67
79.55
79.46
79.27
79.91
80.44
82.50
82.07
82.34
79.77
0.0572
0.0208
0.0464
0.0196
0.0117
0.0114
0.0122
0.0124
0.0132
0.0128
0.0114
0.0116
0.0117
0.0128
0.0128
0.0114
0.0122
0.0120
0.0108
0.0125
0.0107
0.0122
0.0112
0.0115
0.0123
0.0136
0.0128
0.0151
0.0037
0.0161
0.0017
0.0018
0.0020
0.0012
0.0016
0.0006
0.0030
0.0016
0.0022
0.0021
0.0020
0.0043
0.0046
0.0030
0.0065
0.0037
0.0089
0.0025
0.0059
0.0068
0.0094
0.0060
0.0064
0.0068
0.0106
0.0115
0.0410
0.0225
1.928
0.632
12.88
3.124
0.140
0.139
0.185
0.153
0.214
0.389
0.073
0.109
0.299
0.104
0.197
0.155
0.310
0.232
0.070
0.148
0.097
0.099
0.106
0.051
0.026
0.260
0.085
0.137
0.700
55.17
73.53
68.13
74.20
77.75
80.60
80.34
80.54
80.31
79.09
79.38
80.97
78.75
79.64
78.61
78.81
78.75
78.28
78.35
78.21
79.24
79.14
78.94
79.74
80.34
81.71
81.80
81.91
77.68
0.44
0.90
0.94
1.90
11.22
31.43
5.92
2.70
1.93
1.54
1.43
1.57
1.44
1.61
1.90
1.86
1.72
2.39
2.68
2.46
2.62
3.01
2.72
5.28
3.82
2.19
1.23
0.78
0.37
90.60
97.50
64.20
88.90
99.50
99.50
99.30
99.40
99.20
98.60
99.70
100.00
98.90
99.60
99.30
99.40
98.80
99.10
99.70
99.40
99.60
99.60
99.60
99.80
99.90
99.10
99.70
99.50
97.40
Integrated 80.36
0.0125
0.0038
0.334
79.35
100
98.74
0.37
0.89
1.44
2.90
2.65
2.08
2.57
3.05
9.40
5.77
4.04
2.97
2.99
3.84
6.68
4.23
3.53
3.32
4.94
6.82
7.97
8.14
5.50
2.83
1.08
88.60
98.70
69.70
96.80
98.90
99.70
99.80
99.80
99.80
99.70
99.60
99.60
99.70
99.70
99.80
99.80
99.60
99.60
99.90
99.80
100.00
99.90
99.80
99.40
99.00
32.5
305
297
262
443
321
911
176
330
233
249
265
121
114
173
80.7
142
58.7
210
88.2
77.3
55.9
87.1
82.1
76.6
49.4
45.3
12.7
23.3
137
122
590
457
1760
7410
14100
4840
4020
2600
3900
>10000
8720
>10000
2890
3120
>10000
6210
6440
>10000
3650
>10000
4220
>10000
7910
3490
2260
2730
1270
919
1153
1417
1343
1425
1472
1508
1505
1508
1505
1489
1493
1513
1485
1496
1483
1486
1485
1479
1480
1478
1491
1490
1487
1498
1505
1522
1524
1525
1471
4570
1493
77.6
851
418
2230
6520
3940
4400
5760
4520
3520
6020
>10000
2910
3790
3080
3950
3320
1670
3080
3060
4000
6960
9860
2730
2680
1051
1406
1399
1446
1487
1503
1515
1525
1525
1509
1504
1492
1488
1489
1480
1478
1480
1487
1491
1489
1501
1501
1514
1520
1503
± 22
± 12
± 18
± 8
± 2
± 4
± 3
± 5
± 7
± 8
± 8
± 7
± 9
± 7
± 6
± 6
± 8
± 6
± 5
± 5
± 5
± 4
± 4
± 3
± 4
± 5
± 9
± 12
± 25
ST-17 muscovite Run #62B19m (J = 0.016236 wt. = 1.48mg)
650
700
750
800
820
830
840
850
860
870
880
895
910
940
970
1000
1030
1060
1090
1120
1150
1180
1200
1230
1250
54.98
73.67
103.5
78.19
79.77
80.39
81.25
81.96
82.02
80.89
80.49
79.60
79.15
79.28
78.46
78.40
78.63
79.17
79.33
79.21
79.97
80.07
81.20
81.93
80.96
0.0820
0.0175
0.0432
0.0147
0.0121
0.0123
0.0121
0.0118
0.0120
0.0124
0.0118
0.0111
0.0127
0.0123
0.0126
0.0122
0.0125
0.0141
0.0125
0.0126
0.0121
0.0116
0.0114
0.0130
0.0133
0.0264
0.0209
0.0158
0.0051
0.0062
0.0018
0.0036
0.0034
0.0013
0.0031
0.0051
0.0065
0.0050
0.0036
0.0018
0.0048
0.0092
0.0058
0.0055
0.0045
0.0058
0.0074
0.0090
0.0143
0.0385
2.125
0.326
10.60
0.837
0.305
0.085
0.061
0.044
0.065
0.091
0.101
0.120
0.072
0.093
0.046
0.064
0.097
0.102
0.039
0.059
0.011
0.033
0.062
0.168
0.286
48.67
72.69
72.19
75.70
78.85
80.12
81.05
81.81
81.80
80.59
80.17
79.23
78.91
78.98
78.30
78.18
78.32
78.85
79.19
79.02
79.91
79.95
81.00
81.41
80.09
19.8
25.0
33.0
102
84.9
291
146
153
397
169
103
80.0
104
144
296
110
56.8
89.4
94.9
117
89.5
70.6
57.8
36.5
13.6
± 20
± 9
± 10
± 4
± 4
± 5
± 4
± 4
± 2
± 3
± 3
± 3
± 4
± 3
± 3
± 3
± 4
± 4
± 3
± 3
± 2
± 2
± 3
± 4
± 8
Integrated 80.23
0.0130
0.0059
0.258
79.44
100
99.02
89.4
2910
1495
0.63
0.46
0.55
0.57
0.86
0.98
1.27
1.47
1.66
1.89
3.65
7.93
7.99
6.63
5.81
4.92
4.17
3.57
3.20
2.44
2.56
2.71
2.93
2.95
3.31
20.73
1.86
0.56
0.73
0.99
92.30
95.90
97.00
96.60
97.80
82.20
80.60
98.40
98.80
99.60
99.70
99.80
99.80
99.80
99.90
99.70
99.70
99.50
99.90
99.50
99.70
99.50
99.60
99.70
99.90
99.70
99.70
98.70
98.50
98.40
31.4
62.5
39.5
78.9
64.1
27.0
28.2
129
39.3
26.1
49.8
70.0
77.1
86.3
81.9
67.3
54.2
89.9
65.3
74.2
53.8
34.8
43.8
45.6
118
74.8
21.9
35.2
10.4
5.56
68.0
431
1230
1330
1360
837
4800
5660
2630
5750
3050
3160
3500
>10000
3730
9820
4320
8200
5540
2490
>10000
8550
>10000
3040
>10000
2330
2580
>10000
>10000
>10000
973
1325
1341
1295
1292
1340
1389
1413
1414
1421
1483
1511
1507
1497
1484
1481
1478
1471
1476
1481
1475
1470
1471
1485
1490
1528
1533
1565
1537
1495
99.11
52.9
2780
1485
74.60
98.40
99.20
85.70
98.70
99.10
99.80
99.90
99.90
99.80
99.60
98.80
99.00
99.50
99.30
99.50
99.90
99.90
99.90
99.70
5.83
38.3
21.1
22.7
35.3
34.6
46.2
56.5
43.0
37.8
43.6
36.3
21.7
27.0
18.9
24.6
28.3
24.9
22.5
20.7
66.5
681
144
90.9
429
3960
6770
7990
>10000
6690
4070
6970
>10000
8850
>10000
>10000
>10000
>10000
>10000
8880
841
1329
1322
1339
1416
1484
1526
1506
1495
1488
1482
1493
1492
1485
1474
1500
1496
1507
1510
1507
ST-45 muscovite Run #62B24m (J = 0.016265 wt. = 1.32mg)
600
625
650
675
700
725
750
770
790
810
830
850
860
870
880
890
900
910
920
930
950
975
1000
1025
1050
1075
1100
1125
1150
1250
47.64
69.51
69.96
66.84
65.82
82.40
88.52
74.32
74.04
73.98
78.65
80.79
80.41
79.70
78.54
78.48
78.29
77.91
77.95
78.67
78.02
77.82
77.77
78.82
79.02
82.20
82.61
86.08
83.88
80.56
0.0899
0.0247
0.0164
0.0161
0.0155
0.0263
0.0228
0.0124
0.0133
0.0118
0.0126
0.0125
0.0123
0.0110
0.0122
0.0114
0.0121
0.0117
0.0118
0.0131
0.0110
0.0116
0.0113
0.0126
0.0103
0.0132
0.0129
0.0096
0.0103
0.0110
0.0167
0.0084
0.0133
0.0066
0.0082
0.0194
0.0185
0.0041
0.0133
0.0200
0.0105
0.0075
0.0068
0.0061
0.0064
0.0078
0.0096
0.0058
0.0080
0.0070
0.0097
0.0150
0.0119
0.0115
0.0044
0.0070
0.0239
0.0148
0.0502
0.0940
1.236
0.955
0.714
0.773
0.495
4.959
5.824
0.402
0.289
0.088
0.074
0.049
0.047
0.059
0.022
0.069
0.081
0.137
0.036
0.144
0.086
0.138
0.105
0.071
0.024
0.086
0.082
0.383
0.420
0.425
43.96
66.67
67.83
64.53
64.33
67.73
71.29
73.11
73.16
73.70
78.41
80.62
80.25
79.50
78.45
78.25
78.03
77.48
77.82
78.22
77.74
77.39
77.44
78.58
78.93
81.93
82.35
84.92
82.62
79.29
Integrated 79.28
0.0131
0.0099
0.232
78.58
100
± 11
± 15
± 13
± 13
± 9
± 9
± 9
± 6
± 6
± 5
± 3
± 2
± 2
± 2
± 3
± 3
± 3
± 3
± 4
± 5
± 4
± 4
± 4
± 4
± 4
± 4
± 5
± 13
± 11
± 8
ST-45 muscovite Run #62B25m (J = 0.016270 wt. = 1.08mg)
600
650
700
750
800
825
850
860
870
880
890
900
930
960
1000
1020
1040
1050
1060
1070
48.97
68.06
67.04
79.02
74.21
79.18
81.94
80.27
79.44
78.89
78.63
80.18
79.90
78.94
78.28
80.12
79.41
80.20
80.84
80.51
0.0972
0.0191
0.0475
0.0754
0.0235
0.0125
0.0116
0.0115
0.0113
0.0116
0.0122
0.0121
0.0097
0.0116
0.0109
0.0078
0.0111
0.0109
0.0109
0.0115
0.0898
0.0136
0.0248
0.0230
0.0148
0.0151
0.0113
0.0093
0.0122
0.0138
0.0120
0.0144
0.0241
0.0193
0.0277
0.0213
0.0185
0.0210
0.0233
0.0252
4.205
0.379
0.189
3.836
0.315
0.237
0.052
0.030
0.040
0.047
0.100
0.328
0.273
0.128
0.185
0.142
0.012
0.010
0.013
0.084
36.52
66.92
66.46
67.66
73.26
78.46
81.76
80.16
79.30
78.73
78.31
79.19
79.07
78.54
77.71
79.68
79.36
80.24
80.45
80.24
0.49
0.59
1.19
1.98
2.83
6.85
10.02
8.98
6.88
5.54
10.49
1.46
1.12
1.17
2.01
1.87
2.54
2.02
1.82
1.60
± 30
± 18
± 10
± 8
± 6
± 3
± 2
± 3
± 3
± 3
± 3
± 8
± 11
± 10
± 7
± 7
± 6
± 7
± 7
± 8
1080
1120
1175
1250
1600
80.82
79.85
80.36
81.96
84.26
0.0107
0.0109
0.0109
0.0121
0.0116
0.0237
0.0260
0.0132
0.0186
0.0657
0.215
0.034
0.029
0.018
0.346
80.16
79.73
80.25
81.88
83.22
1.60
3.06
8.20
13.15
2.54
99.20
99.90
99.90
99.90
98.80
22.1
20.1
39.5
28.1
7.96
>10000
>10000
>10000
4110
>10000
1506
1500
1507
1528
1545
Integrated 79.73
0.0140
0.0173
0.187
79.16
100
99.28
30.2
1790
1493
182
990
810
635
1980
4880
6910
>10000
3920
>10000
4120
3220
3270
6380
4420
8570
6570
5640
9770
4760
7160
6290
8680
4980
3340
3540
2200
6340
1021
1304
1306
1367
1404
1419
1432
1458
1463
1474
1482
1486
1475
1487
1483
1466
1457
1448
1445
1443
1442
1453
1452
1455
1462
1465
1473
1312
3520
1451
94.5
102
677
3357
>10000
>10000
>10000
2520
7220
>10000
4190
3500
>10000
2950
8440
9220
6020
1030
1341
1375
1392
1381
1373
1371
1382
1406
1425
1431
1414
1389
1420
1419
1416
1415
±
±
±
±
±
8
5
3
2
6
ST-15 muscovite Run #62B10m (J = 0.016185 wt. = 1.30mg)
650
675
725
775
810
830
840
850
860
870
875
880
885
900
925
950
975
1000
1020
1040
1060
1085
1100
1130
1140
1175
1260
1600
51.55
67.35
67.71
111.3
75.30
74.83
75.50
76.77
77.85
78.29
79.15
79.20
78.53
79.26
78.92
77.71
77.04
76.28
76.16
76.11
75.91
76.81
76.63
76.60
77.42
77.51
78.31
66.61
0.0423
0.0172
0.0185
0.0452
0.0150
0.0124
0.0119
0.0112
0.0125
0.0109
0.0123
0.0125
0.0126
0.0117
0.0120
0.0115
0.0117
0.0118
0.0115
0.0121
0.0117
0.0118
0.0115
0.0118
0.0125
0.0123
0.0133
0.0119
0.0083
0.0084
0.0024
0.0089
0.0030
0.0007
0.0034
0.0037
0.0026
0.0010
0.0015
0.0013
0.0023
0.0013
0.0010
0.0015
0.0012
0.0017
0.0018
0.0034
0.0005
0.0047
0.0025
0.0019
0.0037
0.0015
0.0110
0.0029
1.530
0.616
0.683
13.94
0.845
0.298
0.199
0.029
0.212
0.063
0.140
0.059
0.125
0.059
0.026
0.064
0.072
0.056
0.104
0.124
0.083
0.106
0.068
0.056
0.089
0.029
0.084
0.163
47.01
65.51
65.67
70.05
72.78
73.92
74.89
76.82
77.20
78.08
78.71
79.00
78.13
79.06
78.82
77.50
76.80
76.10
75.83
75.72
75.64
76.47
76.40
76.61
77.13
77.40
78.04
66.10
0.42
0.77
0.86
0.98
1.57
2.40
2.05
1.95
1.63
1.50
1.95
2.25
2.23
3.08
5.87
6.29
5.54
4.66
3.66
3.23
3.25
3.37
4.95
3.99
4.48
8.23
14.94
3.89
91.20
97.30
97.00
63.00
96.70
98.80
99.20
99.90
99.20
99.80
99.50
99.80
99.50
99.80
99.90
99.80
99.70
99.80
99.60
99.50
99.70
99.60
99.70
99.90
99.70
99.90
99.70
99.30
63.0
62.6
223
59.0
176
785
156
143
201
523
344
409
229
393
541
340
429
304
299
154
1070
111
209
274
143
342
47.5
183
Integrated 77.03
0.0127
0.0035
0.245
76.28
100
99.03
149
0.88
2.50
1.69
1.38
1.67
2.64
2.53
2.36
3.15
5.85
7.68
4.90
4.56
4.55
4.44
4.97
4.86
77.50
65.30
90.00
100.00
98.50
99.20
99.30
99.10
99.20
99.50
99.80
99.60
99.60
99.70
99.70
99.60
99.70
± 15
± 9
± 9
± 13
± 6
± 4
± 5
± 4
± 5
± 5
± 5
± 4
± 4
± 3
± 3
± 3
± 3
± 3
± 3
± 4
± 3
± 3
± 3
± 3
± 3
± 2
± 4
± 3
ST-5 muscovite Run #57L44m (J = 0.014870 wt. = 1.20mg)
580
620
650
675
700
720
740
760
780
800
820
840
860
880
900
920
940
66.83
113.6
85.40
78.22
78.51
77.33
77.07
78.14
80.00
81.34
81.56
80.41
78.35
80.77
80.69
80.56
80.31
0.0756
0.0871
0.0239
0.0092
0.0119
0.0113
0.0113
0.0133
0.0119
0.0111
0.0121
0.0125
0.0113
0.0127
0.0116
0.0116
0.0118
0.0449
0.0335
0.0281
0.0145
0.0048
0.0163
0.0130
0.0144
0.0088
0.0019
0.0053
0.0063
0.0034
0.0138
0.0304
0.0180
0.0073
5.094
13.34
2.883
0.621
0.390
0.199
0.176
0.230
0.211
0.131
0.054
0.119
0.108
0.079
0.086
0.116
0.076
51.76
74.14
76.86
78.22
77.33
76.71
76.52
77.44
79.35
80.93
81.38
80.03
78.01
80.52
80.42
80.20
80.07
11.6
15.6
18.6
36.0
108
32.0
40.4
36.4
59.7
271
98.0
83.1
154
37.8
17.2
29.0
71.9
± 19
± 12
± 10
± 10
± 9
± 6
± 7
± 6
± 5
± 7
± 4
± 5
± 5
± 6
± 7
± 6
± 5
960
980
1000
1025
1050
1075
1100
1200
1350
80.90
81.64
82.40
83.05
81.01
86.66
87.65
86.06
92.79
0.0119
0.0117
0.0121
0.0123
0.0115
0.0117
0.0153
0.0180
0.0212
0.0044
0.0096
0.0053
0.0033
0.0055
0.0084
0.0423
0.1470
0.2268
0.088
0.101
0.060
0.076
0.042
0.139
0.806
1.881
3.756
80.62
81.32
82.19
82.81
80.86
86.23
85.25
80.50
81.70
5.22
5.95
7.08
9.09
7.13
3.44
0.69
0.49
0.30
99.70
99.60
99.80
99.70
99.80
99.50
97.30
93.60
88.10
119
54.6
99.4
157
94.8
62.3
12.4
3.56
2.31
5240
7360
4360
3850
8030
7320
1750
1400
1550
1421
1430
1441
1448
1424
1489
1477
1420
1435
± 5
± 7
± 4
± 4
± 13
± 6
± 19
± 26
± 41
Integrated 81.84
0.0146
0.0114
0.550
80.20
100
97.99
45.8
1900 1416
_________________________________________________________________________________________________
a Temperature in °C measured with a thermocouple on the outside of the Ta furnace crucible.
b The isotope ratios given are not corrected for Ca, K and Cl derived Ar isotopic interference but, 37Ar is corrected
for decay using a half-life of 35.1 days. The ratios are corrected for line blanks.
c F is the ratio of radiogenic 40Ar to K-derived 39Ar. It is corrected for atmospheric argon and other nuclear
reactions using the following factors:
(40Ar/36Ar)air
=
295.5
(38Ar/39Ar)
=
0.01185
(38Ar/37Ar)Ca
=
(36Ar/38Ar)
Cl
=
3.50 x 10-5
2.018 x 10-6 per day after irradiation.
(39Ar/37Ar)
Ca
K
=
=
=
=
(36Ar/37Ar)Ca
(40Ar/39Ar)K
=
=
=
=
=
=
=
=
6.630. x 10-4
6.630 x 10-4
6.715 x 10-4
6.836 x 10-4
2.372. x 10-4
2.372 x 10-4
2.643 x 10-4
3.116 x 10-4
0.02516
0.02516
0.02422
0.03039
for run numbers starting with 55
for run numbers starting with 57
for run numbers starting with 62
for run numbers starting with 71
for run numbers starting with 55
for run numbers starting with 57
for run numbers starting with 62
for run numbers starting with 71
for run numbers starting with 55
for run numbers starting with 57
for run numbers starting with 62
for run numbers starting with 71
d Relative percent of the total 39Ar released in the fraction.
e Percent of the total 40Ar in the fraction that is radiogenic.
f Weight ratio calculated using the relationship: K/Ca = 0.523 x (39Ar K/37Ar Ca).
g Weight ratio calculated using the relationship: K/Cl = 5.22 x (39Ar K/38ArCl).
h Ages calculated with a total decay constant of 5.543 x 10-10 y-1. “Integrated” indicates the calculated values for all
fractions combined. All uncertainties are given at the 1-sigma level. For increments of a step-heating analysis, the
uncertainties do not include any J value uncertainty. An age plateau is defined as contiguous fractions constituting a
majority (>50%) of the 39Ar released where the apparent-age variations among fractions may be accounted for with
analytical uncertainties. A plateau encompasses as many fractions as possible (except where fraction uncertainties
are very large) where ages agree with the plateau within their ± 2-sigma uncertainties. Where this strict definition is
not observed and variation among "plateau" fractions is minor but still exceeds analytical uncertainties, an
approximate or "near" plateau is defined. In these cases, the indicated "plateau" age is enclosed in quotation
marks. For the plateau age, the uncertainty reflects a relative uncertainty of ± 0.25% in J value. An overall
systematic uncertainty of ± 1% assigned to all ages to allow for uncertainty in the monitor age. The monitor used
was a intralaboratory biotite standard (“AL-1”) that has a 40Ar/39Ar age of 443.5 Ma; an uncertainty of ± 1% is
assigned to this age in order to allow for uncertainties in the standards against which AL-1 was calibrated. The age
for this monitor was determined by simultaneous cross calibration with several monitors including the Fish Canyon
Tuff biotite standard (FCT-3) with an age of 27.84 Ma.
_________________________________________________________________________________________________