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VIII
Tab. A3 continued
Sample Mineral J Weight
(mg)
GS
(�m)
TFA
(Ma)
WMA
(Ma)
IA
(Ma)
MSWD 40 Ar/ 36 Ar % 39 Ar
used
Cenozoic reactivation phase (continued)
Pa5360 bio 0.004514 1.8 125-250 15.7 ± 0.2 15.7 ± 0.2 15.7 ± 0.2 0.2/3 299 39
Pa5360 kfs-lov 0.004471 6.5 15.5 ± 0.15 15.4 ± 0.15 15.5 ± 0.16 1.6/1.7 295 ± 1 93
96A6c bio 0.0007328 2.2 15.4 ± 0.05 15.3 ± 0.05 15.3 ± 0.05 1/2.6 296 ± 3 90
96A11d bio 0.0007357 7 125-250 16.4 ± 0.1 16.1 ± 0.1 16.1 ± 0.2 0.67/2.1 337 100
A96A5i mus 0.0007398 5 15.7 ± 0.1 15.7 ± 0.05 15.7 ± 0.05 3.8/2.6 295 ± 2 62
A96A5k bio 0.0007435 5.9 15.5 ± 0.1 15.7 ± 0.05 15.7 ± 0.06 6.6/1.7 302 ± 7 86
A96A5k mus 0.0007452 2.7 15.8 ± 0.1 15.8 ± 0.05 15.7 ± 0.08 2.1/2.3 306 ± 7 84
L96A11a mus 0.0007365 7 15.5 ± 0.1 15.4 ± 0.05 15.4 ± 0.1 69/1.8 298 ± 4 96
M96A8e bio 0.0007501 3.5 13.5 ± 0.1 13.5 ± 0.1 13.3 ± 0.1 31/1.6 315 ± 7 98
96Ak2c bio 0.0007138 4.8 15.8 ± 0.1 15.9 ± 0.1 15.8 ± 0.1 3.1/2.4 314 ± 7 99
96Ak3f hbl 0.0007232 16.6 18.3 ± 0.1 18.7 ± 0.06 18.7 ± 0.07 5.5/2.4 297 ± 3 80
96M9c hbl-low-T 0.0006875 3.6 54.2 ± 0.2 16.6 ± 0.5 6
16.6 ± 1.2 0.9/3 338 ± 6 10
96M9c hbl-mid-T 0.0006875 3.6 54.2 ± 0.2 29.0 ± 0.2 7
28.9 ± 0.6 3.6/3 392 ± 6 35
96M10a bio 0.0006899 2.2 14.4 ± 0.5 14.7 ± 0.3 8
14.7 ± 0.4 0.7/2.3 428 ± 56 96
96M11b bio 0.0006914 1 63-125 16.1 ± 0.2 15.4 ± 0.3 15.4 ± 0.5 0.52/2.3 616 100
96M16d hbl-mid-T 0.0006927 25.5 156.1± 0.5 23.9 ± 0.3 9 23.8 ± 1.2 2.8/3.8 466 7
L96M21a hbl 0.0006978 5.9 17 ± 0.1 15.9 ± 0.05 10 15.9 ± 0.07 1.6/1.9 313 ± 6 76
L96M18c bio 0.0007026 4.2 19.2 ± 0.1 18.8 ± 0.1 18.8 ± 0.2 5/2.7 295 ± 3 93
96S6c hbl-low-T 0.0007531 6.4 19.5 ± 0.1 15.7 ± 0.2 17.2 ± 0.8 4.4/2.3 292 ± 2 25
96S6c hbl-high-T 0.0007531 6.4 19.5 ± 0.1 20.5 ± 0.1 19.6 ± 0.4 11.3/2.3 310 ± 5 59
96S6d hbl 0.0007544 26 17.3 ± 0.1 18.2 ± 0.1 18.6 ± 0.2 6.4/1.7 285 ± 2 99
Central Pamirian basalts
A96M31b wrb 0.0007853 31.7 24.4 ± 0.1 19.5 ± 0.1 20.6 ± 1.0 42/2.5 292 ± 4 81
L96M7b wrb 0.0007819 60.2 20.3 ± 0.1 20.4 ± 0.1 20.2 ± 0.15 13/1.6 297 ± 1 92
L96M27a wrb 0.0007048 20.1 37.1 ± 8.5 22.6 ± 8.7 11 31.2 ± 14 38037 295 ± 2 32
A96S2d wrb 0.0007709 29.3 19.3 ± 0.2 18.0 ± 0.2 25.1 ± 1.4 4.8/1.8 282 ± 3 92
J is the irradiation parameter; MSWD is the mean square weighted deviation (Wendt and Carl 1991), which expresses the
goodness of fit of the isochron (Roddick 1978); isochron and weighted mean ages are based on fraction of 39 Ar listed in
the last column. Abbreviations are as follows: TFA, total fusion age; WMA, weighted mean age; IA, isochrone age; bio,
biotite; mus, K-white mica; hbl, hornblende; wrb, whole rock basalt; na, not analysed. Italics: weighted mean plateau
age; bold: preferred are interpretation.
1 Weighted mean age recalculated with 40 Ar/ 36 Ar of 279; 2 Weighted mean age recalculated with 40 Ar/ 36 Ar of 503,
youngest steps down to ~40 Ma, possibly homogenously distributed excess 40 Ar; 3 Highest temperature step at ~354 Ma;
4 Weighted mean age recalculated with 40 Ar/ 36 Ar of 436; 5 Weighted mean age recalculated with 40 Ar/ 36 Ar of 339;
6 Weighted mean age recalculated with 40 Ar/ 36 Ar of 338; 7 Weighted mean age recalculated with 40 Ar/ 36 Ar of 392;
8 Weighted mean age recalculated with 40 Ar/ 36 Ar of 428, 9 Weighted mean age recalculated with 40 Ar/ 36 Ar of 466,
preferred age interpretation 23 ± 5 Ma; 10 Weighted mean age recalculated with 40 Ar/ 36 Ar of 313; 11 Preferred age
interpretation 25 ± 10 Ma. Data were provided by L. Ratschbacher.