tivity on the carmel faul

Sample name 230/238 err 234/238 err 232/238 err 230/232 err Det. Age (y) + - Type
DN-68b-pre 0.30810 0.00845 1.07626 0.00493 0.008858 0.000055 43.68 1.19 36522 1185 1171 C
DN-47 post I 0.30987 0.00280 1.06773 0.00153 0.004028 0.000014 78.61 0.74 n 37136 398 396 A
DN-44 post 0.32161 0.00320 1.07758 0.00301 0.000935 0.000005 354.47 3.62 n 38375 444 442 A
DN-44 pre 0.32054 0.00497 1.06962 0.00277 0.006032 0.000025 55.00 0.86 38577 707 708 A
DN-63-pre II 0.32737 0.00198 1.07924 0.00052 0.001445 0.000004 230.39 1.50 n 39122 283 283 A
DN-36 pre III 0.35427 0.00197 1.08074 0.00157 0.018083 0.000047 19.92 0.11 y 42965 285 285 E
DN-33C1-PRE 0.34182 0.01337 1.03957 0.00231 0.023024 0.000194 15.32 0.61 n 43241 2094 2055 A
DN-52 post 0.35542 0.00436 1.07331 0.00247 0.006495 0.000021 55.90 0.68 n 43519 652 647 A
230
Th/U Age = 38.0 ±2.7 ka
1.12
data-point error ellipses are 2σ
Initial 234 U/ 238 U = 1.089 ±0.028
MSWD = 105, probability = 0.000
1.10
234 U/
238 U
1.08
1.06
1.04
1.02
0.27 0.29 0.31 0.33 0.35 0.37
230 Th/ 238 U
Figure 28: 38ka sample age cluster; 1. Sample isotopic ratio data table (red-pre samples, black-post
samples). 2. Isochron plot and age calculation (red crosses-uncorrected ages, green crossesprojected
data points). 3. Distribution of cluster samples in Denya Cave (red dots).
post
38.37ka
A cluster of ages at ca. 38ka is shown in Figure 28. This age is based on six pre- and
DN-63
pre II
39.12ka
pre
38.58ka
post I
37.14ka
pre
43.24ka
A-4
A-5
A-2
DN-33c-1
pre
36.52ka
post
43.52ka
C-1
DN-52
post-seismite samples from around
the upper chamber of the cave, four
of which are type A seismite samples
(Fig. 29). The age calculation of the
isochron is approximately the same
as the uncorrected ages of samples
DN-44 pre and post, which constrain
the age of the seismic event very
accurately, even though the isochron
seems highly scattered. The two other
samples in this cluster can be viewed
as corroborative evidence.
A-4
DN-44
A-3
Figure 29: Age cluster ~38ka samples.
60