tivity on the carmel faul

Sample name 230/238 err 234/238 err 232/238 err 230/232 err Det. Age (y) + - Type
DN-51 pre I 0.71323 0.00332 1.01478 0.00186 0.081740 0.000223 8.84 0.04 y 131346 1171 1158 A
DN-33c2-post 0.75605 0.00532 1.05619 0.00251 0.018440 0.000043 41.70 0.27 134388 1848 1814 A
DN-46 pre I 0.74462 0.00283 1.03657 0.00146 0.032753 0.000095 22.99 0.10 y 136133 1017 1008 A
DN-25 post I 0.69775 0.03377 0.97948 0.00241 0.063813 0.002499 11.03 0.69 136503 14315 12605 D
DN-66b-pre 0.72708 0.03068 1.00470 0.00290 0.123950 0.002547 9.08 0.42 y 139648 12826 11444 E
230
Th/U Age = 137 ±29 ka
data-point error ellipses are 2σ
Initial 234 U/ 238 U = 1.085 ±0.067
MSWD = 179, probability = 0.000
1.12
1.08
234 U/
238 U
1.04
1.00
0.96
0.64 0.68 0.72 0.76 0.80 0.84
230
Th/ 238 U
Figure 32: 137ka 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 crosses- projected
data points). 3. Distribution of cluster samples in Denya Cave (red dots).
A cluster of ages at ca. 137ka is shown in Figure 32. This age is based on five pre-
and post-seismite samples from around the upper chamber of the cave, three of which are
type A speleo-seismites (Fig. 33). The large error of the calculated age could be attributed
A-3
to the large error of some of
D-2
the individual samples (due
to a low accuracy of
dating). Nevertheless, the
post I
136.5ka
DN-46
pre I
136.13ka
A-2
isochron calculation yielded
a very large error, therefore
it is noted as an event
Seismic contact
post
134.38ka
pre
139.65ka
which was recorded at the
time interval between ca.
110 and 170ka.
A-2
DN-33c2
E-1
pre I
(maybe post)
131.35ka
DN-51
Figure 33: Age cluster ~137ka
samples.
62