Geoscience Reference
In-Depth Information
Fig. 3.52
K. Kostov is
sampling the base of a 26 cm
high stalagmite deposited on
inclined one (photo
V. Nikolov)
The extracted samples were named as follows:
• Yamata1: Core from the base of a small vertical
stalagmite with height of 10 cm, deposited on the
fallen massive stalagmite 1.4 m long;
• Yamata2: Core from the top of the fallen massive
stalagmite with height of 1.4 m, in order to deter-
mine the time interval in which the seismotectonic
event occured;
• Yamata3: Core from the base of 26 cm high ver-
tical stalagmite deposited on massive inclined sta-
lagmite with height of 1.7 m (Fig.
3.51
);
• Yamata4. Core of thick calcite crust covering the
top
of
the
flattened
''hanging''
stalagmite—
paleoseismic phenomenon.
Samples were sent to Dr. Gergely Surányi from the
radiometric laboratory at the ELTE University in
Budapest. The dating was performed by the method of
uranium series plasma mass spectrometry (ICP) using
plasma ICP-MS spectrometer (Thermo Corp.,
Germany) at the Institute for isotope studies of the
Hungarian Academy of Sciences.
The obtained ages are :
• Yamata1:
Fig. 3.53
Rose-diagram
of
the
directions
of
51
deformed
speleothems in Yamata Cave
results will be carried out in comparison with the data
from the Shepran Cave located nearby.
In 2007 samples from deformed speleothems were
taken for U-series dating. The dating samples were
obtained using an electric drill with a steel core barrel
COMET M42 (Coronas Bimetal, Spain). The diame-
ter of the taken cores was 12 mm of weight 4-5 g.
48,200 years
(lower
limit—49,300,
upper limit—47 100 years);
• Yamata2: [300,000 years
(the
large
amount
of
clay
components
in
the
sample
do
not
permit
accurate analysis and calibration of age);
