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Climatic Change: The Karst Record. Karst Waters Institute
Special Publication2. (1996). ISBN 0-9640258-1-7a Conference held
at The Department of Geology, University ofBergen, Norway, August
1-4th 1996 .
SPELEOTHEM LUMINESCENCE PROXY RECORDS OF ANNUAL
RAINFALL IN THE PAST EVIDENCES FOR "THE DELUGE" IN
SPELEOTHEMS
by Y.Y.Shopov, L.Tsankov, L.N.Georgiev, A.Damyanova, Y.
Damyanov, E. Marinova-
Section Speleology & Faculty of Physics, University of
Sofia, James Baucher 5, Sofia 1126,Bulgaria. E-mail:
[email protected]
D.C. Ford-Geography Dept., McMaster University, Hamilton,
Ontario, L8S lK4, Canada
C.J.Yonge, W. MacDonald, H.P.R.Krouse- Dept. of Physics,
University of Calgary,
Calgary, Alberta, Canada
Speleothem growth rate variations represent mainly rainfall
variations. Speleothem luminescence
visualizes annual microbanding we used to derive proxy records
of annual precipitations for the cave site. Incase of Rats Nest
cave, Alberta, Canada we obtained good correlation (correlation
coefficient of 0.57)
between annual precipitations (from Banff station 50 km north of
the cave) and annual growth rate of thespeleothem (Fig. 1). We used
obtained regression coefficients to reconstruct annual
precipitations for last 280
years at the cave site with estimated error of 80 mm/ year.
Annual speleothem growth rate was not dependent
on intensly of luminescence, on annual temperature and solar
luminosity for the same time span (zero
correlation).
Fig.1 (Up) Annual growth rate of a stalagmite from Rats Nest
cave, Alberta, Canada
(Down) Annual precipitations (from August to August) for Banff
station, 50 km north of the cave
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By "tuning" of the time scale of a luminescent record with a
geomagnetic dipole intensity record(Mazaud et al., 1991) we
obtained a reconstruction of growth rates and precipitations in
Bosnek karst region
near Duhlata cave, Bulgaria for the last 50000 years (Fig.2).
This record show a very prominent peak at7000- 8000 years B.P.,
when annual growth rate was over 53 times higher than today.
Considering that cave
site is located in the place of the oldest civilizations
(Mediterranean basin) this event can be related to the
Bibles "Deluge". The age of the recorded event is about the age
of "The Creation of the world". The duration
of the recorded event is of several hundreds years, because of
the low resolution of the record. In case that the
real flood happened for a short time span it suggests enormous
rainfall. Present day precipitation at the cave
site is 685mm/yr. This speleothem was dated with 8 TAMS 14C
dates.
By "tuning" of the time scale of a luminescent record with the
calibration 14C record (Stuiver and Kra,1986) we obtained a
reconstruction of growth rates and precipitations for the last 6400
years with averaged
time step of 41 years for Iowa, near Cold Water cave, US
(fig.2). It suggests higher speleothem growth rate
and higher precipitations between 6400- 2500 years B.P. at the
cave site. This speleothem was dated with 7
AMS U/Th dates.
Fig.2. (Up) Reconstruction of growth rates (proxy of
precipitations) of a flowstone from Duhlata cave,
Bulgaria for the last 50000 years;
(Down) Reconstruction of growth rates (proxy of precipitations)
for the last 6400 years with averaged
time step of 41 years for Cold Water cave, Iowa, US
