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[EN] Travertine cascades
at Bešenová
are located north of the municipality. The
constant flow of mineral water over the cascades provides a
wonderful shine on the surface.
Travertine is a sedimentary rock. It is a natural chemical
precipitate of carbonate minerals, often recrystallized to calcite;
which is deposited from the water of mineral springs (especially
hot springs) or streams saturated with calcium carbonate. When
carbon dioxide-rich water percolates through rocks in limestone
areas, the water dissolves the limestone and becomes saturated with
it. When the water resurfaces later, the sudden drop in pressure
and the change in temperature cause the water to release the carbon
dioxide gas, much like fizzy drinks. The calcium carbonate then
recrystallizes, often over minute underwater plants.
If pure, the travertines
are white containing calcite almost exclusively. However,
travertines mostly come in many colours which is the result of iron
components or other organic impurities. The mineral waters of
Besenova contains calcium, magnesium, potassium, iron, manganese, a
big amount of sulphates, bicarbonates, free carbon dioxide, and
other minerals causing its characteristic reddish and brown
colour.
To claim your
"found" log on this cache, you need to:
- Attach a picture of yourself with
your GPS (or just your GPS) with the cascade in the
background
- Count the number of mineral
springs in the proximity of 100 meters from the cache
coordinates and send me the number via e-mail.
- Explain the chemical mechanism of
calcite dissolution and recrystalization by your words. (The brave
ones can send me also the formula describing the chemical reaction
 )
Please send me your the e-mail via
profile BEFORE you log the cache. Thank you.
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[SK] Travertín je druh vápenca,
vznikajúceho vyzrážaním z
sladkovodných minerálnych, prípadne
termálnych pramenov. Travertínove útvary
sú biele, pokial obsahujú cistý kalcit alebo
aragonit. Castejšie však obsahujú rozne
prímesi, ktoré mení ich farbu na rozne odtiene
cervenohnedej. Minerálna voda u Bešenovej okrem
vápnika obsahuje aj horcík, sodík,
draslík, železo, mangán, draslík,
mimoriadne množstvo síranov, bikarbonáty,
volný kyslicník uhlicitý a dalšie
minerály. Svojou neobycajnou rozmanitostou patria
bešenovské travertiny
k najzaujímavejším pramenistým
útvarom v Európe.
Pre zalogovanie tejto cache je
treba:
- Priložit k logu fotografiu
vás s GPS (samotári možu len GPS s
citatelnými súradnicami) na pozadi
kaskad.
- Zrátat pocet minerálných pramenov v
okolí 100 metrov od súradnic cache a poslat
e-mailom.
- Cez e-mail vlastnými slovami vysvetlit
chemický mechanizmus rozpúštania a
znovuzrážania vápenca. (Nepovinne možete
zaslat aj vzorec reakcie a podmienky, za ktorych
dochádza k rozpúštaniu alebo
zrážaniu. )
Prosím, odošlite vaš e-mal s
odpovedmi PRED zalogovanim cache. Dakujem.
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