Mikrokorozija stalagmita v jami Küpeli v južni Turčiji
DOI:
https://doi.org/10.3986/ac.v51i2.10589Ključne besede:
Cave, speleothem, stalagmite, micro karstification, dissolution, mineralogy, micro crystal fabricPovzetek
V članku obravnavamo mikrokorozijo, ki ob raztapljanju tvori številne oblike stalagmita v jami Küpeli v južni Turčiji. Korozija je posledica jamske vode, ki se v tleh in epikrasu, v nekaterih razmerah pa tudi v jamski etmosferi, obogati s CO2 in pronica v stalagmit. Postavili smo domnevo, da je voda s predhodne površine stalagmita v notranjost prodrla po navpičnih ali diagonalnih porah v obliki zarez, ki so nastale s korozivnim širjenjem medkristalnih por. Te malce podolgovate pore so v stalagmitu naključno nastajale ob ponavljajočih se razmerah v različnih fazah rasti stalagmita in segajo v nekaj zadnjih makroskopskih rastnih plasti (laminarni tok pod mikroskopom) pod nekdanjo površino, to pa je pozneje prekrila novonastala rastna plast sige. Pozneje, ko je ta voda dosegla razmeroma bolj prepustne površine rastne plasti, je pronicala vzdolž teh por in nastale so raznovrstne korozijske oblike. Med raznovrstnimi mikrokorozijskimi oblikami so jamice in vdolbinice, zaobljene in povečane kristalne meje, medkristalne pore in nanometrski kristalni skupki, nastali ob razpadu razmeroma velikih kristalov (≥ 4 μm). V korozijskih porah se je iz pronicajoče vode, prenasičene s kalcijevim karbonatom v stalagmitu, znova izločal kalcit, in to na robovih por ali kot njihovo polnilo. V ponavljajočih se razmerah je to ponovno izločanje kalcita v stalagmitu sledilo koroziji, verjetno zaradi sezonskega spreminjanja vsebnosti CO2 in CaCO3 v vodi na epikraškem območju in v stalagmitu.
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- 2023-03-08 (3)
- 2023-03-08 (2)
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