Stable Isotope Composition of Recent Cave Calcite Precipitates and its Relation to Dic in Drip Water From Postojna Cave, Slovenia (CROSBI ID 597826)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa
Podaci o odgovornosti
Mandić, Magda ; Krajcar Bronić, Ines ; Mihevc Andrej ; Leis, Albrecht
engleski
Stable Isotope Composition of Recent Cave Calcite Precipitates and its Relation to Dic in Drip Water From Postojna Cave, Slovenia
Modern approach to the application of stalagmites for paleoclimate investigation recommends first studies of younger actively growing samples as well as cave drip water and cave environment monitoring undertaken for at least one climatic year. In the period from March 2010 to April 2011 such program has been performed in Postojna Cave. Environmental parameters (air and water temperature, pCO2 and geochemical parameters of drip water) have been monitored and stable isotopic composition (13C and 18O) of water and recent (soda straw and carbonate precipitated on watch glasses) has been determined, as well as stable isotopic composition of old carbonates. Monitoring has been performed on nine locations along the longitudinal profile of Postojna cave. Locations were chosen in order to cover different conditions of cave environment. Drip rate has been measured at each site. Glass plates were exposed for eight months at each location for recent carbonate precipitate sampling. The analysis of carbon (13C) and oxygen (18O) isotope ratios from cave drip water and fresh calcite precipitates from watch glasses has been done. Here we present the obtained results. The 13C values of carbonates precipitated on watch glasses are close to the corresponding 13CDIC values (≈-12 to -13 ‰). The values of 13C for “soda straws” vary from -7.84 ‰ to -10.58 ‰. The 13C of DIC and carbonates precipitated on watch glasses at location 05 – Podrti kapnik, -9.90 ‰ and -9.95 ‰, respectively, differ significantly from the corresponding data at other locations. The reason of such behavior could be in assumed prior calcite precipitation (PCP). The highest 18O value of soda straw samples is -4.84 ‰ and the lowest is -7.84 ‰. The 18O values of carbonates precipitated on watch glasses range from -3.07 ‰ to -4.67 ‰. The 18O values of carbonates on watch glasses are therefore more positive/less negative than 18O of “soda straws”.
speleothems; monitoring; cave environment; carbonate precipitates PCP
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Podaci o prilogu
88-88.
2013.
objavljeno
Podaci o matičnoj publikaciji
Abstracts
Otoničar, Bojan ; Gostinčar, Petra ; Gabrovšek, Franci
Postojna: Znanstvenoraziskovalni center SAZU, Inštitut za raziskovanje krasa ZRC SAZU = Karst Research Institute at ZRC SAZU
Podaci o skupu
21st International Karstological School "Classical Karst" : Hypogene Speleogenesis (between theory and reality...)
poster
10.06.2013-14.06.2013
Postojna, Slovenija