PRACNÝ, Pavel, Jiří FAIMON, Dalibor VŠIANSKÝ a Ludvík KABELKA. Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions. Aquatic Geochemistry. New York: Springer, 2017, roč. 23, č. 2, s. 119-139. ISSN 1380-6165. doi:10.1007/s10498-017-9313-y.
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Základní údaje
Originální název Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions
Autoři PRACNÝ, Pavel (203 Česká republika, garant, domácí), Jiří FAIMON (203 Česká republika, domácí), Dalibor VŠIANSKÝ (203 Česká republika, domácí) a Ludvík KABELKA (203 Česká republika).
Vydání Aquatic Geochemistry, New York, Springer, 2017, 1380-6165.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 10505 Geology
Stát vydavatele Nizozemsko
Utajení není předmětem státního či obchodního tajemství
WWW Článek na webu vydavatele
Impakt faktor Impact factor: 1.418
Kód RIV RIV/00216224:14310/17:00096253
Organizační jednotka Přírodovědecká fakulta
Doi http://dx.doi.org/10.1007/s10498-017-9313-y
UT WoS 000399092500004
Klíčová slova anglicky Moravian Karst; Limestone dissolution; Kinetic model; Cave dripwater; Mg-calcite
Štítky kras, model, NZ, rivok, skapové vody
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnila: Ing. Nicole Zrilić, učo 240776. Změněno: 3. 4. 2018 15:17.
Anotace
The Mg/Ca ratios in karst water are generally believed to comprise information on climate and, being encoded in speleothems, they are utilized as paleoenvironmental proxy. However, the mechanism and dynamic of Mg release from limestone during dissolution is not well understood. A theoretical evolution of the Mg/Ca ratios during limestone dissolution under epikarstic conditions (T = 10 °C, logPCO2 = –1.5) was studied via a dynamic model. The results were compared with (1) the dripwater data set collected in Punkva Caves (Moravian Karst, Czech Republic) during one-year period and (2) the published data from various locations worldwide. The modeling showed that the Mg/Ca ratios are governed by composition of Mg-calcite present in limestone. Two distinct stages in the dissolution dynamics were recognized: (1) an initial congruent dissolution with stoichiometric release of Ca and Mg and, subsequently, (2) an incongruent dissolution demonstrated by the gradual release of Mg with simultaneous Ca decrease via calcite precipitation. Additional identified factors influencing the reaction path and Mg/Ca ratio evolution were the dolomitic component of limestone and the ratio of limestone/solution boundary area to water volume. Finally, the water-rock interaction time controls the resulting Mg/Ca ratio in dripwater determining how far the dissolution proceeds along the reaction path. Thus, the study results indicate that Mg/Ca ratio depends on many factors in addition to climatic variables.
VytisknoutZobrazeno: 22. 4. 2021 01:04