Evolution of Mg/Ca Ratios During Limestone Dissolution Under
Epikarstic Conditions

J 2017

Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions

PRACNÝ, Pavel, Jiří FAIMON, Dalibor VŠIANSKÝ and Ludvík KABELKA

Basic information

Original name

Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions

Authors

PRACNÝ, Pavel (203 Czech Republic, guarantor, belonging to the institution), Jiří FAIMON (203 Czech Republic, belonging to the institution), Dalibor VŠIANSKÝ (203 Czech Republic, belonging to the institution) and Ludvík KABELKA (203 Czech Republic)

Edition

Aquatic Geochemistry, New York, Springer, 2017, 1380-6165

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10505 Geology

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Článek na webu vydavatele

Impact factor

Impact factor: 1.418

RIV identification code

RIV/00216224:14310/17:00096253

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1007/s10498-017-9313-y

UT WoS

000399092500004

Keywords in English

Moravian Karst; Limestone dissolution; Kinetic model; Cave dripwater; Mg-calcite

Abstract

V originále

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.

Citovat

PRACNÝ, Pavel, Jiří FAIMON, Dalibor VŠIANSKÝ and Ludvík KABELKA. Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions. Aquatic Geochemistry. New York: Springer, 2017, vol. 23, No 2, p. 119-139. ISSN 1380-6165. Available from: https://dx.doi.org/10.1007/s10498-017-9313-y.

@article{1374791,
   author = {Pracný, Pavel and Faimon, Jiří and Všianský, Dalibor and Kabelka, Ludvík},
   article_location = {New York},
   article_number = {2},
   doi = {http://dx.doi.org/10.1007/s10498-017-9313-y},
   keywords = {Moravian Karst; Limestone dissolution; Kinetic model; Cave dripwater; Mg-calcite},
   language = {eng},
   issn = {1380-6165},
   journal = {Aquatic Geochemistry},
   title = {Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions},
   url = {https://link.springer.com/article/10.1007/s10498-017-9313-y},
   volume = {23},
   year = {2017}
}

TY  - JOUR
ID  - 1374791
AU  - Pracný, Pavel - Faimon, Jiří - Všianský, Dalibor - Kabelka, Ludvík
PY  - 2017
TI  - Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions
JF  - Aquatic Geochemistry
VL  - 23
IS  - 2
SP  - 119-139
EP  - 119-139
PB  - Springer
SN  - 13806165
KW  - Moravian Karst
KW  - Limestone dissolution
KW  - Kinetic model
KW  - Cave dripwater
KW  - Mg-calcite
UR  - https://link.springer.com/article/10.1007/s10498-017-9313-y
L2  - https://link.springer.com/article/10.1007/s10498-017-9313-y
N2  - 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.
ER  -

PRACNÝ, Pavel, Jiří FAIMON, Dalibor VŠIANSKÝ and Ludvík KABELKA. Evolution of Mg/Ca Ratios During Limestone Dissolution Under Epikarstic Conditions. \textit{Aquatic Geochemistry}. New York: Springer, 2017, vol.~23, No~2, p.~119-139. ISSN~1380-6165. Available from: https://dx.doi.org/10.1007/s10498-017-9313-y.

Detailed Information on Publication Record