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Formation of 13C/12C Isotope Ratios in Speleothems: A Semi-Dynamic Model1

Published online by Cambridge University Press:  18 July 2016

Marek Dulinski  and
Kazimierz Rozanski
Marek Dulinski
Affiliation:
Institute of Physics and Nuclear Techniques, Academy of Mining and Metallurgy, Krakow, Poland
Kazimierz Rozanski
Affiliation:
Isotope Hydrology Section, IAEA, Vienna, Austria
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Abstract

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A theoretical approach towards predicting the carbon isotope composition of carbonate cave deposits is presented. The proposed model simulates time variations of both the chemical and isotopic composition of the carbonate solution and deposited calcite in the course of CaCO3 precipitation. Two phases of the precipitation process are distinguished and treated separately: initial outgassing of the solution until a certain degree of supersaturation of CO32- ions is reached and subsequent precipitation of CaCO3 related to further outgassing. Precipitation rates of CaCO3 predicted by the model agree fairly well with literature data. The model predicts δ13C values of deposited calcite within a range of ca −16 to +3‰ depending on temperature, chemical and isotope parameters of the initial solution and actual degree of the precipitation process.

Type
Articles
Information
Radiocarbon , Volume 32 , Issue 1 , 1990 , pp. 7 - 16
Copyright
Copyright © 1990 The American Journal of Science 

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