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Chlorine Isotopes

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Encyclopedia of Geochemistry

Part of the book series: Encyclopedia of Earth Sciences Series ((EESS))

Introduction

Chlorine has 24 isotopes with mass numbers ranging from 28Cl to 51Cl. There are only two stable isotopes: 35Cl and 37Cl with respective proportions of 75.76% and 24.24% (Berglund and Wieser 2011). The longest-lived radioactive isotope is 36Cl (half-life of 301,000 years); all other isotopes having half-lives of less than 1 h. Variations of the chlorine isotope ratio (R = 37Cl/35Cl) are expressed in the δ-notation with \( {\updelta}^{37}\mathrm{Cl}={\left({\mathrm{R}}_{\mathrm{sample}}/{\mathrm{R}}_{\mathrm{standard}}\hbox{--} 1\right)}^{\ast }1000 \). The international reference standard for chlorine is the terrestrial ocean Standard Mean Ocean Chloride (SMOC), with δ37Cl = 0 ‰ (Godon et al. 2004a; Kaufmann et al. 1984).

History and Overview

Chlorine undergoes volatile and incompatible behavior during silicate melting and is water soluble. For these reasons, geological processes (including partial melting, magma degassing, hydrothermal activity, and weathering) have mostly...

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Correspondence to Magali Bonifacie .

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Bonifacie, M. (2018). Chlorine Isotopes. In: White, W.M. (eds) Encyclopedia of Geochemistry. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-39312-4_90

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