Experimental constraints on the stable-isotope systematics of CO2 ice/vapor systems and relevance to the study of Mars

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doi: 10.1016/S0016-7037(99)00327-0
Authors:Eiler, John M.; Kitchen, Nami; Rahn, Thom A.
Author Affiliations:Primary:
California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 64(4), p.733-746. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:2000
Note:In English. 60 refs.; illus., incl. 2 tables
Summary:The results are presented of isotopic fractionations of C and O2 between CO2 ice and vapour at 130-170 K based on the fractionations of 18O/16O and 13C/12C ratios at conditions relevant to the present near-surface on Mars. The results indicate that CO2 vapour is 18O-depleted with respect to CO2 ice, and thus isotope partitioning for CO2 appears to follow the normal behaviour in which the translational and/or internal partition function dominates isotopic fractionation. O-isotope fractionations generated by cycles of condensation and sublimation of CO2 on Mars may be similar in size to those generated by condensation and evaporation in the Earth's water cycle; C isotope fractionations are expected to be insignificant, and these variations are within the precision of direct measurements of the Martian atmosphere. The Martian and terrestrial atmospheres are similar to within 25-100% in 18O/16O and 13C/12C ratios. [R.K.H.]
Sections:Experimental mineralogy
Subjects:Applications; C-13/C-12; Carbon; Carbon dioxide; Condensation; Experimental studies; Gaseous phase; Geochemistry; Hydrology; Ice; Instruments; Isotope fractionation; Isotope ratios; Isotopes; Laboratory studies; Mars; O-18/O-16; Oxygen; Phase equilibria; Planets; Stable isotopes; Sublimation; Terrestrial planets; Water vapor
Abstract Numbers:00M/3712
Record ID:2000023410
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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