Mass-independent isotope effects in planetary atmospheres and the early solar system |
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Authors: | MH Thiemens |
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Affiliation: | Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0356, USA. mht@chem.ucsd.edu |
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Abstract: | A class of isotope effects that alters isotope ratios on a mass-independent basis provides a tool for studying a wide range of processes in atmospheres of Earth and other planets as well as early processes in the solar nebula. The mechanism for the effect remains uncertain. Mass-independent isotopic compositions have been observed in O3, CO2, N2O, and CO in Earth's atmosphere and in carbonate from a martian meteorite, which suggests a role for mass-independent processes in the atmosphere of Mars. Observed mass-independent meteoritic oxygen and sulfur isotopic compositions may derive from chemical processes in the presolar nebula, and their distributions could provide insight into early solar system evolution. |
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