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- W2062023169 abstract "In situ measurements of 12 C/ 13 C of atmospheric CO 2 on Mars made by Viking are, within error, similar to values normally encountered on Earth. However, high precision isotopic measurements made on SNC meteorites show there to be a 40‰ fractionation between carbon associated with silicate minerals (δ 13 C ≈ −25‰, 12 C/ 13 C ≈ 91.3) and trapped CO 2 gas or carbonate minerals (δ 13 C ≈ +15‰, 12 C/ 13 C ≈ 87.7). To a first approximation, it can be considered that the silicate‐sited carbon in SNC meteorites carries the isotopic signature of the element present at depth in the Martian crust; herein it is considered that this magmatic carbon is representative of bulk Mars. On the other hand, carbon in the form of carbonate most probably results from secondary processes in operation at the surface of the planet. Trapped CO 2 is thought to be a sample of Martian atmospheric gas. The significant difference in isotopic composition between the different components in SNC meteorites is difficult to interpret in terms of closed‐system equilibrium or kinetic isotopic fractionation effects. Rather, it seems that the relative enrichment of 13 C in surficial carbon is due to preferential removal of the lighter isotope during an atmospheric loss process. Between 30 and 70 mbar of CO 2 may have been lost from the atmosphere to outer space." @default.
- W2062023169 created "2016-06-24" @default.
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- W2062023169 date "1990-08-30" @default.
- W2062023169 modified "2023-09-26" @default.
- W2062023169 title "The evolution of atmospheric CO<sub>2</sub>on Mars: The perspective from carbon isotope measurements" @default.
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- W2062023169 doi "https://doi.org/10.1029/jb095ib09p14789" @default.
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