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Magmatic carbon in Martian meteorites: attempts to constrain the carbon cycle on Mars

Grady, M.M.; Verchovsky, A.V. and Wright, I.P. (2004). Magmatic carbon in Martian meteorites: attempts to constrain the carbon cycle on Mars. International Journal of Astrobiology, 3(2) pp. 117–124.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1017/S1473550404002071
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Abstract

One of the current goals of Martian exploration is to find evidence for extinct (or even extant) life. Carbon (an essential ingredient of life on Earth) is known to occur on Mars as CO2 in the atmosphere and frozen in the polar caps; it is inferred to be present as carbonates in the Martian crust and soils. We are attempting to define and quantify the different carbon reservoirs on Mars, so that we can follow Mars' carbon cycle. This paper discusses a primordial magmatic component that could be the starting point of such a cycle. The nature, distribution and isotopic composition of carbon was measured in a suite of Martian meteorites, comprising Chassigny and 11 shergottites. Other Martian meteorites were not included, as they sample rocks that have been altered by fluids at Mars' surface. Our results, obtained by high-resolution stepped combustion and mass spectrometry, show that the magmatic component has a very variable abundance of 1–100 ppm, with [delta]13C~[minus sign]20±4‰. This value is close to magmatic carbon determined for Moon and for Vesta (the parent body of the HED basaltic meteorites), but very different from that of Earth.

Item Type: Journal Article
ISSN: 1473-5504
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record.
Keywords: carbon dioxide; carbon isotopes; magmatic gases; Mars; Martian meteorites
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 5375
Depositing User: Users 6044 not found.
Date Deposited: 29 Aug 2006
Last Modified: 05 Dec 2010 06:30
URI: http://oro.open.ac.uk/id/eprint/5375
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