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Science 22 August 2003:
Vol. 301. no. 5636, pp. 1084 - 1087
DOI: 10.1126/science.1088054

Reports

Spectroscopic Identification of Carbonate Minerals in the Martian Dust

Joshua L. Bandfield,* Timothy D. Glotch, Philip R. Christensen

Thermal infrared spectra of the martian surface indicate the presence of small concentrations (~2 to 5 weight %) of carbonates, specifically dominated by magnesite (MgCO3). The carbonates are widely distributed in the martian dust, and there is no indication of a concentrated source. The presence of small concentrations of carbonate minerals in the surface dust and in martian meteorites can sequester several bars of atmospheric carbon dioxide and may have been an important sink for a thicker carbon dioxide atmosphere in the martian past.

Department of Geological Sciences, Arizona State University, Tempe, AZ 85287–6305, USA.

* To whom correspondence should be addressed. E-mail: joshband{at}asu.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)