Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993chwe.work...37t&link_type=abstract
In Lunar and Planetary Inst., MSATT Workshop on Chemical Weathering on Mars p 37-39 (SEE N93-31933 12-91)
Other
Clays, Geochemistry, Mars (Planet), Meteorites, Meteoritic Composition, Nakhlites, Planetary Geology, Weathering, Iron Oxides, Olivine, Scanning Electron Microscopy, Textures, Transmission Electron Microscopy, X Ray Spectroscopy
Scientific paper
Lafayette, one of the SNC (martian) meteorites, contains preterrestrial alteration materials rich in smectite and ferric oxides. The compositions and textures of the veinlets suggest that they were formed in episodic alteration events by waters that contained a relatively small load of dissolved salts. The Lafayette achondrite, one of the nakhlites of probable martian origin, is an igneous rock consisting mostly of augite and olivine, with interstitial feldspar, sulfides (pyrite), high-Si glass, and other phases. Like Nakhla itself, Lafayette contains veinlets of hydrous alteration materials. We studied thin sections of sample ME2116 (Field Museum, Chicago), using scanning and transmission electron microscopy (SEM and TEM) with energy dispersive X-ray spectrometry (EDS).
Barrett Ruth A.
Gooding James L.
Treiman Allan H.
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