Oxygen Isotopic Evidence for Aqueous Activity on Mars: Delta 180 of Lafayette Iddingsite

Details Oxygen Isotopic Evidence for Aqueous Activity on Mars: Delta 180 of Lafayette Iddingsite Oxygen Isotopic Evidence for Aqueous Activity on Mars: Delta 180 of Lafayette Iddingsite

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1099r&link_type=abstract

Lunar and Planetary Science, volume 27, page 1099

Physics

4

Alteration: Aqueous, Enriched Oxygen Carrier, Iddingsite, Meteorites: Snc, Oxygen Isotopes

Scientific paper

This study was prompted by the observation that oxygen in Lafayette is significantly enriched in 18 O over than that in Nakhla, delta 18 O = 5.3 per mil vs. 4.7 per mil (all relative to SMOW) even though both meteorites have essentially the same delta 18 O for their olivines (~4.0 per mil) and augites (~4.8 per mil). A possible source of this 18 O-enriched oxygen in Lafayette is preterrestrial aqueous alteration material, which is much more abundant in Lafayette than in Nakhla. This alteration material, "iddingsite," in both meteorites consists principally of smectite clay and ferrihydrite replacing magmatic olivine and siliceous glass. To test this hypothesis, separates of augite, olivine, and "iddingsite" were extracted from Lafayette and analyzed for oxygen isotopes by laser fluorination. _

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