We analyzed noble gases from 18 samples of weathering products ('iddingsite') from the Lafayette meteorite. Potassium-argon ages of 12 samples range from near zero to 670 ± 91 Ma. These ages confirm the martian origin of the iddingsite, but it is not clear whether any or all of the ages represent iddingsite formation as opposed to later alteration or incorporation of martian atmospheric 40Ar. In any case, because iddingsite formation requires liquid water, this data requires the presence of liquid water near the surface of Mars at least as recently as 1300 Ma ago, and probably as recently as 650 Ma ago. Krypton and Xe analysis of a single 34 μg sample indicates the presence of fractionated martian atmosphere within the iddingsite. This also confirms the martian origin of the iddingsite. The mechanism of incorporation could either be through interaction with liquid water during iddingsite formation or a result of shock implantation of adsorbed atmospheric gas.
|Original language||English (US)|
|Number of pages||9|
|Journal||Meteoritics and Planetary Science|
|State||Published - Jan 2000|
ASJC Scopus subject areas
- Space and Planetary Science