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Transmission Electron Microscopy of CONCORDIA UltraCarbonaceous Antarctic MicroMeteorites (UCAMMs): Mineralogical properties
Engrand, C.; Rouzaud, J. -N.; Duprat, J. +2 more
We performed mineralogical and petrographic studies of three UltraCarbonaceous Antarctic Micrometeorites (UCAMMs) by analytical transmission electron microscopy (TEM). The UCAMMs were identified in the CONCORDIA micrometeorite collection (2002 and 2006) recovered from central Antarctic snow, and are of probable cometary origin. UCAMMs are dominate…
Evaluating the role of sulfide-weathering in the formation of sulfates or carbonates on Mars
Mangold, N.; Chevrier, V.; Dehouck, E. +3 more
Orbital and landed missions to Mars have revealed complex sulfate- and Fe-oxide-bearing mineralogical assemblages, which have been interpreted as the result of a late planet-wide acidic period due to large SO2 emissions. However, this global scenario does not explain the recent discovery of Hesperian and Noachian-aged carbonates in seve…