Hier in Ergänzung noch ein Artikel zum Thema:
Formation of Carbonate Minerals in Martian Meteorite ALH 84001 from Cool Water Near the Surface of Mars (15.12.11)
by G. Jeffrey Taylor
A new approach to thermometry using isotopic compositions of carbon and oxygen indicates that carbonate minerals in Martian meteorite ALH 84001 formed at 18 ± 4 oC.
http://www.psrd.hawaii.edu/Dec11/PSRD-ALH84001_Carb.pdf Martin