Pyrite alteration

Sulfur- and Iron-Rich Mineralogical Features Preserved in Permafrost in the Canadian High Arctic: Analogs for the Astrobiological Exploration of Mars

Elliptical sulfate-rich features, stained red by the presence of iron oxides, are set within permafrost and carbonate rock at Borup …

Graham E. Lau, Chris Trivedi, Stephen E. Grasby, John R. Spear, Julie Cosmidis, Alexis S. Templeton