The sulfur budget and sulfur isotopic composition of Martian regolith breccia NWA 7533

Sulfur Speciation in the Martian Regolith Component in Shergottite Glasses

Introduction: We have shown that Gas-Rich Impact-Melt (GRIM) glasses in Shergotty, Zagami, and EET79001 (Lith A and Lith B) contain Martian regolith components that were molten during impact and quenched into glasses in voids of host rock materials based on neutron-capture isotopes, i.e., 150 Sm excesses and 149 Sm deficits in Sm, and 80 Kr excesses produced from Br [1, 2]. These GRIM glasses a...

Isotopic Evidence for a Martian Regolith Component in Martian Meteorites

Introduction: Noble gas measurements in gas-rich impact-melt (GRIM) glasses in EET79001 shergottite showed that their elemental and isotopic composition is similar to that of the Martian atmosphere [1-3]. The GRIM glasses contain large amounts of Martian atmospheric gases. Those measurements further suggested that the Kr isotopic composition of Martian atmosphere is approximately similar to tha...

Metal-saturated sulfide assemblages in NWA 2737: Evidence for impact-related sulfur devolatilization in Martian meteorites

NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal-saturated Fe-Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni-poor troilite (Fe ⁄S = 1.0 ± 0.01), sometimes Cr-bearing (up to 1 wt%), coexists with micrometer-...

Rare-earth Minerals in Martian Meteorite Nwa 7034/7533: Evidence for Fluid-rock Interaction in the Martian Crust

New bulk sulfur measurements of Martian meteorites and modeling the fate of sulfur during melting and crystallization – Implications for sulfur transfer from Martian mantle to crust–atmosphere system