Highly Siderophile Elements in Shergottite Sulfides and the Sulfur Content of the Martian Mantle
Geochimica et Cosmochimica Acta
First page number:
Last page number:
Shergottite meteorites are ultramafic to mafic igneous rocks derived from partial melting of distinct regions of the martian mantle. As such, they trace magmatic processes, including fractional crystallization and mixing processes in Mars. New chalcophile (Cu, Se, Zn, Pb), siderophile (Ni, Co, W), and highly siderophile element (HSE: Au, Re, Pd, Rh, Pt, Ru, Ir, Os) abundance data are reported for sulfide assemblages in a suite of thirteen incompatible trace-element depleted, intermediate and enriched shergottites, along with new whole-rock HSE abundance and 187Os/188Os data for seven shergottites. Sulfide grains in depleted and intermediate shergottites typically have the highest absolute abundances of HSE, with broadly flat CI-chondrite normalized patterns. Enriched shergottite sulfide grains typically have highly variable Au, elevated Pd and Rh and are relatively depleted in Zn, Ir and Os. The new HSE whole-rock data for enriched (Northwest Africa [NWA] 7397, NWA 7755, NWA 11043), and intermediate shergottites (NWA 10961, NWA 11065, NWA 12241, and NWA 12536) are generally consistent with existing 187Os/188Os and HSE abundance data for these geochemical groupings. Enriched shergottites with... (See full abstract in article).
Shergottite; Sulfide; Mars; Highly siderophile elements; Sulfur; Bulk silicate mars
Day, J. M.,
Rahib, R. R.,
Tait, K. T.,
Neal, C. R.
Highly Siderophile Elements in Shergottite Sulfides and the Sulfur Content of the Martian Mantle.
Geochimica et Cosmochimica Acta, 293