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Examples of enriched occurrences of some key transition elements discovered during the MSL mission, compared to the Earth’s average crustal concentrations, SNC meteorites [125], and a typical Martian global soil composition [123]. “Mars enrichments”: nickel maxima (except for meteorites) for three rover missions (MER, MSL); Cu at Gale crater [196]; Zn also all three missions, plus up to 8000 ppm in Gale; boron at Gale [198].
