The higher Cr and Ni abundances are clearly suggestive of
mafic and/or ultramafic provenance; ultramafic lithologies in
ophiolite sequences can attain Cr/Ni ratios of 10 or more
(Jaques et al., 1983). Therefore, the higher Cr/Ni ratios
(Table 2) reflect the ophiolitic ultramafic sources for the
studied sandstones.