Dvs. Rao et Sm. Naqvi, Archaean komatiites from the older schist belt of Kalyadi in western Dharwar craton, Karnataka, J GEOL S IN, 53(3), 1999, pp. 347-354
The cluster of enclaves at Kalyadi, Hassan district includes ultramafic-maf
ic metavolcanic rocks and minor metasedimentary rocks such as chert, cherty
quartzite and pelite. Occurrence of pillow and vesicular structures in the
ultramafic rocks is being reported for the first time from this area. The
avenge composition of the ultramatic rocks is :SiO2 46.05%, TiO2 0.18%, MgO
31.81%, K2O 0.15%, Cr 3409 ppm and Ni 1610 ppm with a CaO/Al2O3 ratio clos
e tol. The composition, relict igneous structures and metasedimentary rock
association are suggestive of a komatiitic affinity for these rocks, which
possibly accumulated under subaqueous conditions.