Core composition of the vein tourmalines is similar to the
composition of the AMB tourmaline. The formation of the AMB tourmaline and cores of the vein tourmalines
are proposed to be related to the regional D1 deformational event associated with the
emplacement of the adjoining ca. 2.61 Ga Chitradurga granite whilst rims of the vein tourmalines vis-àvis
gold mineralization is spatially linked to the juvenile magmatic accretion (2.56e2.50 Ga) east of the
studied area in the western part of the eastern Dharwar craton