ase , ▁ 2 0 – 3 5 % ▁clin opy ro x ene ▁and ▁Fe - T i ▁ox ides . ▁Both ▁high - T i ▁ox ides ▁and ▁low - T i ▁ox ides ▁vari eties ▁occur ▁in ▁the ▁rocks . ▁ ▁T ect onic ▁setting ▁The ▁intr usion ▁of ▁the ▁Ok av ango ▁Dy ke ▁Sw arm ▁is ▁a ▁poly phase ▁system , ▁meaning ▁dy ke ▁emp lacement ▁occurred ▁in ▁a ▁number ▁of ▁stages . ▁Pro ter oz o ic ▁dy kes ▁were ▁formed ▁by ▁intr us ions ▁before ▁the ▁Dy ke ▁sw arm ▁extend ▁west wards ▁due ▁to ▁the ▁Kar oo ▁mag mat ism ▁at ▁approximately ▁ 1 8 2 ▁Ma . ▁ ▁The ▁G ond w ana ▁super cont inent ▁consists ▁of ▁present ▁Africa , ▁Mad agas car , ▁India ▁and ▁parts ▁of ▁Ant arct ica . ▁The ▁separation ▁and ▁assembly ▁of ▁pl ates ▁induced ▁the ▁Kar oo ▁vol can ism ▁intr us ive ▁event . ▁As ▁two ▁adjacent ▁contin ents ▁Africa ▁and ▁Ant arct ica ▁moved ▁in ▁strike - s lip ▁motion , ▁earth qu akes ▁were ▁common . ▁A ▁dy ke ▁can ▁be ▁formed ▁in ▁a ▁single ▁earth qu ake . ▁Hence ▁in ▁a ▁series ▁of ▁earth qu akes , ▁a ▁whole ▁sw arm ▁of ▁similar ▁dy kes ▁can ▁be ▁formed . ▁ ▁There ▁are ▁different ▁hypothesis ▁developed ▁to ▁account ▁for ▁the ▁origin ▁of ▁the ▁Ok av ango ▁Dy ke ▁Sw arm ▁as ▁well ▁as ▁the ▁Kar oo ▁Tri ple ▁J unction , ▁namely : ▁In