▁networks . ▁The ▁over lying ▁Jur ass ic ▁vol can ic ▁rocks ▁are ▁mainly ▁bas alt ic ▁la va ▁flows . ▁ ▁Kar oo ▁triple ▁j unction ▁ ▁H uge ▁dy ke ▁sw ar ms ▁are ▁formed ▁in ▁radial ▁geometry . ▁They ▁include ▁the ▁N 1 1 0 ° ▁striking ▁Ok av ango ▁dy ke ▁sw arm , ▁the ▁N 7 0 ° ▁striking ▁Save - L imp opo ▁Dy ke ▁Sw arm , ▁the ▁Ol if ants ▁River ▁Dy ke ▁Sw arm ▁and ▁the ▁N - S ▁Leb om bo ▁dy ke ▁sw arm . ▁The ▁coverage ▁of ▁the ▁area ▁in ▁n ortheast ▁B ots w ana ▁is ▁called ▁the ▁Kar oo ▁Tri ple ▁J unction . ▁ ▁In tr us ive ▁events ▁and ▁dy ke ▁sw arm ▁emp lacement ▁in ▁Kar oo ▁Lar ge ▁Ig ne ous ▁Province ▁occurred ▁during ▁ 1 8 3 – 1 7 4 ▁Ma ▁in ▁the ▁Mes oz o ic ▁era . ▁Ro cks ▁produced ▁by ▁the ▁Kar oo ▁triple ▁j unction ▁are ▁pre domin antly ▁contin ental ▁flo od ▁bas al ts , ▁which ▁are ▁usually ▁associated ▁with ▁huge ▁mag m atic ▁events ▁during ▁the ▁Ph an ero zo ic ▁e on . ▁In ▁the ▁Kar oo ▁triple ▁j unction , ▁rocks ▁are ▁dated ▁to ▁the ▁ 1 8 0 ▁Ma ▁Kar oo ▁mag m atic ▁event , ▁which ▁occurred ▁due ▁to ▁the ▁break up ▁of ▁G ond w ana ▁and ▁the ▁opening ▁of ▁Indian ▁Ocean . ▁It ▁consisted ▁of ▁ma fic ▁la va ▁flow