▁brit t le ▁f ract ure ▁networks , ▁instead ▁of ▁stress ▁formed ▁by ▁the ▁plate ▁movement . ▁ ▁Dy ke ▁emp lacement ▁process ▁The ▁geometry ▁of ▁the ▁Kar oo ▁Tri ple ▁J unction , ▁which ▁is ▁the ▁bul ging ▁up ward ▁of ▁land ▁surface , ▁might ▁be ▁formed ▁due ▁to ▁ext ensional ▁t ect on ics . ▁Cra ck ing ▁and ▁joint ing ▁are ▁induced , ▁hence ▁lines ▁of ▁weak ness es ▁are ▁developed ▁in ▁the ▁region . ▁In ▁the ▁Th une ▁section ▁of ▁the ▁Ok av ango ▁dy ke ▁sw arm , ▁the ▁texture ▁of ▁the ▁rocks ▁show ▁evidence ▁of ▁de formation ▁caused ▁by ▁t ensional ▁stra in . ▁Plan ar ▁fol i ations ▁are ▁found ▁in ▁rock ▁gra ins ▁which ▁are ▁per pend icular ▁to ▁the ▁dy ke ▁plane . ▁ ▁It ▁is ▁suggested ▁that ▁mag ma ▁can ▁flow ▁later ally ▁from ▁east ▁to ▁west . ▁So ▁mag ma ▁flow ing ▁to ▁Ok av ango ▁Dy ke ▁Sw arm ▁is ▁s our ced ▁from ▁later al ▁side ▁from ▁the ▁Kar oo ▁Tri ple ▁j unction , ▁rather ▁than ▁an ▁u pr ising ▁active ▁mant le ▁pl ume ▁head . ▁ ▁Also , ▁Pro ter oz o ic ▁dy kes ▁and ▁f ract ures ▁present ▁in ▁the ▁cr ust ▁may ▁control ▁the ▁orientation ▁of ▁dy ke ▁intr usion . ▁When ▁ igne ous ▁intr us ions ▁occurred ▁during ▁the ▁Kar oo ▁mag mat ism ▁in ▁the ▁Jur ass ic ▁period , ▁they ▁follow ▁the ▁directions ▁of ▁previous ▁dy kes . ▁The ▁number