How would a slip-strike fault develop in my terrain?

I am designing a fictitious continent, and as part of this I am also designing the prehistoric development of the continent up to the present day.

A particular tricky part of this has been that, in my present day version, off the Southeast coast of the continent, a region of continental crust that rifted off of the main landmass has a slip-strike fault running through it that has effectively trapped part of the continental crust on the other plate and is currently dragging it to the south-southwest.

However, when this terrain separates from the main continent due to back-arc formation, it is bordered to the east solely by a subduction zone. I need a way for a new fault to develop at that NNE-SSW boundary, one that traps a fragment of crust on the other plate, creating a new slip-strike boundary that separates the subduction of oceanic crust to the west underneath the separated continental crust to the south, and the original eastern oceanic plate sinking underneath the terrane to the west in the north.

Is there anyway that this situation can be achieved realistically?

posted over 4 years ago

Antarctica07‭

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