| An interesting question, Eric. I don't have an immediate answer, but I did tackle Roark's destructive capacity in THE TRICKSTER ARCHETYPE AND OBJECTIVISM at jungianobjectivism.tripod.com.
There I make the case that Roark embodies both traits of creator and destroyer...more in the relationship between Roark to Toohey than in Roark to Dominique. The idea of an Objectivist destroyer is controversial, since the philosophy is seen as one of creation...and in the case of Dominique, she wasn't really destroying the bad to make way for Roark, instead she was destroying the good...and Roark COULD have blown up the building without her.
There is the idea of Galt, in Dagny's early view, of him as the "great destroyer", which probably better illustrates your idea.
I will put one other Jungian theory out there for explanation of Roark and Dominique, that of the Animus/Anima projection. Roark and Dominique are typical of the love/hate relationship found in much fiction (my favorite example is the Han Solo/Princess Leah romance.) You know how it goes: "You disgust me, yet I am strangely attracted to you...".
It's a cliche, and Rand was fond of inverting cliches, so maybe seen in this sense, it's not so difficult to see their relationship.
And if one reads Paglia's SEXUAL PERSONAE, you see a common theme throughout western art and literature of femme fetales and men submitting to women fatally, where otherwise rational men can't resist the siren song and fall prey to all sorts of horrors in the form of the feminine. Rand, in her celebration of masculinity embodied in reason and goal directed, rational selfishness, is able to reverse the cliche by having the "irrational" female submit to the powers of reason. That could explain the relationship in literary terms.