Ah sorry, seems I did not give proper information - it was the whole crank arm that came off. And the bike is brand new. The two pieces are basically grooves that fit together and tighten.. the part attached to the frame says "Samox" and the crank arm itself says "Tighten to 12-14N-m by torque wrench". It does look like there is some slight damage to the metal. I've got great photos, but can't post yet since a newbie (I'll go make some posts to get me there!)

Appreciate the responses. Seems I should take back to my LBS when able to see extent of damage and if replacement is needed...