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Geometric and kinematic analyses conducted in the northeastern Brooks Range constrain the evolution of a detachment folded roof sequence above a regional duplex . At least some of the detachment folds formed by fixed arclength kinematics above a detachment unit that changed thickness during deformation and served as the roof thrust of the duplex. The horses in the duplex -are fault-bend folds with gently dipping limbs and 'sub-horizontal crestal panels and detachment fold-trains occur above bends in the fault-bend folds and are separated by straight panels in the roof sequence. Detachment folds above the gently dipping backlimbs of the horses are north-vergent, whereas those above the forelimbs are both northand south-vergent. Folds above the crestal panels / are largely symmetric and those above the synform that separates the fault-bend folds are highly north-vergent and truncated by thrust faults. This distribution of detachment fold asymmetries suggests a complex structural history involving both forward and hindward displacements and it suggests a kinematic relationship between the fault-bend folded horses and the detachment folded roof sequence.

The structural geometry of detachment folds above a duplex in the Franklin Mountains, northeastern Brooks Range, Alaska