Passive Roof Thrust

Syntectonic sedimentation in the molasse basin is found to inhibit development of folding into the foreland but to promote prd style.

Passive roof thrust.

2 a passive roof duplex requires two regionally active detachments that are kinematically linked in the foreland fig. An overstep passive roof thrust sakhwal fault is interpreted west of dhurnal which developed due to southward progression of the deformation front beneath the earlier passive roof thrust. Experiments simulate many of the principal characteristics of fold and thrust belts developed above a basal evaporite décollement as well as the development of passive roof duplexes at mountain fronts. Banks and warburton 1986 joined with the underlying body rides over the foreland.

Above the roof thrust the shortening is accommodated in different ways. Develop at the front of fold and thrust belts. Forethrusting occurs when the roof sequence the sediments lying above the roof thrust. Continuous thrusting results in shortening between the lower and the upper detachment and consequent formation of a duplex bound by two thrusts of opposite vergence.

This model may also explain a similar structural relationship between the main central thrust and the south tibet. On the contrary backthrusting occurs when the roof sequence decoupled from the underlying body is passively transported over the hinterland. Extruded thrust sheet is bounded at top by orocopia chocolatefault ocf acting as a passive roof thrust. I suggest that the fault was a northeast directed passive roof thrust that linked with a southwest directed basal décollement the vincent thrust during early tertiary flat subduction of the farallon plate beneath north america.

A thrust emplaced roof is preserved locally above these folds indicating that they constitute a duplex of fault truncated folds. However active roof duplexes couzens and wiltschko 1996 do not strictly follow the geometric characteristics of triangle zones which have a hinterland verging passive roof thrust. 57 43 ma man iobra formation in the eastern orocopia mountains fig. The passive roof thrust crops out just north of dhurnal on the steep northern limb of the soan syncline.

Lower to middle eocene ca. With an active trust those additional responsibilities can be in respect to the control or management. The passive roof thrust. Passive roof duplex underlying floor sequence is commonly referred to as passive roof thrusting.

Formation of the passive roof duplex and the symmetrical detachment folds in its roof may have been facilitated by relatively low shortening and the effectiveness of the kayak shale as a detachment horizon.