Passive Roof Thrust

The passive roof thrust crops out just north of dhurnal on the steep northern limb of the soan syncline.

Passive roof thrust.

This model may also explain a similar structural relationship between the main central thrust and the south tibet. 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. 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. Above the roof thrust the shortening is accommodated in different ways.

Lower to middle eocene ca. 57 43 ma man iobra formation in the eastern orocopia mountains fig. Passive roof duplex underlying floor sequence is commonly referred to as passive roof thrusting. With an active trust those additional responsibilities can be in respect to the control or management.

Extruded thrust sheet is bounded at top by orocopia chocolatefault ocf acting as a passive roof thrust. A trust where the trustee is held accountable for additional responsibilities. 2 a passive roof duplex requires two regionally active detachments that are kinematically linked in the foreland fig. Banks and warburton 1986 joined with the underlying body rides over the foreland.

Syntectonic sedimentation in the molasse basin is found to inhibit development of folding into the foreland but to promote prd style. 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. The central appalachian fold thrust belt is characterized by a passive roof duplex and as such the total shortening accom modated by the sequence above the roof thrust must equal the shortening. 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.

On the contrary backthrusting occurs when the roof sequence decoupled from the underlying body is passively transported over the hinterland. Forethrusting occurs when the roof sequence the sediments lying above the roof thrust. A thrust emplaced roof is preserved locally above these folds indicating that they constitute a duplex of fault truncated folds. In this type of structure termed passive roof duplex by banks and g arburton 1986 the roof sequence the rocks lying above the passive roof thrust glides passively over.

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.