Passive 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.

Passive roof thrust.

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. On the contrary backthrusting occurs when the roof sequence decoupled from the underlying body is passively transported over the hinterland. 2 a passive roof duplex requires two regionally active detachments that are kinematically linked in the foreland fig. Develop at the front of fold and thrust belts.

This model may also explain a similar structural relationship between the main central thrust and the south tibet. Passive roof duplex underlying floor sequence is commonly referred to as passive roof thrusting. 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. The passive roof thrust crops out just north of dhurnal on the steep northern limb of the soan syncline.

Forethrusting occurs when the roof sequence the sediments lying above the roof thrust. With an active trust those additional responsibilities can be in respect to the control or management. A trust where the trustee is held accountable for additional responsibilities. 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.

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. The passive roof thrust. Lower to middle eocene ca.

Extruded thrust sheet is bounded at top by orocopia chocolatefault ocf acting as a passive roof thrust. Syntectonic sedimentation in the molasse basin is found to inhibit development of folding into the foreland but to promote prd style. Banks and warburton 1986 joined with the underlying body rides over the foreland. 57 43 ma man iobra formation in the eastern orocopia mountains fig.

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.