Roof Thrust Duplex

A duplex consists of a series of imbricate faults that are asymptotic to a roof thrust and a floor thrust.

Roof thrust duplex. Duplex structures are a system of imbricate thrust faults that branch off from a floor thrust below and curve upward to join a roof thrust at a branch line. In a thrust envi ronment the structural association is. Roof thrust in a duplex system the structurally highest bounding thrust surface which joins the floor thrust at the leading and trailing edges of the duplex. Depending on the final orientations of the imbricate faults and the final position of the branch lines a duplex may be hinterland dipping foreland dipping or an antiformal stack.

Duplexes have a variety of forms and sizes depending on the amount of displacement of the individual horses. The rock masses bounded by these faults are calledhorses and the entire structural association is a duplex. Source for information on 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.

Thrust duplex duplexes occur where there are two decollement levels close to each other within a sedimentary sequence such as the top and base of a relatively strong sandstone layer bounded by two relatively weak mudstone layers. You can also visit the homepage and enjoy the wonderful photographies with very good examples from many places around the planet. Else in the world. The sicilian collisional complex is a well exposed fold and thrust belt ftb belonging to the apennine maghrebian chain developed along the africa europe plate margin fig.

Also upper and lower detachments have been described in a similar context for fold duplex structures dahlstrom 1969a. The fault bound bodies of rock in the duplex are called horses. A dictionary of earth sciences dictionary. Boyer and elliott 1982 state that the roof thrust of a duplex is initiated as a major thrust.

In this setting the roof sequence frequently develops passive roof duplexes banks and warburton 1986. Blind thrusts are those below the erosion surface but their presence is indicated by shortening in the overlying sequence which is achieved by disharmonic. Two flat segments called thefloor and roof thrusts connected by several parallel ramp segments.