Roof Thrust Duplex

Duplex is a thrust sheet mass which is bounded by a fioor thrust and a roof thrust often duplex structures are imbricated.

Roof thrust duplex.

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. In a thrust envi ronment the structural association is. Boyer and elliott 1982 state that the roof thrust of a duplex is initiated as a major thrust. 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.

Blind thrusts are those below the erosion surface but their presence is indicated by shortening in the overlying sequence which is achieved by disharmonic. 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. Also upper and lower detachments have been described in a similar context for fold duplex structures dahlstrom 1969a. Duplexes have a variety of forms and sizes depending on the amount of displacement of the individual horses.

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. Two flat segments called thefloor and roof thrusts connected by several parallel ramp segments. Source for information on roof thrust. A duplex as a reminder is an array of thrust horses bounded by a floor thrust i e.

You can also visit the homepage and enjoy the wonderful photographies with very good examples from many places around the planet. A duplex consists of a series of imbricate faults that are asymptotic to a roof thrust and a floor thrust. Else in the world. A dictionary of earth sciences dictionary.

Sole thrust at the base and by a roof thrust at the top mcclay 1992. 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. The fault bound bodies of rock in the duplex are called horses.