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27 Cards in this Set
- Front
- Back
Anisotropic Rx
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rocks that possess mechanical weakness; Depart from the normal behavior expected
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Fault Reactivation
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Fault that is changed in the original orientation of the fault; reverse to normal or normal to reverse
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Thrust Sheet
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regional packages of rx above thrust faults
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Syntectonic Basin Deposits
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fault-bounded uplifts and dumped during the course of thrusting
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Allohthonous
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regional thrust sheets that have moved great distances
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Autochthonous
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Retain their original location b/c they have not beed thrusted
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Windows (fenester)
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cut through allochthonous to provide insight into autochthonous
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Klippen
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discloses former extensiveness of overthrust strata; Shows mainly autochthonous and some allochthonous
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Decollement -process
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the detachment of the upper cover from its substratum
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Thin-Skinned Overthrusting
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large movement that does not involve basement rx.
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Tectonic Transport
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the direction of translation of the hangingwall relative to the footwall
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Balance X-Section
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structural profiles drawn to avoid violating the original x-sectional area of the rx that were subjected to deformation; Did not alter bed thickness *Beds all of equal length
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Tear Fault
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transverse strike-slip faults which result from overthrust belts
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Transfer Zone
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overlapped ends of faults in which decreasing slip on one fault is compensated by increasing slip on the other
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Ramp (step)
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where the fault cuts obliquely across competent beds
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Fault-Bend Folds (Snakehead folds)
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when the faulted hangingwall strata are translated to the top of the ramp and then again assumes a parallel position; *Flexed into an anticline
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Lateral Ramp
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places where a thrust flat abruptly cuts up-section laterally as a ramp until it reaches a higher glide horizon and becomes flat again
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Footwall Ramp
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the ramp which results from the footwall
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Hangingwall Ramp
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the ramp which results from the fault-bend fold; *On top of the footwall flat
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Hangingwall Flat
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the flat fault segment parallel to bedding that is par of the hangingwall
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Footwall Flat
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the flat fault segment parallel to bedding that is part of the footwall
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Blind Thrust
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thrust that does not make it to the surface and is replaced by a fold; *Tip line of the thrust will be underground
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Horse
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fault block surrounded by fault surfaces
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Imbricate Fans
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marked by a sole thrust, downward into which a swarm of curved triangular thrust slices converge; *Open upward
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Duplexes
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horses and thrusts bound above and below by major flat-lying thrusts; *Foreland-dipping duplex where fault slip exceeds slice length
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Floor Thrust
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flat-lying undisturbed strata beneath bottom layer of a horse; *Found in a duplex
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Roof Thrust
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top layer of a duplex; *Overlain by undisturbed strata
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