Structural Geology Exam 3 - Part 1

Front 1

Anisotropic Rx

Back 1

rocks that possess mechanical weakness; Depart from the normal behavior expected

Front 2

Fault Reactivation

Back 2

Fault that is changed in the original orientation of the fault; reverse to normal or normal to reverse

Front 3

Thrust Sheet

Back 3

regional packages of rx above thrust faults

Front 4

Syntectonic Basin Deposits

Back 4

fault-bounded uplifts and dumped during the course of thrusting

Front 5

Allohthonous

Back 5

regional thrust sheets that have moved great distances

Front 6

Autochthonous

Back 6

Retain their original location b/c they have not beed thrusted

Front 7

Windows (fenester)

Back 7

cut through allochthonous to provide insight into autochthonous

Front 8

Klippen

Back 8

discloses former extensiveness of overthrust strata; Shows mainly autochthonous and some allochthonous

Front 9

Decollement -process

Back 9

the detachment of the upper cover from its substratum

Front 10

Thin-Skinned Overthrusting

Back 10

large movement that does not involve basement rx.

Front 11

Tectonic Transport

Back 11

the direction of translation of the hangingwall relative to the footwall

Front 12

Balance X-Section

Back 12

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

Front 13

Tear Fault

Back 13

transverse strike-slip faults which result from overthrust belts

Front 14

Transfer Zone

Back 14

overlapped ends of faults in which decreasing slip on one fault is compensated by increasing slip on the other

Front 15

Ramp (step)

Back 15

where the fault cuts obliquely across competent beds

Front 16

Fault-Bend Folds (Snakehead folds)

Back 16

when the faulted hangingwall strata are translated to the top of the ramp and then again assumes a parallel position; *Flexed into an anticline

Front 17

Lateral Ramp

Back 17

places where a thrust flat abruptly cuts up-section laterally as a ramp until it reaches a higher glide horizon and becomes flat again

Front 18

Footwall Ramp

Back 18

the ramp which results from the footwall

Front 19

Hangingwall Ramp

Back 19

the ramp which results from the fault-bend fold; *On top of the footwall flat

Front 20

Hangingwall Flat

Back 20

the flat fault segment parallel to bedding that is par of the hangingwall

Front 21

Footwall Flat

Back 21

the flat fault segment parallel to bedding that is part of the footwall

Front 22

Blind Thrust

Back 22

thrust that does not make it to the surface and is replaced by a fold; *Tip line of the thrust will be underground

Front 23

Horse

Back 23

fault block surrounded by fault surfaces

Front 24

Imbricate Fans

Back 24

marked by a sole thrust, downward into which a swarm of curved triangular thrust slices converge; *Open upward

Front 25

Duplexes

Back 25

horses and thrusts bound above and below by major flat-lying thrusts; *Foreland-dipping duplex where fault slip exceeds slice length

Front 26

Floor Thrust

Back 26

flat-lying undisturbed strata beneath bottom layer of a horse; *Found in a duplex

Front 27

Roof Thrust

Back 27

top layer of a duplex; *Overlain by undisturbed strata