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28 Cards in this Set
- Front
- Back
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What are mesoscopic examples?
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Large scale
Hand Samples Outcrops |
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What are microscopic examples?
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perographic
sem tem |
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What is kinematic analysis?
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determination of sense of movement of particles of rock during deformation
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What kind of stress causes a normal fault? Reverse Fault? Thrust fault? Strike-slip fault? Anticline? Syncline?
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Normal = tensional stress
Reverse = compressional stress Thrust = compressional stress Strike slip = shear stress anticline = compressional stress syncline = compressional stress |
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What is folding the result of?
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Primary deformation (deformation that occurred during the formation of the rock)
Tectonic Deformation (deformation that developed in response to applied stress associated with movement and formation of mountain belts) |
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What is the hinge line when talking about folds?
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Line at the max curvature
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What is the crest line when talking about folds?
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line that marks the dip change
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What is the trough line when talking about folds?
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The line at min curvature
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What's the fold axis when talking about folds?
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line parallel to the cylinder
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What is the fold limb when talking about folds?
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Area between hinges
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what is the inflection line when talking about folds?
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Line that changes from convex to concave
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What are the different types of folds within major folds?
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Z folds and S folds
W fold and M folds |
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What is the adjective for
120-180 degree interlimb angle 70-120 degree intermlimb angle 30-70 degree intermlimb angle 10-30 degree intermlimb angle 0-10 degree intermlimb angle <0 degree intermlimb angle |
120-180 - gentle
70-120 - open 30- 70 - close 10-30 - tight 0-10 - isoclinal <0 - elasticas |
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What is an anticline?
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Two dipping limbs with the oldest rocks in the center
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What is a syncline?
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Two dipping limbs with the youngest rocks in the center
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What is a dome?
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All dipping sides with uplift in the middle.
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What is a basin?
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All dipping sides with a down swell in the middle?
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What is a monocline?
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One sided fold
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What is a kink band?
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A tabular zone in which an earlier foliation has been deflected into a new orientation
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What is ductile shear?
What is brittle shear? |
A plastic deformation process
A brittle deformation process that ends with a fault |
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What is a Slickenside?
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Lineations on faults surfaces that can be mineral deposits and/or grooves
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What is a foliation?
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recrystallization or formation of new minerals in response to pressure
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What is is disjunctive cleavage?
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Planes that cut across earlier foliation. They tend to break along this plane
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What is crenulation?
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microscale kinking of earlier fabric that results in fomration of a new foliation.
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What is a fracture?
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Surface on whih the rock has lost cohesion
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What is a fault?
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a fracture that has observable slip
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What is a joint?
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no observable slip
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Under what conditions could a 1st and 2nd fold occur?
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they can occur under a large compressional foce with 2 different rock types.
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