EXAM 2 Structural Geology Flashcards
Types of Folds
Anticline
Syncline
Monocline
Dome
Basin
Types of folds: Anticline/ Plunging anticline
A frown shape
beds dip away from the center
beds are oldest in the center
beds dip away from the axis
Types of folds:Syncline/ Plunging Syncline
smile shape
Beds dip towrad the center
beds are youngest in the center
beds dip toward center axis
types of folds: Monocline
Half anticline half syncline
Types of folds:Dome
upside down bowl shape
oldest beds in the center
beds dip away from the axis
Types of folds: Basin
upright bowl shape
youngest beds inthe center
beds dip toward the center
Types of Faults: Normal
Foot wall moves up hanging wall moves down
Types of fualts: Reverse thrusts Faults
Hanging wall moves up and footwall moves down
types of faults: Strike slip
Left lateral: left most wall is down
Right lateral: Right most wall is down
joints
A fracture or break in the rock where no displacements has occurred
Strike
the compass dorection of a line formed by the intersection of an inclined plane woth a horizontal plane
Dip
the dorection and angle downwarod from horizontal of which plane is oriented
NESW in degrees
North= 0*
NE=45*
East= 90*
SE=135*
South=180*
SW=225
West= 270*
NW=315*
3 type sof Differential stress:
Tensional
falling apart ⬅️ ➡️
3 type sof Differential stress:
compressional
squeezing together ➡⬅
3 type sof Differential stress:
Shear
Side to side
⬇️⬆️
Types of strain: Ductile Deformation
When rocks change shape
creates rock folds
hig confining stress
Types of strain:Brittle Deformation
when rocks break
creates rock features
low confining stress
