文档介绍：REVIEW
A - Ramps and flats
B – Hangingwall ramp and
footwall ramp
C –? thrust sequence
New thrusts develop in the
footwall
D –? thrust sequence
New thrusts develop in the
Hangingwall
E – Thrust duplex:
imbricate thrust slices are
contained between a floor
thrust and a roof thrust
F - Pop-up structure
G – Triangle zone
? ?
?
Extensional Fault Systems
A- Evolutionary model illustrating
progressive extension modated
by block rotation above a low-angle
extensional fault.
B- Listric fault with hangingwall rollover
anticline. Area A and B are equal.
C – Flat/ramp geometry of fault produces
geometrically necessary folding in
hangingwall.
D- Antithetic faults in hangingwall.
E – Synthetic faults in footwall forming
listric fan.
F- Extensional duplex with listric fan and
antithetic counter fan.
G- Two listric faults linked by a transfer
fault;all three detach on the same sole fault.
Lecture 10 Strike-Slip Fault Systems
Fractures Generated During Strike-Slip Faulting
Compression
Compression
Dilation
Dilation
Stress Concentrations at Ends of Strike-Slip Fault
Strike-slip fault system
A- pressional
and extensional struc-
tures produced by fault terminations and fault
overlaps.
B-Formation of raised
and depressed wedge-
shaped blocks by local
transpression and
transtension.
C- Positive and negative
flower structures produ-
ced by convergence and
divergence respectively
in strike-slip motion
D-Strike-slip duplex
FLOWER STRUCTURE IN STRIKE-SLIP FAULTS
Positive flower structure
for uplift blocks
Negative flower structure
for depressed blocks
Joint
JOINT PATTERNS
Key Words: Set, Systematic, Nonsystematic, Joint Zones
(After Twiss and Moores, 1992)
Single Set
Multiple Sets