中国地质大学：《构造地质学》课程PPT教学课件（英文版）strick-slip fault system

REVIEW

REVIEW

hangingwall ramp A-Ramps and flats hangingwall B- Hangingwall ramp and footwall footwall ramp footwall ramp C-? thrust sequence New thrusts develop in the footwall D-? thrust sequence New thrusts develop in the Hangingwall E- Thrust duplex roof thrust imbricate thrust slices are contained between a floor imbricate zone floor thrust thrust and a roof thrust F-Pop-up structure frontal ramp back thrust G- Triangle zone

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 Mylonites forming in delamination z A- Evolutionary model illustrating progressive extension accommodated by block rotation above a low-angle Rumple detachment taunts matay extensional fault Kinematic aotive meloni B- Listric fault with hangingwall rollover Youngest detachment faull A Hall-graben anticline. Area A and b are equal granite气 eC-Flat/ramp geometry of fault produces geometrically necessary folding in Hollow hangingwall hangingwall bloc Ramp I D- Antithetic faults in hangingwall E-Synthetic faults in footwall forming Litre fan listric fan hangingwall Hangingwall F- Extensional duplex with listric fan and Listne tan Counter fan antithetic counter fan G- Two listric faults linked by a transfer fault all three detach on the same sole fault

Extensional Fault Systems A- Evolutionary model illustrating progressive extension accommodated 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

Lecture 10 Strike-Slip Fault Systems

R R S) Fractures Generated During Strike-Slip Faulting

Fractures Generated During Strike-Slip Faulting

Stress Concentrations at Ends of strike-Slip Fault Compression Dilation Dilation Compression

Compression Dilation Compression Dilation Stress Concentrations at Ends of Strike-Slip Fault

Strike-slip fault system A- Local compressional Fault termination and extensional struc tures produced by fault terminations and fault Fault overlap overlaps B-Formation of raised Before movement After movement and depressed wedge shaped blocks by local transpression and transtension T2[34 Positive and negative flower structures produ Positive flower structure ced by convergence and divergence respectively in strike-slip motion Out of page Negative flower structure 3 D-Strike-slip duplex

Strike-slip fault system A- Local compressional 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 3 km Positive flower structure Negative flower structure for uplift blocks for depressed blocks

FLOWER STRUCTURE IN STRIKE-SLIP FAULTS Positive flower structure for uplift blocks Negative flower structure for depressed blocks

Joint

Joint

JOINT PATTERNS Key Words: Set, Systematic, Nonsystematic, Joint Zones Jont zone Jcn's ir a nasys:ematic an: set A. Single set c Traces of system D. Multiple Sets (After Twiss and Moores, 1992)

JOINT PATTERNS Key Words: Set, Systematic, Nonsystematic, Joint Zones (After Twiss and Moores, 1992) Single Set Multiple Sets