Strike slip fault and its related structure
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Strike-slip fault and its related structure. 01003117 LuoMao. Strike-slip fault. Definition : a kind of fault that the two blocks move along the strike direction of fault plane. It can be subdivided into two kinds. sinistral(left lateral)-----the opposite block moves to the left

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Strike-slip fault and its related structure

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Strike slip fault and its related structure

Strike-slip fault and its related structure

01003117 LuoMao


Strike slip fault

Strike-slip fault

  • Definition : a kind of fault that the two blocks move along the strike direction of fault plane. It can be subdivided into two kinds.

    sinistral(left lateral)-----the opposite block moves to the left

    dextral(right lateral)-----the opposite block moves to the right.


Mechanism of strike slip fault

Mechanism of strike-slip fault

Fault is the result of force and stress.

Different force situations would generate

different faults.

The force system of strike-slip fault

is plotted as follows

The greatest stress is horizontal,

the smallest stress is horizontal,

two sets of strike-slip fault inter-

sect along the intermediate Picture in two dimension

stress,each dipping vertically. (Down plunge view)

σ3

σ1


Strike slip fault and its related structure

Fault orientation in relation to principal stress axes

(After E.M.Anderson, 1951)

A Normal fault sets. B Thrust fault sets. C Strike-slip fault sets


Fault plane fault zone

 Fault plane  Fault zone

  • Fault plane usually is a plane and the

    dip angle is approximate 90 degree.

    The strike line on the ground extends

    straightly in a region(picture A).But

    there are some exceptions.

    Sometimes the strike line curves(B).

    because of the characteristics

    of adjacent blocks and even

    form a zone(C).

A

B

C


Flower structure

Flower structure

  • If the fault plane curves,under the effect of greatest stress,it would bear movement along two direction.

    Part A combines both strike-slip movements and

    compression.It would move upwards to form

    positive flower structure,as to

    part B,the extension and the

    gravity prompt block to fall

    downwards,thus form negative

    flower structure.

A

B

C


Strike slip fault and its related structure

Strike-slip faultsystem

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


Strike slip fault and its related structure

FLOWER STRUCTURE IN STRIKE-SLIP FAULTS

Positive flower structure

for uplift blocks

Negative flower structure

for depressed blocks


Analysis of flower structure

Analysis of flower structure

  • We observe the structure carefully,it can be inferred that

    positive flower structure is a combination of reverse fault,

    whereas the negative consists of a group of normal fault.

    Several methods can be used to identify the structure

     displacement

     joint

     attitude of fault plane

     breccia

     slikenline


Kink band fault zone

Kink band&Fault zone

It is a kind of chevron fold which possesses planar limbs

and sharp angular hinges.If it is symmetrical,we call it

conjugate kink ,and if not,we call it monoclinal Kink band.

Fault zone developed in strike-slip fault is between two

boundings,As slip occurs along the fault bounding the

rock between them develops parallel en-echelon tension

cracks that give the zone an oblique foliation.


Strike slip fault and its related structure

Conjugate folds(A,B) with opposite sense of

asymmetry and polyclinal folds(C) with

variable axial surfaces


Johnson 1977 a b c 1 3

不同膝折带形成的应力状态

(据Johnson,1977)

A.对称共轭膝折带;B.非对称共轭膝折带;C.单斜膝折带;σ1.最大主应力; σ3.最小主应力


Strike slip fault and its related structure

The band is the zone in which the common short straight

limb bounded by the two adjacent fold surfaces

Markedly asymmetric chevron with a very long

limb and a very short limb

Kink band


Analysis

Analysis

  • In fact,the mechanism of en-echelon formed by strike-slip

    fault and the kink band is the same,though result is

    different.The key to this problem I think is the rock character.

    One situation is that the block is a whole that every parts is

    the same,when undergoing the slides,en-echelon is formed.

    Another situation is that the block has planar features.

    Slides would occur between two strata,thus make the stress

    outlet,and prevent it from cracking.


That all for my presentation

That’all for my presentation

Thank you very much!


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