rider structural geology 310 2012 gcherman faults some exercises adapted from lisle, r. j., 2004,...
TRANSCRIPT
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Rider Structural Geology 310 2012 GCHERMAN
FaultsFaults
Some exercises adapted from Lisle, R. J., 2004, Geological Structures and Maps, Practical Guide, Third edition
http://www.impacttectonics.org/gcherman/downloads/GEO310/GCH_GESymbols/GCH_GE_Geology_Apps.htm
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Rider Structural Geology 310 2012 GCHERMAN
FaultsFaults
From Simple inclined planes:
Spacing between contours = contour interval / tangent (angle of dip)
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Rider Structural Geology 310 2012 GCHERMAN
Dip separation is the bed offset in the down dip direction of the fault (Fig. 4.7). The vertical component of the dip separation is called the throw and its horizontal component is the heave; both of these quantities can be seen in a plane perpendicular to the fault’s strike. For a given fault, the ratio of the heave to the throw depends on the fault plane’s dip in this manner:
tan (dip of fault) = throw/heave (Fig. 4.7)
d
90-d
tan (90-d) = heave/throw and
tan d = throw/heave
tan 20 ~ 0.7/1.8 = 0.36
tan 70 ~ 1.8/0.7 = 2.70
1.8
0.7
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Rider Structural Geology 310 2012 GCHERMAN
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Rider Structural Geology 310 2012 GCHERMAN
~17m
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Rider Structural Geology 310 2012 GCHERMAN
From Section 43., page 61:
The stratigraphic separation is the shortest distance between two parallel planes, or the distance measured in a direction which is perpendicular to these planes.
The vertical separation is determined by selecting any point on the map and calculating the height difference of the two displaced parts of a geological surface.
For example at point x (Fig. 4.9B),
height of mudstone bed in hanging wall = –10m
height of mudstone bed in foot wall = –20m
height difference = (–10) – (–20)
= 10 m = vertical separation
the stratigraphic separation = vertical separation x cos (fault dip) =
10m 0.64 = 6.4 m.
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Rider Structural Geology 310 2012 GCHERMAN
Use the PowerPoint object tools to rotate the red line, and investigate the omission and repetition results
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Rider Structural Geology 310 2012 GCHERMAN
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Rider Structural Geology 310 2012 GCHERMAN
Fault strike / dip = 087 / 18 N
(TAN dip = 100 m / 300 m )
Bedding strike / dip = 050 / 9 N
(TAN dip = 100 m / 600 m )
40o DA deviation
Apparent dip ~ 7o
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Rider Structural Geology 310 2012 GCHERMAN
600
800
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Rider Structural Geology 310 2012 GCHERMAN
600
800YX
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Rider Structural Geology 310 2012 GCHERMAN
600
800YX Decapitation thrust fault
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Rider Structural Geology 310 2012 GCHERMAN
600
800
H
T
DS
VS
YX
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Rider Structural Geology 310 2012 GCHERMAN
STATION 76250 031/76S cut by 174/68 E w apparent left lateral offset
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Rider Structural Geology 310 2012 GCHERMAN
MAP
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W
PROFILE
E
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Rider Structural Geology 310 2012 GCHERMAN
-10
0
HOMEWORK
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Rider Structural Geology 310 2012 GCHERMAN
STATION LAT LON 76250 40.32721 -74.91455 76251 40.32744 -74.91411 76252 40.32836 -74.91278 76253 40.32912 -74.91173
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Rider Structural Geology 310 2012 GCHERMAN
http://www.impacttectonics.org/gcherman/downloads/GEO310/GCH_GESymbols/GCH_GE_Geology_Apps.htm
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Rider Structural Geology 310 2012 GCHERMAN
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Rider Structural Geology 310 2012 GCHERMAN
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Rider Structural Geology 310 2012 GCHERMAN
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Rider Structural Geology 310 2012 GCHERMAN
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Rider Structural Geology 310 2012 GCHERMAN
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Rider Structural Geology 310 2012 GCHERMAN
5070
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Rider Structural Geology 310 2012 GCHERMAN