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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
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Sajan sarthak Best Answer
Bed is diping N 80 degree west and Trend of slicken line is N 60 degree west so angle between them is 20° Apply tan rule ,then sin rule
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Rahul kumar![best-answer]()
Answer: Plunge= 79.37°, Rake= 86° To get the plunge amount of slickenlines, apparent dip of slickenside should be measured towards N60W. tan(apparent dip) = tan(true dip) × cos(angle between true dip and apparent dip direction tan(apparent dip) = tan(80) × cos(20) = 5.33 Apparent dip= arctan(5.33) = 79.37° So, the plunge amount of lineation is 79.37° The rake of lineation on slickenside plane is 86° (measured along small circles) as shown in the attached figure.
sir in this question,slickenside surface dips n10°e,80°w.in this n10°e is true dip Or Strike?what is it.???
and 80°w is true dip amount. cos is the difference of true dip direction and apparent dip direction but why u did minus of true dip amount and direction?
10°E is the strike direction of slickenside surface and 80° is the true dip amount of slickenside surface. You can consider slickenside surface as fault plane along which slip occurs.
The true dip direction is N80W and apparent dip direction is N60W. I took the cos of angle between true dip direction (N80W) and apparent dip direction (N60W), which is equal to (80-60)= 20°
ok sir
can i use formula cos(rake)=cos(bearing)×cos(plunge) to find bearing in any problem?
pls go through my today's post where i asked of finding bearing
Yes, you can use these two formula: For plunge: sin(plunge)= sin(dip) × sin(rake) For bearing: cos(rake)= cos(bearing) × cos(plunge) See the attached figure to understand these formula.