a) estimate the attitude of the structures shown in each plot. b) describe the c
ID: 288038 • Letter: A
Question
a) estimate the attitude of the structures shown in each plot.
b) describe the contour pattern(girdle, point concentration)
c) with the results of part a, construct a synoptic diagram of the data.
Poles to bedding Poles to cleavage Poles to small strike-slp faultsN Figure 8-M2. Equal-area plots of structural data from a fold-thrust belt for exercise 4. (a) Poles to bedding; (b) poles to cleavage; (c) polas to small strike-slip faults 8 Equal-Area Projections and Structural Analysis 173 4. Figure 8-M2 provides several equal-area plots of structural data collected in a fold-thrust belt. If you wish, you may reduce a Schmidt net to the appropriate size to determine carefully the attitudes of the structures shown, but you should be able to estimate the attitudes of structures from the equal-arca plots (a) Estimate the attitudes of the structures shown in each plot. (b) Describe the contour pattern (e.g., a girdle, a point concentration). (c) With the resulus of part a, construct a synoptic diagram of the data.Explanation / Answer
a) Approximate attitude of the beds are :Strike- N 500 W -S 500E, Dip -150 towards North East
Attitude of cleavage: 1st set : Strike NE-SW , 800 dip towards South east
2nd set : Strike : NE-SW, 800 dip towards North west
Attitude of Strike slip faults: 1st set : Strike East-West, 800 dip towards south.
2nd set : Strike East-west, 800 dip towards north.
3rd set. Strike Northwest- Southeast , dip 800 towards northEast
4th set: Strike Northwest- Southeast , dip 800 towards southwest
b) the conour pattern is a point concentration, as the points are scattered just close to each other and do not form part of a great gircle.
c) Steps to draw a synoptic diagram. Draw the fold with dip and direction as mentioned above , mention the north south east west directions in the diagram. Draw cleavages to the the fold according to the above attitude. And finally draw the strike slip faults.
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