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38. in an upright fold the attitude of bedding at the hinge is 146'/50° sw. what is theattitude of the fold axis? (instruction: write answer in this format: 20,
38. In an upright fold the attitude of bedding at the hinge is 146'/50° SW. What is theattitude of the fold axis? (instruction: write answer in this format: 20, 180; where 20 isthe plunge of fold axis and 180 is the direction of plunge of the fold axis)
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Sajan sarthak
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IF IT IS AN UPRIGHT FOLD THEN THE AXIAL PLANE IS TO BE VERTICAL. THE BED AT THE HINGE ARE HAVE ATTITUDE 146/50 DEGREE SW . FROM THIS WE CAN INTERPRET THE FOLD IS A PLUNGING FOLD. SO THE PLUNG OF THE FOLD AXIS WILL BE SAME AS OF BED DIP AT HINGE AREA .50 DEGREE. 146 is the trend . 50/146 .
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Rahul kumar Best Answer
The attitude of hinge line in case of fold is equal to dip direction of the bedding at the hinge. The given dip direction of bedding at the hinge is 236 (=146+90). So, the attitude of hinge line is 236 and plunge amount is 50° (equal to the dip amount of bed at the hinge).