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<\/p>\r\nA fracture survey along a total of 11 scanlines was conducted on subvertical exposures in a massive granite quarry. The image from Google Earth at the top left of the image below shows the location of two scanlines, line 1 and line 2, whose directions are N70W and N70E, respectively. The drawings of line 1 and 2 show the fractures observed on the respective quarry walls. The two Photographs show details of the walls.<\/p>\r\n
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Photographs from Suzano, S\u00e3o Paulo, Brazil, by Am\u00e9lia Fernandes<\/p>\r\n
Fractures along these scanlines belong to sets 1, 2 and 3, as shown in the scanline sketches, Photographs, and stereogram below.<\/p>\r\n
Fracture set 1 average strike is N20E, dipping around 35o<\/span> to 40o<\/span> in line 1, or 50\u201355o<\/span> in line 2, toward NW. A distinctive characteristic of this set is that it frequently forms zones of parallel fractures as shown in Photograph (a).<\/p>\r\n Fracture set 2 average strike is the same as set 1, N20E, but it dips around 40o<\/span> toward SE. Therefore, fracture sets 1 and 2 form an angle of around 80o<\/span> to 90o<\/span> with each other. Fracture set 2 frequently abuts against set 1 and the opposite also takes place.<\/p>\r\n Whereas sets 1 and 2 are planar, set 3 (average orientation is N70W\/88SW) is wavy and includes narrow gouge zones, and its faces show subhorizontal striae lineation. Fracture sets 1 and 2 cut through set 3 and are not disturbed by it.<\/p>\r\n a) What are the types of displacements, the tectonic regimes and stress orientation that generated each of the sets? Explain your answer.<\/p>\r\n b) What can we deduce about the deformation history of the granite?<\/p>\r\n c) What are the implications of the fracture set characteristics for groundwater flow?<\/p>\r\n Click to return to where text linked to Exercise 17<\/strong><\/span><\/a><\/p>\r\n Click for solution to Exercise 17<\/strong><\/span><\/a><\/p>","rendered":" A fracture survey along a total of 11 scanlines was conducted on subvertical exposures in a massive granite quarry. The image from Google Earth at the top left of the image below shows the location of two scanlines, line 1 and line 2, whose directions are N70W and N70E, respectively. The drawings of line 1 and 2 show the fractures observed on the respective quarry walls. The two Photographs show details of the walls.<\/p>\n Photographs from Suzano, S\u00e3o Paulo, Brazil, by Am\u00e9lia Fernandes<\/p>\n Fractures along these scanlines belong to sets 1, 2 and 3, as shown in the scanline sketches, Photographs, and stereogram below.<\/p>\n Fracture set 1 average strike is N20E, dipping around 35o<\/span> to 40o<\/span> in line 1, or 50\u201355o<\/span> in line 2, toward NW. A distinctive characteristic of this set is that it frequently forms zones of parallel fractures as shown in Photograph (a).<\/p>\n Fracture set 2 average strike is the same as set 1, N20E, but it dips around 40o<\/span> toward SE. Therefore, fracture sets 1 and 2 form an angle of around 80o<\/span> to 90o<\/span> with each other. Fracture set 2 frequently abuts against set 1 and the opposite also takes place.<\/p>\n Whereas sets 1 and 2 are planar, set 3 (average orientation is N70W\/88SW) is wavy and includes narrow gouge zones, and its faces show subhorizontal striae lineation. Fracture sets 1 and 2 cut through set 3 and are not disturbed by it.<\/p>\n a) What are the types of displacements, the tectonic regimes and stress orientation that generated each of the sets? Explain your answer.<\/p>\n b) What can we deduce about the deformation history of the granite?<\/p>\n c) What are the implications of the fracture set characteristics for groundwater flow?<\/p>\n Click to return to where text linked to Exercise 17<\/strong><\/span><\/a><\/p>\n<\/p>\n