GeologyRocksgeological situation
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Hello and welcome to GR! I
Tue, 07/17/2007 - 09:06Hello and welcome to GR!
I think you're not quite thinking in 3D enough. The folds may well have their main fold axis parallel to the direction of folding. You're looking at a 2D face on the folds and it's tricky to get a sense of the true direction from that. It could also be a "kink" in the fold direction - elsewhere they may well be parallel.
Also, the thrust might not move in the same direction each time there is movement. It could have moved differently at the time those folds were created.
Finally, the folds may have been formed prior to thrusting and therefore unrelated to the fault.
It would take more detailed mapping in the area (which area is it by the way?) to unravel this further.
Hope that helps.
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geological situation
Submitted by rizkad on Mon, 07/16/2007 - 18:50.hey there, i'm puzzled by a geological situation i have encountered. the following photo is a photo of it, it's not the best, but the general overview is there:
http://i208.photobucket.com/albums/bb261/rizkad/help.jpg
it is 3 quartzite folds of about 10m each in length, with the middle one much smaller ~3m, they appear to have been over thrusted by a granite (red in next picture), during thrusting itself the top of the quartzite (black) and appears to have fractured the quartzite on the top (green in the next picture)
http://i208.photobucket.com/albums/bb261/rizkad/help2.jpg
the only problem i'm having is that surely if direction of thrust is from left to right on the page (which i think it is) sureley the fold directions should be in the same orientation as thrusting?
any help would be greatly appreciated. thanks