I have many folding structure, i have the data of dip and trend of geological formation forming the flank of folds.
I want to use this data to obtain the trend and plunge of folding axis.
Can I explain the tectonic stress as perpendicular to this axis?
for sample if i Have the foldin axis is oriented N20°, can i say that the stress is N110° (20°+90°)?
thaks for responding
Hello,
Please plot your data using the freely available software (see below).
http://www.geo.cornell.edu/geology/faculty/RWA/programs/stereonet.html
Once you plot, it is easy to measure a range of things. Possibly all that you are asking for, though, you may need more than one software for your work, and luckily all is free.
Enjoy plotting
Regards
Shah
Dear Mansour,
σ1 principal stress is always perpendicular to the fold axis.
Regards
Ioannis
Assuming that the greatest principal stress axis (σ1) is perpendicular to the fold axis is generally ok, though this is not always true, for example in cases of strain partitioning or shearing etc. It depends on the complexity of the deformation. But to start with, your assumption is ok. If this does not agree with the rest of your data you can start thinking about more complex models.
Regards
George
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