Determination of geologic strain using randomly oriented strain markers of any shape |
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| Authors: | Pierre-Yves F Robin |
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| Institution: | Department of Geology and Erindale College, University of Toronto, Mississauga, Ont. L5L 1C6 Canada |
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| Abstract: | Strain markers are geologic bodies within a rock which, during the deformation of that rock, have retained their identity but did not differ from their surrounding material in their mechanical behaviour. In sections they appear as closed contours. If it can be assumed that there was no preferred orientation of the markers, the axial-strain ratio in a planar section can be determined. Two lines are drawn through the centre of each marker, parallel respectively to the two axes of the sectional strain ellipse. If aj and cj are the segments defined by the intersection of these two lines with the contour of a marker j, then the axial-strain ratio is the logarithmic average of all aj/cj. As shown in an example, this method can also be used if the markers are ellipsoids. A statistical test of initial isotropy is proposed for this special case. |
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