Folds in multilayered rocks of Proterozoic age,Rajasthan, India |
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| Authors: | A M Bhola B K Sharma S K Ghosh |
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| Institution: | (1) Department of Geology, University of Delhi, 110 007 Delhi, India |
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| Abstract: | First phase folds F1 developed in polydeformed Ajabgarh Group rocks of Proterozoic age are studied using various geometrical methods of analysis
for compatibility of homogeneous strain in both class 1–3 pairs by correlatingt′
ga/α plots with existing curves for competent layers and matchingt
ga/α plots with the flattening curves for the incompetent layers.
F1 folds were initiated by the process of buckling but underwent (λ2/λ1) = 0.2 to 0.7] for competent layers andR- values of 1.1 to 5 for incompetent layers. The varying flattening is also revealed by the geometry of folds. The apparent
buckle shortening of folds which ranges between 49 and 67 per cent with a majority of the folds having shortening values between
50% and 55% (exclusive of layer parallel strain) and inverse thickness method strain up to 50%. Besides flattening, the fold
geometry was also modified by the pressure solution. This is borne by the presence of dark seams rich in phyllosilicates and
disseminated carbonaceous material offsetting limbs of buckled quartz veins in slates |
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| Keywords: | Structures F1 folds strain Proterozoic age Rajasthan India |
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