Influence of differential basement mobility on contrasting structural styles in the cover rocks: An example from Early Precambrian rocks east of Udaipur,Rajasthan |
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| Authors: | A B Roy D K Nagori |
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| Institution: | (1) Department of Geology, M L Sukhadia University, 51 Saraswati Marg, 313001 Udaipur, India |
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| Abstract: | Detailed structural and lithological mapping of the Aravalli rocks overlying the Mewar Gneiss in the area east of Udaipur,
Rajasthan, suggests presence of blocks bounded by faults, showing a contrasting structural pattern. The contrast is reflected
in the differential development and in the orientation of AF1, AF2 and AF4 folds in different blocks. In the central Umra
block, the rocks constitute a virtually homoclinal sequence showing one dominant orientation of bedding and axial planar schistosity.
Fold axes, lineations andβ orientations indicate presence of reclined folds of AF1 generation. AF2 folds are either absent or have developed only locally.
The two other blocks which border the Umra block show development of large AF2 synforms and local minor antiforms having N-S
or NNE-SSW trend. The folds interfere with AF4 folds producing irregular domes and basins in the western Kanpur-Kalarwas Block
and minor plunge reversals in Bagdara-Dhamdhar Block. It is argued that the constituents of the different blocks which formed
a collage of rift basins and horsts during sedimentation, responded differentially to deforming forces because of differential
mobility of the underlying basement. |
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| Keywords: | Differential basement mobility Early Precambrian rocks structural mapping lithological mapping tectonic synthesis |
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