Abstract
Kaladgi basin aging palaeoproterozoic to neoproterozoic is an area of intriguing geological past. The basin had been under various phases of deformation for which emphatic evidences have been thoroughly studied which includes the field structural data, finite strain analysis and microtectonics to unveil the geological history of the basin. Whenever the intensity of deformation is evidently high, it penetrates to the microlevel and is pronounced well in the grains, which are studied under thin sections. In present study, an approach is made to unravel the patterns, and phases of deformation are studied. A total of nine oriented samples from the study area were subjected to analysis under microscope as thin sections and penetrative microstructures were noted down. Later, these samples were analysed for Strain using EllipseFit software. Considering the Rf/ϕ method for Strain analysis using Flinn Plot, Fry Plot and, Hsu Plot the patterns of the Rs XZ ranges from 1.09 to 1.78 and Rs YZ ranges from 1.05 to 1.69 indicating moderately high strain in the rocks of the area. The analysis of the strained quartz grains shows apparent flattening (0 < K < 1) with respect to the deformation temperature, the area has undergone moderate to moderately high deformation grade condition (moderate to high deformation temperature 250 °C to > 500 °C). Overall, the area has subjected to two phases of deformation, i.e. indicated by the secondary fillings in many grains. The time relation between the crystallization and deformation indicates that the rocks exposed are showing pre-kinematic crystallization.
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Pujar, A.G., Hanji, C.P., Dharek, M.S. et al. Implication of stress behaviour in the rocks exposed along Markhandaya River, with a special emphasis on microstructures and deformation temperature, Gokak, India. Innov. Infrastruct. Solut. 7, 268 (2022). https://doi.org/10.1007/s41062-022-00864-2
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DOI: https://doi.org/10.1007/s41062-022-00864-2