Abstract
Salem-Attur shear zone in the Southern Granulite Terrane demarcates the tectonic boundary between Archaean granulites of Dharwar craton and the Palaeoproterozoic granulites of Salem area. The shear zone marks a low angle thrust which has been steepened at places due to late stage folding. Static recrystallisation during late stage folding has removed the strain marker of mylonites to large extent. However, in a few places S-C angle and porphyroclasts are preserved and have been used to compute the strain. The strain shows apparent flattening by simple shear deformation with 35 % volume loss. A minimum displacement along the thrust has been computed to be 2.7 km. The strain k values increases with r suggesting the strain approaching towards prolate field with increase in strain intensity. The above study suggests the Salem-Attur shear zone is a thrust with low to moderate deformation and volume loss.
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Sundaralingam, K., Biswal, T.K. & Thirukumaran, V. Strain analysis of the Salem-Attur shear zone of Southern Granulite Terrane around Salem, Tamil Nadu. J Geol Soc India 89, 5–11 (2017). https://doi.org/10.1007/s12594-017-0552-8
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DOI: https://doi.org/10.1007/s12594-017-0552-8