Strain Analysis of the Salem-Attur Shear Zone of Southern Granulite Terrane Around Salem, Tamil Nadu
Authors
-
Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai – 400 076
K. Sundaralingam -
Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai – 400 076
T. K. Biswal
-
Department of Geology, Government Arts College, Salem – 636 007
V. Thirukumaran
DOI:
https://doi.org/10.1007/s12594-017-0552-8Abstract
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.
Downloads
Metrics
Issue
Section
Downloads
Published
How to Cite
References
Berthe, D., Choukroune, P. and Jegouzo, P. (1979) Orthogneiss, mylonite and non-coaxial deformation of granites: the example of the South Armorican Shear Zone. Jour. Struct. Geol., v.1, pp.31-42.
Bhadra, B.K. (2000) Ductile shearing in Attur shear zone and its relation with Moyar shear zone, South India. Gondwana Res., v.3, pp.361-369.
Bhaskar Rao, Y.J., Janardhan, A.S., Vijaya Kumar, T., Narayana, B.L., Dayal, A.M., Taylor, P.N. and Chetty, T.R.K. (2003) Sm-Nd model ages and RbSr isotopic systematics of charnockites and gneisses across the Cauvery Shear Zone, Southern India: Implications for the Archean-Neoproterozoic Terrane Boundary in the Southern Granulite Terrain. In: M. Ramakrishnan (Ed.), Tectonics of Southern Granulite Terrain: Kuppam-Palani Geotransect. Mem. Geol. Soc. India, no.50, pp.297-317.
Bhaskar Rao, Y.J., Chetty, T.R.K., Janardhan, A.S. and Gopalan, K. (1996). Sm-Nd and Rb-Sr ages and P-T history of the Archaean Sittampundi and Bhavani layered metaanorthosite complexes in Cauvery Shear zone, South India: Evidence for Neoproterozoic reworking of Archaean crust. Contrib. Mineral. Petrol., v.125, pp.237-250.
Biswal, T.K., Jena, S.K., Datta, S., Das, R. and Khan, K. (2000) Deformation of the Terrane Boundary Shear Zone (Lakhna Shear Zone) between the Eastern Ghats Mobile Belt and the Bastar craton, in Balangir and Kalahandi districts of Orissa. Jour. Geol. Soc. India, v.55, pp.367-380.
Biswal, T.K., Thirukumaran.V, Ratre Kamleshwar, Bandyapadhaya Krishanu, Sundaralingam, K, Amit Kumar Mondal (2010) A study of mylonites from parts of the Salem-Attur Shear Zone (Tamil Nadu) and its tectonic implications. Jour. Geol. Soc. India, v.75, pp.128-136.
Blenkinsop, T. G. and Treloar, P. J. (1995). Geometry, classification and kinematics of S-C and S-C' fabrics in the Mushandike area, Zimbabwe. Jour. Struct. Geol., v.17, pp.397-408.
Chetty, T.R.K. and Bhaskar Rao, Y.J. (1998) Behavior of stretching lineation in the Salem-Attur shear belt, Southern Granulite terrane, south India. Jour. Geol. Soc. India, v.52, pp.443-448.
Chetty, T.R.K. and Bhaskar Rao Y.J. (2006) Strain pattern and deformational history in the eastern part of the Cauvery shear zone, Southern India, Jour. Asian Earth Sci., v.28, pp.46-54.
Drury, S.A. and Holt, R.W. (1980) The tectonic framework of the south Indian Craton, a reconnaissance involving Land sat imagery. Tectonophysics, v.65, pp.T-1-T15.
Erslev, E.A. and Ge, H. (1990) Least-squares center-to-center and mean object ellipse fabric analysis. Jour. Struct. Geol., v.12, pp.1047-1059.
Flinn, D. (1962) On folding during Three dimensional progressive Deformation. Quarternary Jour. Geol. Soc., v.118, pp.385-433.
Ghosh, J.G., De Wit, M.J., Zartman, R.E. (2004) Age and tectonic evolution of Neoproterozoic ductile shear zones in the Southern Granulite Terrain of India, with implications for Gondwana studies. Tectonics 23(TC3006): doi:10.1029/2002TC001444.
Ghosh, J.G., Zartman, R.E. and de wit, M.J. (1998) Re-evaluation of tectonic frame work of southern most India: new U-Pb geochronological and structural data and their implication for Gondwana reconstruction, In: Gondwana 10: Event stratigraphy of Gondwana. Jour. African Earth Sci., 27/1A, pp.86.
Harley S.L. (1989) The origin of granulites: a metamorphic perspective. Geol. Mag., v.126, pp.215-247.
Hudleston, P. (1999) Strain compatibility and shear zones: is there a problem? Jour. Struct. Geol., v.21 pp.923-932.
Jain, A.K., Singh, S. and Manickavasagam (2003) Intracontinental Shear Zones in the Southern Granulite terrane: Their kinematics and Evolution. Mem. Geol. Soc. India, no.50, pp.225-253.
Lister, G.S. and Snoke, A.W. (1984) S¯ C mylonites. Jour. Struct. Geol., v.6, pp.617¯ 638.
Mawer, C.K. (1983) State of strain in a quartzite mylonite, Central Australia. Jour. Struct. Geol, v.5, pp.401-409.
Mc Naught (1994) Modifying the normalized Fry method for aggregates of non-elliptical grains. Jour. Struct. Geol., v.16, pp.493-503.
Naha, K. and Srinivasan, R. (1996) Nature of Moyar and Bhavani shear zone with a note on its implication on the tectonics of the southern Indian Peninsula shield. Proc. Acad. Sci. (Earth Planet.Sci), v.105, pp.173-189.
Platt, J. P. (1984) Secondary cleavages in ductile shear zones. Jour. Struct. Geol., v.6, pp.439-442.
Ramakrishnan M. and Vaidyanathan, R. (2008) Geology of India. Geological Society of India, Bangalore, v.1, pp.367.
Ramsay, J.G. (1980) Shear zone geometry: a review. Jour. Struct. Geol., v.2, pp.83-99.
Ramsay, J.G. and Huber, M.I. (1983) The techniques of modern structural geology, volume 1. Strain analysis. Academic Press, London, 296p.
Ramsay, J.G. and Huber, M.I. (1987) The techniques of modern structural geology, volume 2. Folds and fractures. Academic Press, London, 686p.
Ramsay, J.G. (1967) Folding and Fracturing of the rocks. McGraw Hill, New York, 568p.
Ramsay J.G., and Wood D S (1973) The geometric effects of volume change during deformation processes; Tectonophys., v.13, pp.163-271.
Reddy, B.M., Janardhan, A.J. and Peucat, J.J. (1995) Geochemistry, age and origin of alkaline and ultramafic rocks of Salem, Tamil Nadu, South India. Jour. Geol. Soc. India, v.45, pp.251-262.
Satheesh Kumar, R. and Prasannakumar, V. (2009) Fabric evolution in SalemAttur Shear Zone, South India, and its implications on the kinematics. Gondwana Res. v.16, pp.37-44.
Sundaralingam K., Bert De Waele, Thirukumaran, V., Thakur, S.S. Tanushree Mahadani, Biswal, T.K. (2012) Deformation, Metamorphism and Geochronology of the Palaeoproterozoic Salem-Namakkal Fold Thrust Belt and Implication for the Gondwanaland Continental Assembly. Internat. Jour. Geol., Earth and Environ. Sci., v.2, pp.266-283.
Valdiya, K.S. (1998) Late Quaternary movement and landscape rejuvenation in SE Karnataka and adjoining TN in south Indian shield. Jour. Geol. Soc. India, v.51, pp.139-166.
Watterson, J. (1968) Homogeneous deformation of the gneisses of Vesterland, south-west Greenland. Meddelelser Om Grí¸nland v.175, pp.1-75.
Yellappa, T., Santosh, M., Chetty, T.R.K., Kwon, S., Park, C., Nagesh, P., Mohanty, D.P. and Venkatasivappa, V. (2012) A Neoarchean dismembered ophiolite complex from southern India: geochemical and geochronological constraints on its suprasubduction origin. Gondwana Res., doi:10.1016/ j.gr.2011.05.003.
