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Reorientation of lineation in the Central Crystalline Zone, Munsiari–Milam area of the Kumaun Greater Himalaya

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Abstract

During large scale ductile shear deformation, linear features of the rocks tend to be reoriented towards the direction of bulk shear. This is demonstrated in a crustal scale shear zone of the Himalaya, the Main Central Thrust (MCT), typically exposed in the Munsiari–Milam area of eastern Kumaun Greater Himalaya. Along the MCT, the crystalline rocks of the Greater Himalaya are thrust over the younger sedimentary belt of the Lesser Himalaya. In the study area, the scatter of lineation orientation in the vicinity of the MCT has been observed to drastically reduce within 27° in a zone of about 18 km (about 13 km in the crystalline rocks and about 5 km in the sedimentary rocks). Beyond this zone, the scatter is very high, up to 70° or more. The low scatter of lineation orientation around the MCT could be related to the strong ductile shear deformation associated with the movement along this thrust due to which the linear features got reoriented towards the direction of bulk shear. Away from this zone, ductile shearing had negligible or no effect on the rocks and, therefore, the scatter of lineation remains very high.

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Acknowledgements

The authors thank the Head, Centre of Advanced Study in Geology, University of Lucknow, for providing the working facilities. AKV thanks the University Grants Commission for the award of a Rajiv Gandhi National Fellowship.

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  1. Centre of Advanced Study in Geology, University of Lucknow, Lucknow, 226 007, India.

    A K VERMA & A R BHATTACHARYA

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  1. A K VERMA
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  2. A R BHATTACHARYA
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Correspondence to A R BHATTACHARYA.

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VERMA, A.K., BHATTACHARYA, A.R. Reorientation of lineation in the Central Crystalline Zone, Munsiari–Milam area of the Kumaun Greater Himalaya. J Earth Syst Sci 124, 449–458 (2015). https://doi.org/10.1007/s12040-015-0540-6

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  • DOI: https://doi.org/10.1007/s12040-015-0540-6

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