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

Verma, Anju; Bhattacharya, A. R.

doi:10.1007/s12040-015-0540-6

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Many workers have discussed about the Kumaon Himalaya pertaining to different aspects of structure and tectonics in this region (Bhattacharya, 2008;Valdiya and Pande, 2009;Joshi and Tiwari, 2009;Agarwal et al 2010Agarwal et al , 2016Agarwal and Sharma, 2011;Bhargava, 2011;Patel et al, 2007Patel et al, , 2011Srivastava et al 2011;Verma and Bhattacharya, 2011;Jain et al 2012Jain et al , 2016Shah et al, 2012;Singh et al, 2012;Jade et al 2014;Dubey 2014;Banerjee et al 2015;Bhattacharya and Ahmed 2016)and their works have thrown much light on the tectonic evolution of the rocks of the region which are highly folded and tectonically much complex. The mesoscopic folds have been used by many workers for the analysis of the folding and the strain conditions (Dieterich and Carter, 1969;Roberts and Strömgard, 1972;Hudleston, 1973;Sanderson, 1976;Bhattacharya, 1978;Hudleston, and Holst, 1984;Lisle, 1992;Bastida, 1993;Bastida et al, 2003;Srivastava, 1995Srivastava, , 2003Srivastava and Gairola, 2003).…”

Section: Discussionmentioning

confidence: 99%

Geometric and strain analyses in folds of the area around Gankot, district Pithoragarh, Uttarakhand, India

Lata¹,

Kumar²,

Srivastava³

2019

J. Geoscience Eng. Environ. Technol.

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The study area around Gankot in Pithoragarh district of Uttarakhand belongs to the Thalkedar Limestone unit of Mandhali Formation, Tejam Group in Inner Sedimentary Zone of Lesser Himalaya, which exposes complexly folded and refolded structures. Geometric analysis carried out on the profile section of the fold tracing using dip isogon and orthogonal thickness parameters revealed presence of all the fold geometry suggested by Ramsay (1967) however the class 3 followed by class 1B are the most dominant classes in the study area when individual layers of the fold were studied. The study of folds as multilayered unit reveals that folds in study area belong to strongly non-analogous fold class of anisodeviatoric folds. In fold, the strain analysis has been done by drawing strain ellipse obtained by Inverse Thickness Method which is useful in estimating flattening strain even when the flattening is imposed obliquely to the fold’s axial trace. The finite two-dimensional flattening strain ratio (Rs) value ranged between 1 and 3.14 with an average Rs value of 1.60. The method of Srivastava and Gairola (2003) has also been used to obtain shear strain and flattening strain for the multilayered folds of study area. The results reveal that the multilayered folds around Gankot area are moderately flattened with mean flatting strain varying between 1.06 and 2.28. A very high degree of variation in shearing ranging about 70o in both clockwise and anticlockwise directions has been noticed. The shear strains (γ) in folds have been found to vary between -2.75 to + 3.27 with an average of +0.33. The shearing and strain patterns are suggestive that the most dominant folding mechanism has been the flexure-shear for the folds of the study area which are overprinted by the fold flattening and other subsequent deformations.

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Section: Discussionmentioning

confidence: 99%

Geometric and strain analyses in folds of the area around Gankot, district Pithoragarh, Uttarakhand, India

Lata¹,

Kumar²,

Srivastava³

2019

J. Geoscience Eng. Environ. Technol.

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“…Reorientation of linear structures and their low scatter in direction of bulk shear along crustal-scale MCT in Munsiari-Milam area of eastern Kumaon could be related to strong ductile shear deformation along this thrust (Verma and Bhattacharya, 2011).…”

Section: (C) Lesser Himalayan Metamorphic Beltmentioning

confidence: 98%

Tectonics and Evolution of the Himalaya

Jain

Dasgupta²,

Bhargava³

et al. 2016

Proceedings of the Indian National Science Academy

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During the period 2011-2015, scientific investigations in the Himalaya incorporated various geological and geophysical aspects of evolution of this mountain, including sub-surface configuration, structure and metamorphism of the Lesser Himalaya and Himalayan Metamorphic Belt, geochemistry, magmatism, stratigraphy and paleontology of the Paleo-Mesozoic Tethyan sedimentary cover, the Himalayan foreland basins, exhumation, paleoseismology and GPS measurements of convergence rates. Certain remote areas of western Arunachal Pradesh in Kameng were covered for their metamorphism and exhumation. Sm-Nd isochron plot of garnet crystals from the Lesser Himalayan Jutogh Group metamorphics provided a mean regression age of 479.7±8.5 Ma as the timing of its crystallization during an Early Ordovician tectonometamorphic event. High-resolution work on metamorphism of the Lesser and Higher Himalayan belts of Sikkim incorporating P-T-t paths and geochronology of the imbricate zones of the Main Central Thrust provided better insight into their evolution.

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Lineation

Bhattacharya

2022

Structural Geology

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

Cited by 6 publications

References 14 publications

Geometric and strain analyses in folds of the area around Gankot, district Pithoragarh, Uttarakhand, India

Geometric and strain analyses in folds of the area around Gankot, district Pithoragarh, Uttarakhand, India

Tectonics and Evolution of the Himalaya

Lineation

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