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Chauhan, Ritu
- Development of Transverse Fault along North Almora Thrust, Kumaun Lesser Himalaya, India: A Study Based on Field and Magnetic Fabrics
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Authors
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1 Department of Geology, Kumaun University, Nainital - 263 002, Uttarakhand, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, Uttarakhand, IN
1 Department of Geology, Kumaun University, Nainital - 263 002, Uttarakhand, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, Uttarakhand, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 5 (2012), Pagination: 429-448Abstract
Along the North Almora Thrust (NAT) in the Kumaun Lesser Himalaya, a zone of mylonitic rocks has developed due to strain localization during the tectonic emplacement of the Almora Nappe over the Lesser Himalayan Sequence. This zone is referred here as the NAT zone (NATZ) that is dissected by faults, which are transverse to the Himalayan orographic trend and are known as seismically active structures. Trending NNW-SSE these are the Chaukhutiya and Raintoli faults. Two E-W oriented subsidiary brittle faults across the Chaukhutiya Fault are also recognized. Based on the field study and magnetic fabric analysis an attempt has been made to evaluate the deformation and kinematic history of northeastern margin of the Almora Nappe superposed by the Chaukhutiya faulting that coincides with northeastern margin of the NAT. Field study reveals brittle-ductile and brittle regimes of deformation along the Chaukhutiya Fault. Away from the NAT variable attitudes (E-W or ENE-WSW with gentle dip) of field foliation and axial planes of folds are observed, whereas at and near the NAT the attitudes of beds, including curved lithounits, are steeply dipping and are oriented parallel with the NNW-SSE trending NAT. Curvature in fold hinge line and discontinuous occurrence of lithounits are observed along the fault.
Anisotropy of Magnetic Susceptibility (AMS) study of the rocks was carried out. It reveals that the anisotropy is controlled mostly by paramagnetic minerals, whereas ferromagnetic minerals have played a minor role. High temperature demagnetization through hysteresis curves has yielded negligible contribution of ferromagnetic minerals. The steep magnetic foliation is interpreted to be on account of NE-SW oriented progressive regional compression. Moreover, the magnetic foliation is inferred to represent a secondary foliation due to superimposition on primary foliation. Analyses of AMS and structural data indicate that the Chaukhutiya Fault has a strike-slip right lateral displacement including rotational component. AMS results reveal high anisotropy value (Pj) at the surface trace of the NAT and low anisotropy (Pj) away from it. Variable style of deformation is observed along the transverse fault length.
Keywords
Almora Nappe, North Almora Thrust, Chaukhutiya Fault, Anisotropy of Magnetic Susceptibility.
References
- AGARWAL, K.K.,BALI, R., PATIL, S.K. and ALI, N. (2010) Anisotropy of Magnetic Susceptibility in the Almora Crystalline Zone Lesser Himalaya, India: A case study. Jour Asian. Earth Sci., v.3(1), pp.1-10.
- AHMAD, T., HARRIS, N., BICKLE, M., CHAPMAN, H., BUNBURY, J. and PRINCE, C. (2000) Isotopic constraints on the structural relationships between the Lesser Himalayan Series and the High Himalayan Crystalline Series, Garwhal Himalaya. Geol. Soc. Amer. Bull., v.112, pp.467-477.
- AUBOURG, C., HEBERT, R., JOLIVET, L. and CARTAYRADE, G. (2000) The magnetic fabric of metasediments in a detachment shear zone: the example of Tinos Island (Greece). Tectonophysics, v.321, pp.219-236.
- BHATTACHARYA, A.R. (1999) Deformational regimes across the Kumaun Himalaya: A study in strain pattern. Gondwana Res. Mem. (Japan), v.6, pp.81-90.
- BHATTACHARYA, A.R. (2004) Rotation of linear structures in shear regime. Geoinformatics, v.15, pp.159-162.
- BORRADAILE, G.J. (1988) Magnetic susceptibility, petrofabrics, and strain: a review. Tectonophysics, v.156, pp.1-20.
- BORRADAILE, G.J. (1991) Correlation of strain with anisotropy of magnetic susceptibility (AMS). Pure and Applied Geophysics, v.135, pp.15-29.
- BORRADAILE, G.J. (2001) Magnetic fabrics and petrofabrics; their orientation distributions and anisotropies. Jour. Struc. Geol., v.23, pp.1581-1596.
- BORRADAILE, G.J. and HENRY, B. (1997) Tectonic applications of magnetic susceptibility and its anisotropy. Earth Sci. Rev., v.42, pp.49-93.
- BORRADAILE, G.J. and JACKSON, M. (2004) Anisotropy of magnetic susceptibility (AMS), magnetic petrofabrics of deformation rocks. In: F. Martin-Hernandez, C.M. Lunenburg, C. Aubourg, M. Jackson (Eds.), Magnetic Fabrics. Geol. Soc. London Spec. Publ. No.238, pp.299-360.
- BORRADAILE, G.J. and JACKSON, M. (2010) Structural geology, petrofabrics and magnetic fabrics (AMS, AARM, AIRM). Jour. Struc. Geol., v.32, pp.1519-1551.
- BORRADAILE, G.J. and WERNER, T. (1994) Magnetic anisotropy of some phyllosilicates. Tectonophysics, v.235, pp. 223-248.
- CELERIER, J., HARRISON, T.M., YIN, A. and WEBB, A.A.G. (2009) The Kumaun and Garwhal Lesser Himalaya, India. Part 1: Structure and stratigraphy. Geol. Soc. Amer. Bull., v.121, pp.1262-1280.
- DECELLES, P.G., ROBINSON, D.M., QUADE, J., OJHA, T.P., GARZIONE, C.N., COPELAND, P. and UPRETI, B.N. (2001) Stratigraphy, structure, and tectonic evolution of the Himalayan fold-thrust belt in western Nepal. Tectonics, v.20, pp.487-509.
- DEKKERS, M.J. (1988) Magnetic properties of natural pyrrhotite Part I: Behaviour of initial susceptibility and saturationmagnetization-related rock-magnetic parameters in a grainsize dependent framework. Phy. Earth Planet. Int., v.52, pp.376-393.
- DEKKERS, M.J. (1989) Magnetic properties of natural pyrrhotite. II. High- and low-temperature behavior of Jrs and TRM as a function of grain size. Phy. Earth Planet. Int., v.57, pp.266-283.
- DUBEY, A.K. (1997) Simultaneous development of noncylindrical folds, frontal ramps, and transfer faults in a compressional regime: Experimental investigarions of Himalayan Examples. Tectonics, v.16, pp.336-346.
- DUBEY, A.K., BHAKUNI, S.S. and SELOKAR, A.D. (2004) Structural evolution of the Kangra recess, Himachal Himalaya: a model based on magnetic and petrofabric strains. Jour. Asian Earth Sci., v.24, pp.245-258.
- DUBEY, A.K. and BHAKUNI, S.S. (2008) Neotectonic stress and active tectonics in the Garhwal Inner Lesser Himalaya: anisotropy of magnetic susceptibility studies. Him. Geol., v.29, pp.35-47.
- GANSSER, A. (1964) Geology of the Himalayas. Interscience Publishers, London, 273p.
- GOSWAMI, P.K. and PANT, C.C. (2008) Morphotectonic evolution of the Binau–Ramganga–Naurar transverse valley, southern Kumaun Lesser Himalaya. Curr. Sci., v. 94(12), pp.1640-1645.
- HALLWOOD, E.A., MADDOCK, R.K., FUNG, T. and RUTTER, E.H. (1992) Paleomagnetic analysis of fault gouge and dating fault movement, Anglesey, North Wales. Jour. Geol. Soc. London, v.149, pp.273–84.
- HENRY, B. (1990) Magnetic fabric implications for the relationships between deformation mode and grain growth in slates from the Borrowdale Volcanic Group in the English Lake District. Tectonophysics, v.178, pp.225-230.
- HENRY, B. (1992) Modelling the relationship between magnetic fabric and strain in polymineralic rocks. Phy. Earth Planet. Int., v.70, pp.214-218.
- HROUDA, F. (1982) Magnetic anisotropy of rocks and its application in geology and geophysics. Geophy. Surv., v.5, pp.37-82.
- HROUDA, F. (1994) A technique for the measurement of thermal changes of magnetic susceptibility of weakly magnetic rocks by the CS-2 apparatus and KLY-2 Kappabridge. Geophys. Jour. Internat., v.118, pp.604-612.
- HROUDA, F., TABORSKA, S., SCHULMANN, K., JE•EK, J. and DOLEJŠ (1999) Magnetic fabric and rheology of co-mingled magmas in the Nasavrky Plutonic Complex (E Bohemia): implications for intrusive strain regime and emplacement mechanism.
- HROUDA, F. and ULLEMEYER, K. (2001) Quantitative correlation of biotite lattice preferred orientations and magnetic fabrics in granulites from the Southern Bohemian Massif. Z. dt. Geol. Ges., v.152, pp.547-61.
- JAYANGONDAPERUMAL, R. and DUBEY, A.K. (2001) Superposed folding of blind thrust and formation of klippen: results of anisotropic magnetic susceptibility from the Lesser Himalaya. Jour. Asian Earth Sci. v.19, pp.713-725.
- JAYANGONDAPERUMAL, R., DUBEY, A.K. and SEN, K. (2010) Mesoscopic and magnetic fabrics in arcuate igneous bodies: an example from the Mandi-Karsog pluton, Himachal Lesser Himalaya. Geol. Mag., v.147, pp.652-664.
- JELÍNEK, V. (1981) Characterization of the magnetic fabrics of rocks. Tectonophysics, v.79, pp.63-67.
- JOSHI, M. (1999) Evolution of the Basal Shear Zone of the Almora Nappe, Kumaun Himalaya. Mem. Gondwana Res. Mem., v.6, pp.69-80.
- JOSHI, M. and TIWARI, A.N. (2004) Quartz C-axes and metastable phases in the metamorphic rocks of Almora Nappe: evidence of pre-Himalayan signatures. Curr. Sci., v.87, pp.995-999.
- JOSHI, M. and TIWARI, A. N. (2009) Structural events and metamorphic consequences in Almora Nappe, during Himalayan collision tectonics. Jour. Asian Earth Sci., v.34, pp.326-335.
- KAILA, K.L., GAUR, V.K. and NARAIN, H (1972) Quantitative seismically maps of India. Bull. Seismol. Soc. Amer., v.62, pp.1119-1132.
- KRISHNASWAMY, V.S., JALOTE, S.P. and SHOME, S.K. (1970) Recent crustal movements in the northwest Himalaya and the Gangetic foredeep and related pattern of seismicity. Proc.. 4th. Symp. Earthquake Engg., Roorkee University, Roorkee, pp.419-339.
- KOTHYARI, G.C. and PANT, P.D. (2008) Evidences of Active Deformation in the Northwestern part of Almora, in Kumaun Lesser Himalaya: A Geomorphic perspective. Jour. Geol. Soc. India, v.72, pp.353-364.
- MAJUMDER, S. and MAMTANI, M.A. (2009) Magnetic fabric in the Malanjkhand Granite (Central India)- Impliacations for regional tectonics and Proterozoic Suturing of Indian shield. Physics Earth Planet. Interiors, v.172, pp.310-323.
- MAMTANI, M.A. and GREILING, R.O. (2005) Granite emplacement and its relation with regional deformation in the Aravalli Mountain Belt (India) - inferences from magnetic fabric. Jour. Struc. Geol., v.27, pp. 2008-2029.
- MAMTANI, M.A. and SENGUPTA, A. (2009) Anisotropy of magnetic susceptibility analysis of deformed kaolinite: implications for evaluating landslides. Internat. Jour. Earth Sci., v. 98, pp. 1721-1725
- MAMTANI, M.A. and SENGUPTA, A. (2010) Significance of AMS analysis in evaluating superposed folds in quartzites. Geol. Mag., v.147, pp.910-918.
- MOLNAR, P. and TAPPONNIER, P. (1975) Cenozoic tectonics of Asia: Effects of a continental collision. Science, v.189, pp.419-426.
- MUKHERJI, M.A., CHAUDHURI, A.K. and MAMTANI, M.A. (2004) Regional scale strain variations in Banded Iron Formations of eastern India: results from anisotropy of magnetic susceptibility studies. Jour. Struc. Geol., v.26, pp.2175-2189.
- NAKAMURA, N. and NAGAHAMA, H. (1997) Anisotropy of magnetic susceptibility and plastic strain of rocks:A Finsler geometrical approach. Acta Geophysica Polonica, v.45, pp.333-54.
- NAKAMURA, N. and NAGAHAMA, H. (2001) Changes in magnetic and fractal properties of fractured granites near the Nojima Fault, Japan. The Island Arc, v.10, pp.486-494.
- NAKAMURA, N. and BORRADAILE, G. J. (2004) Metamorphic control of magnetic susceptibility and magnetic fabrics: a 3-D projection. Geol. Soc. London Spec. Publ., v.38, pp.61-68.
- OZIMA, M. and KINOSHITA, H. (1964) Magnetic anisotropy of andesites in a fault zone. Jour. Geomagnetism and Geoelectricity. v.16, pp.194-200.
- PANT, P.D., KOTHYARI, G.C. and LUIREI, K. (2007) Geomorphic evidences of neotectonic activity from a part of North Almora Thrust, between Seraghat – Basoli section in central Kumaun, Uttaranchal, India. Jour. Geol. Soc. India., v.70, pp.815-823.
- PAUL, A., BHAKUNI, S.S., PANT, C.C., DARMWAL, G.S. and PATHAK, V. (2010) Microseismicity in central part of Inner Kumaun Lesser Himalaya: Implication to active seisotectonics. Himalayan Geol., v.31, pp.107-115.
- RICHARDS, A., ARGLES, T., HARRIS, N., PARRISH, R., AHMAD, T.,DARBYSHIRE, F. and DRAGANITS, E. (2005) Himalayan architecture constrained by isotopic tracers from clastic sediments: Earth Planet. Sci. Lett., v.236, pp.773-796.
- ROCHETTE, P. (1987) Magnetic susceptibility of the rock matrix related to magnetic fabric studies. Jour. Struc. Geol., v.9, pp.1015-1020.
- SEN, K., MAJUMDER, S. and MAMTANI, M.A. (2005) Degree of magnetic anisotropy as a strain intensity gauge in ferromagnetic granites. Jour. Geol. Soc. London, v.162, pp.583-586.
- SEN, K. and MAMTANI, M.A. (2006) Magnetic fabric, shape preferred orientation and regional strain in granitic rocks. Jour. Struc. Geol, v.28, pp.1870-1882
- SIDMAN, D., FERRE, E. C., TEYSSIER, C. and JAKSON, M. (2005) Magnetic fabric and microstructure of a mylonite: example from the Bitterischolar_main Shear zone, Western Montana. Geol. Soc. London, Spec. Publ., v.245, pp.143-163.
- SRIVASTAVA, H.N. (1973) The crustal seismicity and the nature of faulting near India-Nepal-Tibet trijunction. Himalayan Geol., v.3, pp.381-393.
- SRIVASTAVA, P. and MITRA, G. (1994) Thrust geometries and deep structure of the outer and lesser Himalaya, Kumaun and Garhwal (India): implications for evolution of the Himalayan fold-and-thrust belt. Tectonics, v.13, pp.89-109.
- SRIVASTAVA, P. and MITRA, G. (1996) Deformational mechanism and inverted thermal profile in the North Almora Thrust mylonite zone, Kumaun Lesser Himalaya, India. Jour. Struc. Geol., v.18, pp.27-39.
- TARLING, D.H. and HROUDA, F. (1993) The magnetic anisotropy of rocks. Chapman and Hall, London, 271p.
- TRIPATHY, N.R., SRIVASTAVA, H.B. and MAMTANI, M.A. (2009) Evolution of a regional strain gradient in mylonitic quartzities from the foot wall of the main central thrust zone (Garhwal Himalya, India): Inferences from finite strain and AMS analysis. Jour. Asian Earth Sci., v.34, pp.26-37.
- VALDIYA, K.S. (1976) Himalayan transverse faults and folds and their parallelism with subsurface structures of North Indian plains. Tectonophysics, v.32, pp.353-386.
- VALDIYA, K.S. (1980) Geology of Kumaun Lesser Himalaya. WIHG, Dehradun, 291p.
- VALDIYA, K.S. (1998) Dynamic Himalaya. University Press, Hyderabad, 178p.
- VALDIYA, K.S., PAUL, S.K., CHANDRA, T., BHAKUNI, S.S. and UPADHYAY, R.C. (1999) Tectonic and lithological characterization of Himadri (Great Himalaya) between Kali and Yamuna rivers, central Himalaya. Himalayan Geol., v.20, pp. 1-17.
- VISHNU, C.S., MAMTANI, M.A. and BASU, A. (2010) AMS, ultrasonic P-wave velocity and rock strength analysis in quartzite devoid of mesoscopic foliation- implications for rock mechanics studies. Tectonophysics, v.494, pp.191-200.