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Overburden-Induced Flattening Structure in the Himalaya: Mechanism and Implication


Affiliations
1 Department of Geology, University of Calcutta, Kolkata 700 019, India
2 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, India
 

Small-scale structures in fold-thrust belt are mainly formed in response to the emplacement of thrust sheets. However, some small-scale structures may not be developed directly in response to the emplacement of thrust sheets, but might be genetically tied with the orogenic process. Metre- to centimetre-scale late-stage folds on foliation in phyllite with near-recumbent fold geometry are selectively developed with a specific spatial distribution, particularly in places where the foliation is steeply dipping, in the Ramgarh thrust sheet in the Darjiling-Sikkim Himalaya. The recumbent-fold structures appear to have been formed in response to overburden-induced vertical compressive deformation on steep dipping foliation, especially in the subvertical southern limb of the antiformal structure of the Lesser Himalayan Duplex in the Darjiling-Sikkim Himalaya. The role of gravity and overburden in the formation of these structures from worldwide orogenic belts may be considered to validate their genesis.

Keywords

Orogeny, Overburden-Induced Flattening, Recumbent Fold, Thrust Sheet.
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  • Mitra, G., Hull, J. M., Yonkee, W. A. and Protzman, G. M., Comparison of mesoscopic and microscopic deformational styles in the Idaho–Wyoming thrust belt and the Rocky Mountain foreland. Geol. Soc. Am. Mem., 1988, 71, 119–142.

  • Platt, T. P. and Lister, G. S., Structural history of high-pressure metamorphic rocks in the southern Vanoise massif, French Alps, and their relation to alpine tectonic events. J. Struct. Geol., 1985, 7, 19–35.

  • Artyushkov, E. V. and Baer, M. A., Mechanism of continental crust subsidence in fold belts. The Urals, Appalachians and candinavian Caledonides. Tectonophysics, 1983, 100, 5–42.

  • Mitra, G. and Yonkee, W. A., Relationship of spaced cleavage to folds and thrusts in the Idaho–Utah–Wyoming thrust belt. J. Struct. Geol., 1985, 7, 361–373.

  • Schwan, W., In Shortening Structures in Eastern and Northwestern Himalayan Rocks (ed. Saklani, P. S.), Today and Tomorrow’s Printers and Publishers, New Delhi, 1980, p. 62.

  • Srivastava, P. and Mitra, G., Thrust geometries and deep structure of the outer and Lesser Himalaya, Kumoan and Garhwal (India): implications for evolution of the Himalayan fold and thrust belt. Tectonics, 1994, 13, 89–109.

  • DeCelles, P. G., Robinson, D. M., Quade, J., Ojha, T. P., Garzione, C. N., Copeland, P. and Upreti, B. N., Stratigraphy, structure, and tectonic evolution of the Himalayan fold–thrust belt in western Nepal. Tectonics, 2001, 20, 487–509.

  • Matin, A. and Mukul, M., Phases of deformation from crosscutting structural relationships in external thrust sheets: insights from small-scale structures in the Ramgarh thrust sheet, Darjiling Himalaya, West Bengal. Curr. Sci., 2010, 99, 1369–1377.

  • Mitra, G. and Bhattacharyya, K., The use of cleavage-bedding relations and mesoscopic structures in interpreting complex duplex geometries in fold–thrust belts. Examples from the Rangit Duplex, Sikkim Himalaya. J. Himalayan Geol., 2011, 32, 25–42.

  • Sepehr, M., Cosgrove, J. and Moien, M., The impact of cover rock rheology on the style of folding in the Zagros fold–thrust belt. Tectonophysics, 2006, 427, 265–281.

  • Rubinkiewicz, J., Fold–thrust belt geometry and detailed structural evolution of the Silesian nappe–eastern part of the Polish Outer Carpathians (Bieszczady Mts.). Acta Geol. Pol., 2007, 57, 479– 508.

  • Bucher, W. H., Role of gravity in orogenesis. Geol. Soc. Am. Bull., 1956, 67, 1295–1318.

  • Gansser, A., Geology of the Himalayas, Interscience Publ., London, 1964, p. 269.

  • Yin, A., Cenozoic tectonic evolution of the Himalayan orogen as constrained by along-strike variation of structural geometry, exhumation history, and foreland sedimentation. Earth Sci. Rev., 2006, 76, 1–131.

  • Bhattacharyya, K. and Mitra, G., A new kinematic evolutionary model for the growth of a duplex – an example from the Rangit duplex, Sikkim Himalaya, India. Gond. Res., 2009, 16, 697–715.

  • Schelling, D. and Arita, K., Thrust tectonics, crustal shortening, and the structure of the far-eastern Nepal Himalaya. Tectonics, 1991, 10, 851–862.

  • Valdiya, K. S., Geology of Kumaun Lesser Himalaya, Wadia Institute of Himalayan Geology, Dehra Dun, 1980.

  • Ray, S. K., Bandyopadhyay, B. K. and Razdan, R. K., Tectonics of a part of the Shumar allochthon in eastern Bhutan. Tectonophysics, 1989, 169, 51–58.

  • DeCelles, P., Gehrels, G., Quade, J., Ojha, T., Kapp, P. and Upreti, B., Neogene foreland basin deposits, erosional unroofing, and the kinematic history of the Himalayan fold–thrust belt, western Nepal. Geol. Soc. Am. Bull., 1998, 110, 2–21.

  • DeCelles, P. G., Robinson, D. M. and Zandt, G., Implications of shortening in the Himalayan fold–thrust belt for uplift of the Tibetan Plateau. Tectonics, 2002, 21, 1211–1225.

  • Pearson, O. N. and DeCelles, P. G., Structural geology and regional tectonic significance of the Ramgarh thrust, Himalayan fold–thrust belt of Nepal. Tectonics, 24, TC4008; doi: 4010.1029/2003TC001617.

  • McQuarrie, N., Robinson, D., Long, S., Tobgay, T., Grujic, D., Gehrels, G. and Ducea, M., Preliminary stratigraphic and structural architecture of Bhutan: Implications for the along strike architecture of the Himalayan system. Earth Planet. Sci. Lett., 2008, 272, 105–117.

  • Long, S., McQuarrie, N., Tobgay, T., Rose, C., Gehrels, G. and Grujic, D., Tectonostratigraphy of the Lesser Himalaya of Bhutan: implications for the along-strike stratigraphic continuity of the northern Indian margin. Geol. Soc. Am. Bull., 2011, 123, 1406–1426.

  • Sinha Roy, S., Tectonic evolution of the Darjeeling Himalayas. Q. J. Geol. Min. Metall. Soc. India, 1967, 48, 167–178.

  • Sinha-Roy, S., Himalayan Main Central Thrust and its implications for Himalayan inverted metamorphism. Tectonophysics, 1982, 84(2), 197–224.

  • Acharyya, S., The Cenozoic foreland basin and tectonics of the eastern sub-Himalaya: problems and prospects. Himalayan Geol., 1994, 15, 3–21.

  • Mukul, M., The geometry and kinematics of the Main Boundary Thrust and related neotectonics in the Darjiling Himalayan foldandthrust belt, West Bengal, India. J. Struct. Geol., 2000, 22, 1261–1283.

  • Basak, K. and Mukul, M., Deformation mechanisms in the South Kalijhora Thrust and thrust sheet in the Darjiling Himalayan foldandthrust belt, West Bengal, India. Indian J. Geol., 2000, 72(2), 143–152.

  • Mitra, G., Bhattacharyya, K. and Mukul, M., The Lesser Himalayan Duplex in Sikkim: implications for variations in Himalayan shortening. J. Geol. Soc. India, 2010, 75, 289–301.

  • Ghosh, A., Recent advances in the geology and structure of Eastern Himalaya. In Proceeding Indian Science Congress, Agra, 1956, pp. 85–99.

  • Raina, V., The Rangit tectonic window, Stratigraphy, structure and tectonic interpretation and its bearing on the regional stratigraphy. Proceeding Himalayan Geology Seminar, New Delhi, 1976, pp. 36–43.

  • Gangopadhyay, P. and Ray, S., Tectonic framework of the Rangit window around Namchi, South Sikkim. Himalayan Geol., 1980, 10, 338–353.

  • Roy, K. K., Some problems on stratigraphy and tectonics of Darjeeling and Sikkim Himalayas. Geol. Surv. India, Misc. Publ., 1976, 24(2), 279–304.

  • Rutter, E. H. and Elliott, D., The kinetics of rock deformation by pressure solution. Philos. Trans. R. Soc. London, 1976, 283(1312), 203–219.

  • Mehdi, M., Kumar, S. and Pant, N. C., Low grade metamorphism in the Lalsot–Bayana sub-basin of the North Delhi Fold Belt and its tectonic implication. J. Geol. Soc. India, 2015, 85(4), 397–410.

  • Krandiotis, P. and MacLean, W. H., Systematics of chlorite alteration at the Phelps Dodge massive sulfide deposit. Matagami, Quebec. Econ. Geol., 1987, 82, 1898–1911.

  • Artyushkov, E. V., Stresses in the lithosphere caused by crustal thickness inhomogeneities. J. Geophys. Res., 1973, 78(32), 7675– 7708.

  • Froitzheim, N., Formation of recumbent folds during synorogenic crustal extension (Austroalpine nappes, Switzerland). Geology, 1992, 20(10), 923–926.

  • Banerjee, S., Matin, A. and Mukul, M., Overburden induced flattening deformation in Ramgarh Thrust – insight from Sikkim Himalaya. In Proceeding Indian Science Congress, Kolkata, 2013, p. 62.

  • Jones, C. H., Unruh, J. R. and Sonder, L. J., The role of gravitational potential energy in active deformation in the southwestern United States. Nature, 1996, 381, 37–41.

  • Petrini, K. and Podladchikov, Y., Lithospheric pressure-depth relationship in compressive regions of thickned crust. J. Metamorph. Geol., 2000, 18(1), 67–78.

  • Flesch, L. M., Holt, W. E., Haines, A. J. and Shen-Tu, B., Dynamics of the Pacific–North American plate boundary in the Western United States. Science, 2000, 287, 834–836.

  • Avigad, D., Ziv, A. and Garfunkel, Z., Ductile and brittle shortening, extension‐parallel folds and maintenance of crustal thickness in the central Aegean (Cyclades, Greece). Tectonics, 2001, 20(2), 277–287.

  • Rey, P., Vanderhaeghe, O. and Teyssier, C., Gravitational collapse of the continental crust: definition, regimes and modes. Tectonophysics, 2001, 342, 435–449.

  • Maxelon, M. and Mancktelow, N. S., Three-dimensional geometry and tectonostratigraphy of the Pennine zone, Central Alps, Switzerland and Northern Italy. Earth Sci. Rev., 2005, 71, 171–227.

  • Malavieille, J., Kinematics of compressional and extensional ductile shearing deformation in a metamorphic core complex of the northeastern Basin and Range. J. Struct. Geol., 1987, 9(5), 541– 554.

  • Ray, S. K., Significance of forelimb folds in the Shumar allochthon, Lesser Himalaya, eastern Bhutan. J. Struct. Geol., 1991, 13(4), 411–418.

  • Haxby, W. F. and Turcotte, D. L., Stresses induced by the addition or removal of overburden and associated thermal effects. Geology, 1976, 4(3), 181–184.

  • Fertl, W. H., Abnormal Formation Pressures: Developments in Petroleum Science, Elsevier, New York, 1976, vol. 2, p. 382.

  • Zhao, J., Labiouse, V., Dudt, J. P. and Mathier, J. F., Rock Mechanics in Civil and Environmental Engineering, CRC Press, 2010, p. 884.

  • Ramberg, H., The role of gravity in orogenic belts. Geol. Soc. Spec. Publ., 1981, 9, 125–140.


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  • Overburden-Induced Flattening Structure in the Himalaya: Mechanism and Implication

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Authors

Sayandeep Banerjee
Department of Geology, University of Calcutta, Kolkata 700 019, India
Abdul Matin
Department of Geology, University of Calcutta, Kolkata 700 019, India
Malay Mukul
Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, India

Abstract


Small-scale structures in fold-thrust belt are mainly formed in response to the emplacement of thrust sheets. However, some small-scale structures may not be developed directly in response to the emplacement of thrust sheets, but might be genetically tied with the orogenic process. Metre- to centimetre-scale late-stage folds on foliation in phyllite with near-recumbent fold geometry are selectively developed with a specific spatial distribution, particularly in places where the foliation is steeply dipping, in the Ramgarh thrust sheet in the Darjiling-Sikkim Himalaya. The recumbent-fold structures appear to have been formed in response to overburden-induced vertical compressive deformation on steep dipping foliation, especially in the subvertical southern limb of the antiformal structure of the Lesser Himalayan Duplex in the Darjiling-Sikkim Himalaya. The role of gravity and overburden in the formation of these structures from worldwide orogenic belts may be considered to validate their genesis.

Keywords


Orogeny, Overburden-Induced Flattening, Recumbent Fold, Thrust Sheet.

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DOI: https://doi.org/10.18520/cs%2Fv109%2Fi10%2F1814-1821