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Dutt, Krishan
- Development of Ductile Shear Zones during Diapiric Magmatism of Nepheline Syenite and Exhumation of Granulites-Examples from Central Rajasthan, India
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Authors
Affiliations
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 H. No. 20/75, Mansarovar, Jaipur 302 020, IN
3 No. 301, A.R. Complex, I-Block, Sector-14, Hiran Magri, Udaipur 313 001, IN
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 H. No. 20/75, Mansarovar, Jaipur 302 020, IN
3 No. 301, A.R. Complex, I-Block, Sector-14, Hiran Magri, Udaipur 313 001, IN
Source
Current Science, Vol 110, No 6 (2016), Pagination: 1094-1101Abstract
The present communication discusses two separate instances where features commonly observed in DSZ are noted, one along the margin of the Kisengarh nepheline syenite and the other in the granulite bodies the Sandmata Complex in Rajasthan, India. The foliations in the nepheline syenite pluton show features similar to the mylonite gneisses that characterize DSZs in orogenic belts. Apart from simulating LS tectonite- type fabric the continuity of similar structures in adjacent cover rocks provides evidence of heterogeneous deformation during upward ascent of nepheline syenite. Based on tectono-metamorphic studies on granulites suggestion is made about the uplift of deepseated granulites accompanied by ductile shearing on along the margins. The development of DSZ along margins helped in reducing the frictional resistance during upward ascent and emplacement into Archaean gneissic terrane. The process is comparable to buoyancy- induced diapiric uplift of hot plutonic bodies through cooler upper crust.Keywords
Ductile Shear Zone, Diapiric Magmatism, Exhumation of Granulites, Emplacement of Plutonic Bodies.Full Text
References
- White, S. H., Burrows, S. E., Carreras, J., Shaw, N. D. and Humphreys, F. J. On mylonites in ductile shear zones. J. Struct. Geol., 1980, 2, 175–187.
- Lapworth, C., The highland controversy in British geology: its causes, course and consequences. Nature, 1885, 32, 558–559.
- Knopf, E. B., Retrogressive metamorphism and phyllylonitization. Am. J. Sci., 1931, 21, 1–27.
- Bell, T. H. and Etheridge, M. A., Microstructures of mylonites and their descriptive terminology. Lithos, 1973, 6, 337–348.
- Christie, J. M., The Moine Thrust in the Assym Region, North West Scotland, University of California Publications on Geological Sciences, 1963, vol. 40, pp. 345–419.
- Ramsay, J. G., Shear zone geometry: a review. J. Struct. Geol., 1980, 2, 83–99.
- Lister, G. S. and Snoke, A. W., S–C mylonites. J. Struct. Geol., 1984, 6, 617–638.
- Passchier, C. W. and Trouw, R. A. J., Microtectonics, Springer, 2005, p. 289.
- Trouw, R. A. J., Passchier, C. W. and Siersma, D., Atlas of Mylonites – and Related Microstructures, Springer, 2009, p. 322.
- Heron, A. M., Geology of central Rajputana. Mem. Geol. Surv. India, 1953, 79(1), 389.
- Roy, A. B. and Dutt, K., Tectonic evolution of the nepheline syenite and associated rocks of Kishengarh, District Ajmer, Rajasthan. Mem. Geol. Soc. India, 1995, 31, 231–257.
- Heron, A. M., The soda-bearing rocks of Rajputana. Rec. Geol. Surv. India, 1924, 56, 179–197.
- Niyogi, D., Structural patterns of Kishengarh alkaline rocks. Q. J. Geol. Min. Metall. Soc. India, 1960, 77, 27–38.
- DeSitter, L. U., Structural Geology, McGraw-Hill, 1964, p. 552.
- Roy, A. B., Kröner, A., Bhattachaya, P. K. and Rathore, S., Metamorphic evolution and zircon geochronology of the early Proterozoic granulites from the Aravalli Mountains of northwestern India. Geol. Mag., 2005, 143(3), 286–298.
- Roy, A. B., Kröner, A., Rathore, S., Laul, V. and Purohit, R., Tectono-metamorphic and geochronologic studies from Sandmata Complex, northwest Indian Shield: implications on exhumation of late-Palaeoproterozoic granulites in an Archaean–early Palaeoproterozoic granite–gneiss terrane. J. Geol. Soc. India, 2012, 79, 323– 334.
- Naha, K. and Roy, A. B., The problem of the Precambrian basement in Rajasthan, western India. Precambrian Res., 1983, 19, 217–223.
- Roy, A. B. and Kröner, A., Single zircon evaporation ages constraining the growth of the Archaean Aravalli craton, northwestern Indian shield. Geol. Mag., 1996, 133(3), 333–342.
- Sharma, Precambrian of the Aravalli Mountains, Rajasthan, India. Mem. Geol. Soc. India, 1988, 7, 33–76.
- Sharma, R. S., Cratons and Fold Belts of India, Lecture Notes in Earth Sciences, Springer Verlag, 2010, vol. 127, p. 304.
- Roy, A. B. and Purohit, R., Lithostratigraphic, geochronological and depositional framework of the Precmbrian basins of the Aravalli Mountains and adjoining areas, Rajasthan, India. Mem. Geol. Soc. India, 2015, 43, 55–65.
- Bhowmik, S. K., Bernhardt, H.-J. and Dasgupta, S., Grenvillian age high-pressure upper amphibolite–granulite metamorphism in the Aravalli–Delhi Mobile Belt, northwestern India: new evidence from monazite chemical age and its implication. Precambrian Res., 2010, 178, 168–184.
- Saha, L., Bhowmik, S. K., Fukuoka, M. and Dasgupta, S., Contrasting episodes of regional granulite–facies metamorphism in enclaves and host gneisses from the Aravalli–Delhi Mobile Belt, NW India. J. Petrol., 2008, 49, 107–128.
- Dasgupta, S., Gupta, P., Sengupta, P., Miurau, H. and Aandehl, J., Pressure–temperature fluid evolutionary history of the polymetamorphic Sandmata granulite complex. Precambrian Res., 1997, 83, 267–290.
- Guha, D. B. and Bhattacharya, A. K., Continental crust of northwestern and central India. Mem. Geol. Surv. India, 1995, 31, 163– 198.
- Biju-shekar, S., Yokoyama, K., Pandit, M. K., Okudaraia, T., Yoshida, M. and Santosh, M., Late Palaeoproterozoic magmatism in Delhi Fold Belt, NW India and its implication: evidence from EPMA chemical ages of zircons. J. Asian Earth Sci., 2003, 22, 189–207.
- Buick, I. S., Allen, C., Pandit, M., Rubatto, D. and Herman, J., The Proterozoic magmatic and metamorphic history of Banded Gneissic Complex, central Rajasthan, India: ICP-MS U–Pb zircon constraints. Precambrian Res., 2006, 151, 119–142.
- Sarkar, G., Barman, T. R. and Corfu, F., Timing of continental arc magmatism in northwest India: evidence from U–Pb geochronology. J. Geol., 1989, 97, 607–612.
- Peterson, S. R., Vernon, R. H. and Tobisch, O. T., A review of criteria for the identification of magmatic and tectonic foliations in granitoids. J. Struct. Geol., 1989, 11, 349–363.
- Burov, E., Jaupart, C. and Guillou-Frottier, L., Ascent and emplacement of buoyant magma bodies in brittle–ductile upper crust. J. Geophys. Res. B, 2003, 108, 2177; doi:10.1029/ 2002JB001904
- Weinberg, R. F. and Podladchikov, Y. Y., The rise of solid-state diapirs. J. Struct. Geol., 1995, 17, 1183–1195.
- Courrioux, G., Oblique diapirism: the Criffel granodiorite/ granitezoned pluton (southwest Scotland) and its implications for geochemical features. In Origin of Granite Batholiths: Geochemical Evidence (eds Atherton, M. P. and Turney, J.), Shiva Geology Series, Orpington, 1987, p. 786.
- Holder, M. T., An emplacement mechanism for post-tectonic granites and implications for their geochemical features. In Origin of Granite Batholiths: Geochemical Evidence (eds Atherton, M. P. and Tarney, J.), Shiva Geology Series, Orpington, 1979, p. 116– 128.
- Schwerdtner, W. M., Identification of gneiss diapirs. J. Struct. Geol., 1981, 3, 90.