Abstract
The Delhi Supergroup rocks of Mesoproterozoic age in the north-eastern part of Delhi-Aravalli belt are polydeformed. These rocks show meso and micro-scale stretched quartzo-feldspathic veins in the gneissic rocks in association with marble and amphibolites in contrast to those commonly described from the low grade metamorphic rocks in the northeastern part of the Delhi-Aravalli belt. The textural features of the veins which show stretched crystals in gneisses indicate that these developed in phases episodically in the direction of mineral lineation. The veins occupy tensional cracks without shear component and developed when the fluid pressure was high enough as they form in amphibolite facies of metamorphism.
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Beckar, A. and Gross, M. R. (1999) Sigmoidal wall-rock fragments: application to the origin, geometry and kinematics of en-echelon vein arrays. Jour. Struct. Geol., v.21, pp.703–710.
Bhola, A.M. and Varadarajan, S. (1981) Polyphase deformation of Ajabgarh Stage rocks, Delhi Group, around Narnaul, Mahendragarh District, Haryana, India. Jour. Geol. Soc. India, v.22(4), pp.153–163.
Bhola, A.M., Varadarajan, S. and Khosla, V. (1983) Deformation structures in pegmatite, aplite and quartz veins in Delhi Group rocks. Jour. Geol. Soc. India, v.24(6), pp.269–280.
Bons, P.D. (2001) Development of crystal morphology during unitaxial growth in a progressively widening vein: I. The numerical model. Jour. Struct. Geol, v.23, pp.865–872.
Cox, S.F. and Etheridge, M.A. (1983) Crack-seal fibre growth mechanisms and their significance in the development of oriented layer silicate microstructures. Tectonophysics, v.92, pp.147–170.
Culshaw, N. and Fyson, W. (1984) Quartz ribbons in high grade gneiss: modifications of dynamically formed quartz c-axis preferred orientations by oriented grain growth. Jour. Struct. Geol., v.6, pp.663–668.
das Gupta, S.P. (1968) The structural history of the Khetri Copper belt, Jhunjhanu and Sikar districts, Rajasthan. Mem. Geol. Surv. India, v.98, pp.1–70.
Dietrich, D. and Ramsay, J.G. (1980) (Abst.) Int. conf. On the effect of deformation of rocks, Univ. of Gottingen, Gottingen., pp.85–87.
Durney, D.W. and Ramsay, J.G. (1973) Incremental strain measured by syntectonic growths. In: K.A. Delong and R. Scholten (Eds.), Gravity and Tectonics, Willey, New York, pp.67–69.
Elliott, D. (1973) Diffusion flow laws in metamorphic rocks. Geol. Soc. Amer. Bull., v.84, pp.2645–2664.
Etherdge, M.A. (1983) Differential stress magnitudes during regional deformation and metamorphism: upper bound imposed by tensile fracturing. Geology, v.11, pp.231–234
Heron, A.M. (1917) Geology of N.E. Rajputana. Mem. Geol. Surv. India. v.45, pp.1–128.
Hilgers, C and Urai, J.L. (2002) Microstructural observations on natural syntectonic fibrous veins: implications for the growth process. Tectonophysics, v.352, pp.257–274
Hilgers, C., Urai, J.L., Post, A.D. and Bons, P.D. (1997) Fibrous vein microstructures: Experimental and numerical simulation. Aardkundige Mededelingen 8, pp.107–109.
Hilgers, C., Köhn, D., Bons, P.D. and Urai, J.L. (2001) Development of crystal morphology during unitaxial growth in a progressively widening vein: II. Numerical simulations of the evolution of antitaxial fibrous veins. Jour. Struct. Geol., v.23, pp.873–885.
Kohn, D., Bons, P.D., Hilgers, C. and Passchier, C.W. (2003) Development of antitaxial strain fringes during non-coaxial deformation: an experimental study. Jour. Struct. Geol., v.25, pp.263–275.
Means, W. D. and Li, T. (2001) A laboratory simulation of fibrous veins: some first observation. Jour. Struct. Geol., v.23, pp.857–863.
Passchier, C.W. and Trouw, R. J. (2006) Microtectonics, Springer Verlag, Berlin, Heidelberg. pp.254
Ramsay, J. G. and Huber, M. L. (1983) The Techniques of Modern Structural Geology. Vol. I: Strain Analysis. Academic Press, London.
Ramsay, J. G. (1980) The crack-seal mechanism of rock deformation. Nature, v.284, pp.135–139.
Rumble, D. (1989) Evidence of fluid flow during regional metamorphism. European Jour. Mineral., v.1, pp.731–737
Spencer, S. (1991) The use of syntectonic fibres to determine strain estimates and deformation paths: an appraisal. Tectonophysics, v.197, pp.13–34.
Srivastava, D.C. and Pradhan, A. (1995) Late brittle tectonics in a Precambrian ductile belt: evidence from brittle structures in the Singhbhum Shear zone, Eastern India. Jour. Struct Geol., v.17(3), pp.385–396.
Yardley, B. W. D. (1983) Quartz veins and devolatilization in metamorphism. Jour. Geol. Soc. London, v.140, pp.657–663.
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Dinkar, G.K., Gireesh, R.V. & Bhola, A.M. Deformation pattern and vein development in Delhi Supergroup rocks, northeastern part of Delhi-Aravalli belt: Implication of late stage dilation. J Geol Soc India 81, 158–166 (2013). https://doi.org/10.1007/s12594-013-0019-5
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DOI: https://doi.org/10.1007/s12594-013-0019-5