A. V. A. Technique in Microfabric Analysis: Examples from Delhi Group at Lalsot in Northeastern Rajasthan

Authors

  • P. K. Gangopadhyay
     Department of Geology, Presidency College, Calcutta
  • T. K. Pyne
     Department of Geology, Presidency College, Calcutta

Abstract

Selected specimens of quartzite belonging to the Precambrian Delhi Group, which bear evidence of one main phase of deformation and related recrystallisation, have been studied by the A. V. A. technique. The c-axes of quartz show preferred orientation patterns which are controlled by the spatial distribution of direction groups of quartz. Recognition of the direction groups and the manner of their distribution help to predict the inherently inhomogeneous nature of the microfabric and the likely pattern of symmetry.

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Issue

Volume 19, Issue 9, September 1978

Section

Research Papers

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Published

1978-09-01

How to Cite

Gangopadhyay, P. K., & Pyne, T. K. (1978). A. V. A. Technique in Microfabric Analysis: Examples from Delhi Group at Lalsot in Northeastern Rajasthan. Journal of Geological Society of India, 19(9), 420–425. Retrieved from https://geosocindia.com/index.php/jgsi/article/view/64368

References

CHRISTIE, J. M. and RALEIGH, C. B., (1959) The origin of deformation lamellae in quartz. Amer. Jour. sci., v. 257, pp. 385-407.

CRIGGS, D. T. and BELL, J. F., (1938) Experiments bearing on the orientation of quartz in deformed rocks. Geol. Soc. America bull. v. 49, pp. 1723-46.

HERON, A. M., (1937) The Biana-Lalsot Hills in Eastern Rajputana. Rec. Geol. Survey India, v. 48, part 4, pp. 181-203.

SANDER, B., (1950) An Introduction to the Study of Fabrics of Geological Bodies: New York and London, Pergamon Press, 641 p.

TURNER, F. J. and WEISS, L. E., (1963) Structural Analysis of Metamorphic Tectonites: New York and London, McGraw Hill & Co., pp. 247-253.

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