Boudinage in the Delhi Rocks Between Bhim and Todgarh, Rajasthan

Authors

  • R. P. S. Pahuja
     Geological Survey of India, Jaipur
  • T. V. V. G. R. K. Murty
     Department of Applied Geology, University of Saugar, Sagar

Abstract

Pegmatite veins of variable thickness occur in biotite schists and calc schists belonging to Delhi System between Bhim and Todgarh. Rectangular, barrel shaped, lozenge shaped, rotated and folded boudins have been observed in the pegmatite veins. The degree of competency contrast, the degree of strain and the direction of stresses seem to be the controlling factors in the development of boudinage. The thickness of the rock unit behaving homogeneously as a competent band in relation to degree of strain seems significant. Rotated and folded boudins have been attributed to later deformation. The development of boudinage has been shown to be a late feature of the deformation that resulted in F2 folds of this area.

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Issue

Volume 18, Issue 10, October 1977

Section

Research Papers

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Published

1977-10-01

How to Cite

Pahuja, R. P. S., & Murty, T. V. V. G. R. K. (1977). Boudinage in the Delhi Rocks Between Bhim and Todgarh, Rajasthan. Journal of Geological Society of India, 18(10), 558–562. Retrieved from https://www.geosocindia.com/index.php/jgsi/article/view/64112

References

DE SITTER, (1958) Boudins and parasitic folds in relation to cleavage and folding Geologic Mijnb., v. 20, pp. 277-286.

JONES, A. G., (1959) Vernon map-area British Columbia. Mem. Geol. Surv, Brch, Co., v. 296, pp. 1-186.

RAMSAY, J. G., (1967) Folding and fracturing of rocks. Mc Graw Hill Book Co., New York.

RAMBERG, H., (1955) Natural and experimental boudinage and pinch and swell structures. Jour. Geol., v. 63, pp. 512-526.