Fenitized Sandstones in Amba Dongar Carbonatites, Gujarat, India

Authors

  • R. N. Sukheswala
     Geology Department, St. Xavier's College, Bombay 400 001
  • S. G. Viladkar
     Geology Department, St. Xavier's College, Bombay 400 001

Abstract

Potash fenitization of sandstones of Amba Dongar carbonatite-complex was described earlier by Deans et al. in 1972. The present work mainly deals with newly found soda-fenites in carbonatites, rich in aegirine-augite, aegirine, albite and orthoclase. The chemistry of potash fenites and soda fenites (new analyses) reveals two trends in Amba Dongar fenites; (i) 'normal fenitization' in which both soda and potash have been added and (ii) predominantly potash fenitization leading to the development of potash fenites. The fenitlzing solutions were supplied by the carbonatite magmas (both sovite and ankeritic carbonatite).

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Issue

Volume 22, Issue 8, August 1981

Section

Research Papers

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Published

1981-08-01

How to Cite

Sukheswala, R. N., & Viladkar, S. G. (1981). Fenitized Sandstones in Amba Dongar Carbonatites, Gujarat, India. Journal of Geological Society of India, 22(8), 368–374. Retrieved from http://www.geosocindia.com/index.php/jgsi/article/view/64880

References

DEANS, T., SUKEHSWALA, R. N., SETHNA, S.F. and VILADKAR, S. G., (1972) Metasomatic feld spar rocks (potash fenites) associated with the fluorite deposits and carbonatites of Amba Dongar, Gujarat, India. Trans. Inst. Min. Met., v. 81, pp. B1-B9.

DEANS, T., (1973) Discussions and Contributions. Trans. Inst. Min. Met. v. 82

SHAPIRO, L. and BRANNOCK, W. W., (1962) Rapid analyses of silicate rocks. Bull. Geol. Surv. Amer., v. 1144-A, pp. 1-56.

VARTIAINEN, H. and WOOLLEY, A. R., (1976) The petrography, mineralogy and chemistry of the fenites of Sokli carbonatite intrusion, Finland. Bull. Geol. Surv. Fin., v. 20.

WOOLLEY, A. R., (1969) Some aspects of fenitization with particular reference to Chilwa Island and Kangankunde, Malawi. Bull. Br. Mus. (Nat. Hist.) Minerai, v. 2, No.4.

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