Mineralogy and Petrochemistry of the Differentiated Sill Around Gwalior City, Madhya Pradesh

Authors

  • S. Varadarajan
     Department of Geology, University of Delhi, Delhi
  • V. K. Verma
     Department of Geology, University of Delhi, Delhi

Abstract

Mineralogical and petrochemical characteristics of the differentiated sill, occurring at the highest horizon of Morar Stage, Gwalior System (Cuddapah age), around the city of Gwalior, Madhya Pradesh, are detailed. Petrographically the sill, composed of dolerite which is sparsly porphyritic, tends to be quartz dolerite in higher levels. The occurrence of micropegmatitic texture is proportional to the amount of hornblende present in the rock. Chemical nature of the chilled margin reveals that the undifferentiated magma was tholeiitic. Differentiation in the sill is of limited extent and is considered to be the result of the combined processes of fractional crystallisation, crystal settling and mild convectional currents.

Downloads

Download data is not yet available.

Issue

Volume 14, Issue 4, December 1973

Section

Articles

Downloads

Published

1973-12-01

How to Cite

Varadarajan, S., & Verma, V. K. (1973). Mineralogy and Petrochemistry of the Differentiated Sill Around Gwalior City, Madhya Pradesh. Journal of Geological Society of India, 14(4), 384–393. Retrieved from https://geosocindia.com/index.php/jgsi/article/view/61859

References

BAJAPAJ, M. P., (1935) The Gwalior Trap from Gwalior, India; Geological Magzille. v, 7,2. pp.114-126.

CHAYES, F., (1952) Relation between composition and indices of refraction in natural plagioclase; Am. Jour. Sci., Bowen volume. pp. 85-106.

CRAWFORD, A. R. and COMPSTON, W., (1970) The age of Vindhyan System, Peninsular India; Geol, Soc., London, Quart. Jour.; v, 125, pp. 351-372.

DEER, W. A., HOWIE, R. A. and ZUSSMAN, J., (1962) Rock Forming Minerals; v. 2, Longmans, DUBEY, V. S., (1930) Helium Ratio of Basic Rocks from Gwalior, Central India; Nature, v . 126.

FENNER. C. N., (1929) The crystallisation of Basalts; Am. Jour. Sci., V. Series, v. 18, pp, 225-253.

HACKET, C. A., (1871) Geology of Gwalior and vicinity ; Rec. Geol. Surv, India, v. 3, pp, 33-42.

HESS, H. H., (1949) Chemical composition and optical properties of common clinopyroxenes ; Part I, Amer. Min.; v. 34, p. 621.

HESS, H. H., (1956) The magnetic properties and differentiation of Dolerite sills-e-Discussion ; Am. Jour. Sci., v. 254, PP, 446-451.

KENNEDY, W. Q., (1933) Trends of Differentiation in Basaltic Magma; Am. Jour. Sci., V. Series, v, 25, pp, 239-256.

KUNO, H., (1970) Differentiation of Basaltic Magma-in Basalts. The Treatise 011 Rocks of Basaltic Composition. Editor-Hess. H H Poldervaart, A., pp. 623-685.

McDOUGALL, I., (1962) Differentiation of Tasmanian dolerites, Red Hill dolerite-grancphyre association;" Geol. Soc. America Bull. v, 73. pp. 279-316.

MUIR, I. D., (1951) The clinopyroxenes of Skeargard intrusion, Eastern Greenland; Mill. Mag., v. 25, pp, 690-714.

NOCKOLDS, S. R., (1954) Average chemical composition of some igneous rocks; Geol. Soc. America, Bull., v. 65, pp. 1007-1032.

PASCOE, E. H., (1965,) A Manual of Geology of India and Burma. Govt. of India Publication.

POLDERVAART, A., (1950) Correlation of the physical properties and chemical composition in plagioclase, olivine and orthopyroxene series; Am. Mineral v. 35, pp. 1067-1079.

POLDERVAART, A., (1964) Chemical definition of alkali basalt and tholeiite; Geol. Soc. America Bull., v. 75, pp. 299-232.

POLDERVAART, A., and HESS, H. H., (1951) Pyroxenes in the 0rystallisation of basaltic magma; Jour, Geol., v. 59, p. 472.

SIMPSON, E. S. W., (1954) On the graphical representation of differentiation trends in igneous rocks; Geol. Mag., v, 91, pp. 238-244.

SLEMMONS, (1962) Determination of twin laws and composition of plagioclase; Geol. Soc. America, special paper 69, pp. 1-42.

TILLEY, C. E., (1950) Some aspects of magmatic evolution; Geol. Soc. London Quart. Jour., v.106, pp. 37-61.

VARADARAJAN, S. and VERMA, V. K., (1971) On the nature of contact between the Gwalior sill and Kaimur Sandstone around Gwalior, Madhya Pradesh; Cur, Sci., v, 40, pp. 404-406.

WAGER, L. R. and DEER, W. A., (1939) The petrology of Skeargard intrusion, Kangerdlugssaaq, Eastern Greenland ; Meddel. Om. Gronland Bd, v. 105, p. 333.

WALKER, K. R., (1970) A mineralogical, petrological and geochemical investigation of Palisade Sill. New Jersy: Igneous and Metamorphic Rocks-Editor. L. Larsen; Geol. Soc. America Memoir, v, 115, pp.175-187.

WALKER, F. and POLDERVAART. A., (1949) Karroo dolerites of the Union of South Africa; Geol. Soc. America Bull., v, 60. pp. 591-706.

YODER, H. S. JR. and TILLEY, C. E., (1962) Origin of Basaltic Magmas; an experimental study of natural and synthetic rock systems; Jour. petrology, v. 3, PP. 342-532.

Most read articles by the same author(s)