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Observations on the Nepheline Syenites of Koraput, Orissa

Published online by Cambridge University Press:  01 May 2009

M. K. Bose
M. K. Bose
Affiliation:
Department of Geology, Presidency College, Calcutta.
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Abstract

The nepheline syenites of Koraput, Orissa, in eastern India, are described for the first time with mineralogical details. The major rock type is a hypersolvus nepheline syenite. The mafic minerals are iron-rich biotite and subordinate alkali ferrohastingsite, the latter coexisting with titanomagnetite. The crystallization history of the magma has been interpreted in the light of chemical data on the rock and coexisting nepheline and alkali feldspar.

Type
Articles
Information
Geological Magazine , Volume 101 , Issue 6 , 30 December 1964 , pp. 558 - 563
Copyright
Copyright © Cambridge University Press 1964

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References

REFERENCES

Bose, M. K., 1964. Amphiboles in alkaline rocks of Koraput, Orissa. Miner. Mag., 33, 912–917.Google Scholar
Hamilton, D. L., 1961. Nepheline as the crystallisation temperature indicators. J. Geol., 69, 321–329.CrossRefGoogle Scholar
Hamilton, D. L., and MacKenzie, W. S., 1960. Nepheline solid solutions in the system NaA1SiO4-KA1SiO4-SiO2. J. Petrology, 1, 65–72.CrossRefGoogle Scholar
Johannsen, A., 1938. Descriptive Petrography of Igneous Rocks. Vol. 4. Chicago.Google Scholar
MacKenzie, W. S., 1954. The orthoclase microcline inversion. Miner. Mag., 30, 354–366.Google Scholar
Nockolds, S. R., 1947. Relation between chemical composition and paragenesis in the biotite micas of igneous rocks. Amer. J. Sci., 245, 401–420.CrossRefGoogle Scholar
Tilley, C. E., 1954. Nepheline alkali feldspar parageneses. Amer. J. Sci., 252, 65–75.CrossRefGoogle Scholar
Tilley, C. E., 1958. Problems of alkali rock genesis. Quart. J. geol. Soc. Lond., 113, 323–330.CrossRefGoogle Scholar
Tilley, C. E., 1961. Nepheline syenites of Port Herald, Nyasaland. Overseas geol. Miner. Res. Bull., 8, 255–259.Google Scholar
Tuttle, O. F., 1952. Origin of contrasting mineralogy of extrusive and plutonic salic rocks. J. Geol., 60, 107–124.CrossRefGoogle Scholar
Tuttle, O. F., and Smith, J. V., 1959. The nepheline-kalsilite system. II. Phase relations. Amer. J. Sci., 256, 571–589.CrossRefGoogle Scholar
Walker, T. L., 1908. Nepheline syenites from the hill tracts of Vizagapatam, Madras. Rec. geol. Surv. India., 36, 19–22.Google Scholar