Abstract
The authors have recognized strong lineation in the nepheline syenites of Khammam District, Andhra Pradesh. On account of the parallel disposition of the elongated clusters of dark and light mineral constituents in alternate bands, the nepheline syenites have been rendered gneissose. The term “unfoliated gneiss” is coined to describe such gneissic rocks with lineation alone and without planar arrangement (foliation) of the constituent mineral grains. A new method, following crystallographic terminology, of describing lineation in gneisses, which do not possess foliation, has been offered.
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References
Cloos, E... “Lineation, a critical review and annotated bibliography,”Geol. Soc. Amer. Memoir 18, 1946, p. 15.
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Communicated by Prof. L. Rama Rao,f.a.sc.
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Suryanarayana, K.V., Subbarao, K.V. On lineation. Proc. Indian Acad. Sci. 64, 143–145 (1966). https://doi.org/10.1007/BF03052127
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DOI: https://doi.org/10.1007/BF03052127