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Some unusual alkali-felspars in the Central Australian charnockitic rocks

Published online by Cambridge University Press:  14 March 2018

Allan F. Wilson
Allan F. Wilson*
Affiliation:
University of Western Australia; formally of Department of Geology, University of Adelaide, South Australia
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Extract

During a universal stage investigation of the pegmatitic felspars in the Central Australian charnockites, several alkali-felspars were found which, according to the stereograrms published by Emmons (3, pl. 12), should have been near ' anorthoclase' in composition. This identification, based purely on optical properties, was questioned in the first instance because of the absence of other evidence for a soda-rich suite of minerals in these apparently potassic pegmatites. Two felspars which suggested a high soda-content were chemically analysed. Neither proved to be notably high in soda.

Information

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 210 , September 1950 , pp. 215 - 224
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1950

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References

1. Allig, (H.L.), 1921. The mineralography of the feldspars. PartI. Journ.Geol. Chicago, vol. 29, pp. 103-204. [M.A. 3-33.]Google Scholar
2. Allig, (H.L.) 1923. The mineralography of the feldspars, part II. Ibid., vol. 31, pp. 282-305 and 353-375. [M.A. 3-33.]Google Scholar
3. E.VIMONS, (R.C.), 1943. The universal stage. Mem. Geol. Soc. America, no. 8. [M.A. 9-18.]Google Scholar
4. Jayaraman, (N.), 1940. A chemical and mineralogical study of the feldspars from the mica-pegmatites of Nellore, Madras. Proc. Indian Acad. Sci., Sect. A, vol. 11, pp. 117-137. [M.A. 3-16.]Google Scholar
5. Spencer, (E.), 1930. A contribution to the study of moonstone from Ceylon. Min. Mag., vol. 22, pp. 291-367.Google Scholar
6. Spencer, (E.), 1937. The potash-soda-felspars. I, Thermal stability. Ibid., vol. 24, pp. 453-494.Google Scholar
7. Spencer, (E.), 1938. The potash-soda-felspars? -II, Some applications to petrogenesis. 1bid., vol. 25, pp. 87-I18.Google Scholar
8. Spencer, (E.) 1945. Myrmekite in graphic granite and in vein perthite. Ibid., vol. 27, pp. 79-98.Google Scholar
9. Vogt, (J. H. L.), 1926. The physical chemistry of magmatic differentiation of igneous rocks?-If. Skrift. Norske Vidensk.-Akad., Mat.-naturv. KI., no. 4, pp. 1-201. [M.A. 3-379.]Google Scholar
10. Wxlson, (A.F.), 1947. The charnockitic and associated rocks of north.western South Australia. Part I. The Musgrave Ranges. An introductory account. Trans. Roy. Soc. S. Australia, vol. 71, pp. 195-211. [M.A. i0-438.]Google Scholar
11. Wxlson, (A.F.), 1950. Fluorescent felspar and zircon as petrological aids. Min. Mag., vol. 29, p. 225.Google Scholar