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Pyroxenes from the early and middle stages of fractionation of the Skaergaard intrusion, East Greenland

Published online by Cambridge University Press:  14 March 2018

G. M. Brown ,
E. A. Vincent  and
P. E. Brown
G. M. Brown
Affiliation:
Department of Geology and Mineralogy, University Museum, Oxford
E. A. Vincent
Affiliation:
Department of Geology and Mineralogy, University Museum, Oxford
P. E. Brown
Affiliation:
Department of Geology, University of Manchester
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Summary

Coexisting calcium-rich and calcium-poor pyroxenes have been separated from the gabbros and ferrogabbros of the Skaergaard layered basic intrusion and chemically analysed. Nine new analyses of augites, three of inverted pigeonites, and one of orthopyroxene are presented, together with optical properties. The trend of crystallization of the augites is different from that drawn by previous investigators. The stages at which the orthopyroxene and pigeonite begin and cease to erystallize are defined, and the sub-solidus exsolution and inversion textures of the pigeonites are examined in detail. The characters of the exsolution textures and the degree of pigeonite inversion (monoclinic to orthorhombic pyroxene) are shown to change gradually with height in the intrusion, and are related to a gradual change in the interval between the temperatures of crystallization and inversion.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 238 , September 1957 , pp. 511 - 543
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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References

Atlas, (L.), 1952. Journ. Geol., Chicago, vol. 60, p. 125 [M.A. 12-80].Google Scholar
Barh, (T. F. W.), 1952. Theoretical Petrology. 1st edn., p. 110. John Wiley and Sons, New York.Google Scholar
Bowen, (N. L.), 1914. Amer. Journ. Sci., ser. 4, vol. 38, p. 207.Google Scholar
Bowen, (N. L.), and Schairer, (J. F.), 1935. Ibid., ser. 5, vol. 29, p. 151 [M.A. 6-352].Google Scholar
Bowen, (N. L.), Schairer, (J. F.), and Posnjak, (E.), 1933. Ibid., vol. 26, p. 193 [M.A. 5-454].Google Scholar
Brown, (G. M.), 1956. Phil. Trans. Roy. See., ser. B, vol. 240, p. 1.Google Scholar
Brown, (P. E.), 1955. Ferromagnesian Minerals of the Skaergaard Intrusion, East Greenland. Ph.D. thesis (unpublished), University of Manchester.Google Scholar
Hess, (H. H.), 1941. Amer. Min., vol. 26, pp. 515, 573 [M.A. 8-233].Google Scholar
Hess, (H. H.), 1949. Ibid., vol. 34, p. 621 [M.A. 11-15].Google Scholar
Hess, (H. H.), 1952. Amer. Journ. Sci., Bowen vol., p. 173 [M.A. 12-97].Google Scholar
Hess, (H. H.), and Phillips, (A. H.), 1938. Amer. Min., vol. 23, p. 450 [M.A. 7-180].Google Scholar
Hori, (F.), 1954. Sci. Papers College Gen. Education, Univ. Tokyo, vol. 4, no. 1, p. 71.Google Scholar
Kuno, (H.), 1955. Amer. Min., vol. 40, p. 70.Google Scholar
Kuno, (H.), and Hess, (H. H.), 1953. Amer. Journ. Sci., vol. 251, p. 741 [M.A. 12-334].Google Scholar
Kuno, (H.), and Nagashima, (K.), 1952. Amer. Min., vol. 37, p. 1000 [M.A. 12-138].Google Scholar
Muir, (I. D.), 1951. Min. Mag., vol. 29, p. 690.Google Scholar
Muir, (I. D.), 1954. Ibid., vol. 30, p. 376.Google Scholar
Muir, (I. D.), 1955. Ibid., vol. 30, p. 545.Google Scholar
Poldervaart, (A.) and Hess, (H. H.), 1951. Journ. Geol., Chicago, vol. 59, p. 472 [M.A. 11-290].Google Scholar
Segnit, (E. R.), 1953. Min. Mag., vol. 30, p. 218.Google Scholar
Tsuboi, (S.), 1932. Japan. Journ. Geol. Geogr., vol. 10, p. 67 [M.A. 5-219].Google Scholar
Tsuboi, (S.), 1949. Proc. Japan. Acad., vol. 25, no. 1, p. 34.Google Scholar
Wager, (L. R.) and Deer, (W. A.), 1939. Medd. Grønland, vol. 105, no. 4, p. 1 [M.A. 11-32].Google Scholar
Wilkinson, (J. F. G.), 1956. Amer. Min., vol. 41, p. 724.Google Scholar
Yoder, (H. S.) and Tilley, (C. E.), 1956. Program 1956 Annual Meetings, Geol. See. Amer., p. 100.Google Scholar