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Compositional range of P2/n omphacite from the eclogitic rocks of central Shikoku, Japan

Published online by Cambridge University Press:  05 July 2018

Kazumi Yokoyama ,
Shohei Banno  and
Takeo Matsumoto
Kazumi Yokoyama
Affiliation:
Geological Institute, University of Tokyo, Hongo, Tokyo 113, Japan
Shohei Banno
Affiliation:
Geological Institute, University of Tokyo, Hongo, Tokyo 113, Japan
Takeo Matsumoto
Affiliation:
Department of Earth Sciences, Kanazawa University, Kanazawa 920, Japan
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Summary

The lattice types of omphacite-diopside series clinopyroxenes were determined for 9 Japanese, 2 Norwegian, and 1 South African samples. The boundary between the compositional ranges of P and C lattice clinopyroxenes lies at about 14·5 wt. % CaO in Japanese and Norwegian samples, and the compositional gap between them is very small, if it exists. The South African omphacite has C-lattice in the compositional range of P lattice omphacite in metamorphic eclogites. These data combined with the reported electron microscope studies suggest that the omphacite—diopside series clinopyroxene has a C lattice structure above 3 to 400°C and very slow cooling after regional metamorphism is responsible for the transition to the ordered structure with P lattice symmetry.

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 315 , September 1976 , pp. 773 - 779
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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References

Albee, (A. L.) and Ray, (L.), 1970. Anal. Chem. 42, 1408.Google Scholar
Banno, (S.), 1970. Phys. Earth Planet. Interiors, 3, 405.CrossRefGoogle Scholar
Banno, (S.), Yokoyama, (K.), Iwata, (O.), and Terashima, (S.), 1976. Jour. Geol. Soc. Japan, 82, 199.CrossRefGoogle Scholar
Bryhni, (I.), Bollingbero, (H. J.), and Graf, (P. R.), 1969. Norsk GeoL Tidskr. 49, 193.Google Scholar
Black, (P. M.), 1969. Amer. Min. 55, 512.Google Scholar
Champness, (P. E.), 1973. Ibid. 58, 540.Google Scholar
Clark, (J. R.), and Papike, (J. J.), 1966. Science 54, 479.Google Scholar
Clark, (J. R.), 1968. Amer. Min. 53, 840.Google Scholar
Clark, (J. R.), Appleman, (D. E.) and Papike, (J. J.), 1969. Spec. Pap. Min. Soc. Amer. 2, 31.Google Scholar
Kanazawa, (Y.) and Matsumoto, (T.), 1972. Journ. Min. Soc. Japan, 10, 362.Google Scholar
Kusnlro, (I.) and Aoki, (K.), 1968. Amer. Min. 53, 1347.Google Scholar
Matsuivtoto, (T.) and Banno, (S.), 1970. Proc. Japan Academy, 46, 173.CrossRefGoogle Scholar
Matsuivtoto, (T.) Tokonami, (M.) and Morimoto, (N.), Amer. Min. 60, 634.Google Scholar
Mori, (T.) and Baxqno, (S.), 1973. Contr. Min. Petrol. 41, 301.CrossRefGoogle Scholar
Phakey, (P. P.) and Ghose, (S.), 1973. Ibid. 39, 239.CrossRefGoogle Scholar
Råheim, (A.) and Green, (D. H.), 1974. Ibid. 48, 179.Google Scholar
Yokoyama, (K.), 1974. M.Sc. Thesis Kanazawa University.Google Scholar
Yokoyama, (K.), 1975. Journ. Geol. Soc. Japan 81, 431.Google Scholar
Yokoyama, (K.), and Mori, (T.), 1975. Ibid. 81, 29.CrossRefGoogle Scholar

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