Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-23T16:42:49.931Z Has data issue: false hasContentIssue false
  • English
  • Français

Fe-Li micas: a new approach to the substitution series

Published online by Cambridge University Press:  05 July 2018

Sun Shihua  and
Yu Jie
Sun Shihua
Affiliation:
Research Center for Mineral Resources Exploration, Chinese Academy of Sciences, P.O. Box 9701, A-11 Datun Rd, Beijing 100101, China
Yu Jie
Affiliation:
Research Center for Mineral Resources Exploration, Chinese Academy of Sciences, P.O. Box 9701, A-11 Datun Rd, Beijing 100101, China
Get access Rights & Permissions [Opens in a new window]

Abstract

Over the last 50 years many definitions of element substitution series have been proposed for describing natural Fe-Li micas with complex chemical compositions. In order to compare these definitions and ascertain their reliability, a new geometric frame composed of ideal mica points, mica joins (segments), substitution vectors and substitution planes is constructed to express the entire substitution system of ideal Fe-Al-Li micas. The frame is built in composition space with the coordinate system (0; Si, AlVI AlIV, Fe2+, Li, □VI, K), but has a 3-dimensional analogue, i.e. a visual image.

Using this frame, it has been proved that there are only five possible types of replacement for definitions of Fe-Li micas, and that all possible types have been suggested except the AlIV-constant. Furthermore, it has been proved that the main point in different definitions is that the replacement of Li by Fe2+ needs to be balanced with AlIV, AlVI, or □VI. In order to solve this problem, a set of formulae determining spatial relations between geometric elements in the frame is suggested. With these formulae, the abstract frame is suggested to be a datum system used to ascertain quantitatively the reliability of definition of natural Fe-Li micas.

Keywords

Fe-Li micassubstitution seriessubstitution vectorsubstitution plane
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 6 , December 1999 , pp. 933 - 945
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Betehtin, A.G. (1950) Mineralogy. M. Gecgeolizdat, 965 p (in Russian).Google Scholar
Černý, P. and Burt, D.M. (1984) Paragenesis crystallochemical characteristics and geochemical evolution of micas in granite pegmatites. In Micas (Bailey, S.W., ed.). Reviews in Mineralogy, 13. Mineralogical Society of America, Washington D.C., pp. 257–98.CrossRefGoogle Scholar
Chaudhry, M.N. and Howie, R.A. (1973) Lithium- aluminium micas from the Meldon aplite, Devonshire, England. Mineral. Mag., 39, 289–96.CrossRefGoogle Scholar
Foster, M.D. (1960 a) Interpretation of the composition of lithium micas. U.S. Geol. Surv. Prof. Paper, 354-E, 115–47.Google Scholar
Foster, M.D. (1960 b) Interpretation of the composition of trioctahedral micas. U.S. Geol. Surv. Prof. Paper, 354–B, 11–48.Google Scholar
Ginzburg, A.I. and Berkhin, S.I. (1953) On the composition and chemical constitution of the lithium micas. Mineralog. Muzeya. Akad. Nauk USSR Trudy, 5, 90–133 (in Russian).Google Scholar
Henderson, C.M.B., Martin, J.S. and Mason, R.A. (1989) Compositional relations in Li-micas from SW England and France: an ion- and electron- microprobe study. Mineral. Mag., 53, 427–49.CrossRefGoogle Scholar
Lapides, I.L., Kovalenko, V.I. and Koval, P.V. (1977) The Micas of Rare-Metal Granitoids. Nauka Sibirskoje Otd., Novosibirsk, Russia. 104 pp, (in Russian).Google Scholar
Muñoz, J.L. (1968) Physical properties of synthetic lepidolite. Amer. Mineral., 53, 1490–521.Google Scholar
Rieder, M. (1968) Zinnwaldite: octahedral ordering in Fe-Li micas. Science, 160, 1338–40.CrossRefGoogle Scholar
Rieder, M. (1970) Chemical composition and physical properties of lithium-iron micas from the Krusne hory Mts. (Erzgebirge), Part A: Chemical composition. Contr. Mineral. Petrol., 27, 131–58.CrossRefGoogle Scholar
Rieder, M. and fourteen members of the IMA CNMMN Mica Subcommittee (1999) Nomenclature of the micas. Mineral. Mag., 63, 267–79.CrossRefGoogle Scholar
Stone, M., Exley, C.S. and George, M.C. (1988) Compositions of trioctahedral micas in the Cornubian batholith. Mineral. Mag., 52, 175–92.CrossRefGoogle Scholar
Stone, M., Klominsky, J. and Rajpoot, G.S. (1997) Composition of trioctahedral micas in the Karlovy Vary pluton, Czech Republic and a comparison with those in the Cornubian batholith, SW England. Mineral. Mag., 61, 791–807.CrossRefGoogle Scholar
Shihua, Sun (1982) The substitution of lithium micas andtheir significance in the study of granitoids. In Geology of granites and their metallogenetic relations: Proceedings of the International Symposium. (Keqing, Xu and Guangchi, Tu, eds.). Nanjing University, China, pp 379–94.Google Scholar
Shihua, Sun (1988) Interpretation of chemical composition and subdivision of iron-lithium micas. Scintia Geol. Sinica, 3, 213–28 (in Chinese).Google Scholar
Shihua, Sun and Jie, Yu (1984) Fe-Al micas and aluminiun siderophyllite. Acta Mineralog. Sinica, 3, 226–35 (in Chinese).Google Scholar
Shihua, Sun and Jie, Yu (1989 a) Interpretation of chemical composition and subdivision of magnesium-iron micas, part B: The natural subdivision of Mg-Fe micas, Scientia Geol. Sinica, 2, 176–89 (in Chinese).Google Scholar
Shihua, Sun and Jie, Yu (1989 b) Natural subdivision of micas: A new approach to granitoid petrogenesis. Int. Geol. Congress, Washington, D.C. 1989, pp. 283–98.Google Scholar
Shihua, Sun and Jie, Yu (in prep.) Actual Fe-Li mica series as a series with □VI constant, but not with AlIV or AlVI.Google Scholar
Winchell, A.N. (1927) Further studies in the mica group. Amer. Mineral., 12, 267–79.Google Scholar
Winchell, A.N. (1942) Further studies in the lepidolite system. Amer. Mineral., 27, 114–30.Google Scholar