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The Modulated Structure of the Intermediate Plagioclases and Its Change with Composition

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Feldspars and Feldspathoids

Part of the book series: NATO ASI Series ((ASIC,volume 137))

Abstract

Since the discovery of satellite reflections in the intermediate plagioclase feldspars of composition An~25 – An~75, the so-called e-plagioclases, many models have been presented for these modulated structures. Recent X-ray diffraction studies of the modulated structure have indicated coexistence of density and shift modulations of atoms in the structure. The fundamental difference between the models is in the treatment of the second harmonic of the density modulation of the (Na, Ca) atoms. The model in which the second harmonic is considered negligible gives alternating arrangement of Na and Ca in consecutive subcells. On the other hand, the model in which the second harmonic is considered important, gives alternating anorthite-like and albitelike bands running perpendicular to the t vector. Although it is not easy to decide which model is correct only from the intensities of the satellite reflections, crystal-chemical considerations of the resultant structures and electron microscopy of the antiphase domain boundaries (APBs) support the second model. In the second model, the modulated structure of the e-plagioclases consists of albite-like and anorthite-like bands, both of which change their orientation and width with composition.

Three interpretations on the state of the e-plagioclases have been published : (1) an incipient stage of the decomposition to the stable assemblage, (2) a resonance structure, (3) an II structure stabilized by a periodic arrangement of APBs. The second X-ray structural model supports a resonance structure between Ca-rich I-anorthite and Na-rich I-albite. The orientation of the modulation wave in the modulated structure in the e-plagioclases may perhaps be explained by elastic energy.

In both calculations of the orientation, the special character of the regular arrangement of the e-APBs and the stabiblization energy have not been taken into consideration. Therefor, more exact treatments are necessary to explain the change of the orientation and width of the albite-like bands with composition change.

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Authors and Affiliations

  1. Department of Geology and Mineralogy, Faculty of Science, Kyoto University, Sakyo, Kyoto 606, Japan

    Masao Kitamura & Nobuo Morimoto

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  1. Masao Kitamura
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  2. Nobuo Morimoto
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  1. Laboratory of Petrology, University of Nancy I, Nancy, France

    William L. Brown

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Kitamura, M., Morimoto, N. (1984). The Modulated Structure of the Intermediate Plagioclases and Its Change with Composition. In: Brown, W.L. (eds) Feldspars and Feldspathoids. NATO ASI Series, vol 137. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-6929-3_3

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  • DOI: https://doi.org/10.1007/978-94-015-6929-3_3

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