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Subsolidus Phase Relations of the Plagioclase Feldspar Solid Solution

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Part of the NATO ASI Series book series (ASIC,volume 421)

Abstract

Experimental, microstructural and calorimetric evidence for the stability relations among plagioclase feldspars is reviewed, and a new phase diagram proposed. The incommensurate “e” structure is now believed to have a field of equilibrium stability at intermediate compositions in the solid solution. Two phase fields are interpreted as arising from breaks in the ordering behaviour as a function of composition. The Huttenlocher gap may extend up to ~800°C and is presumed to occur between the stability fields of e1 and \(I\bar 1\) ordering. A spinodal mechanism for exsolution can be explained if the \(I\bar 1 \rightleftharpoons {\text{e}}_{\text{1}} \) ⇌ e1 transition is taken to be thermodynamically continuous. The Bøggild gap may also extend up to ~800°C as a consequence either of a break between \(C\bar 1\) and e1 structures or of a break between e1 and e2 structures at ~An50. Again, a thermodynamically continuous \(C\bar 1 \rightleftharpoons {\text{e}}_{\text{1}} \) ⇌ e1 transition would allow a spinodal exsolution mechanism. As in previous reviews, the peristerite gap is ascribed to the influence of an increase in the equilibrium degree of Al/Si order in pure albite below ~650–700°C. Incommensurate ordering is now known to occur also in anorthite under metastable conditions and this has implications for the nature of the e structure in crystals with intermediate compositions. Finally, schematic free energy curves and selected Landau free energy expansions are shown to provide a basis for future thermodynamic models of the overall mixing and ordering behaviour.

Keywords

  • Contrib Mineral Petrol
  • Plagioclase Crystal
  • Plagioclase Feldspar
  • Incommensurate Structure
  • Exsolution Texture

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Carpenter, M.A. (1994). Subsolidus Phase Relations of the Plagioclase Feldspar Solid Solution. In: Parsons, I. (eds) Feldspars and their Reactions. NATO ASI Series, vol 421. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1106-5_6

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  • DOI: https://doi.org/10.1007/978-94-011-1106-5_6

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