Transmission electron microscopic study of coexisting pyrophyllite and muscovite: direct evidence for the metastability of illite

Jiang Wei-Teh Jiang, E. J. Essene, D. R. Peacor

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Transmission electron microscopy has been used to characterize coexisting pyrophyllite and muscovite in low-grade metamorphosed pelites from Witwatersrand and northeastern Pennsylvania. The Witwatersrand sample consisted largely of porphyroblasts of interlayered muscovite and pyrophyllite in a fine-grained matrix of the same phases. The textures of both samples were consistent with an equilibrium relationship between pyrophyllite and muscovite. The Pennsylvania sample also contained NH4-rich illite, kaolinite, and an illite-like phase having intermediate Na/K, which collectively imply non-equlibrated low-grade conditions. -from Authors

Original languageEnglish
Pages (from-to)225-240
Number of pages16
JournalClays & Clay Minerals
Volume38
Issue number3
Publication statusPublished - 1990 Jan 1

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

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