Transmission electron microscopic study of coexisting pyrophyllite and muscovite

direct evidence for the metastability of illite

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

Research output: Contribution to journalArticle

44 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

Fingerprint

muscovite
pyrophyllite
illite
electrons
electron
Electrons
Kaolin
porphyroblast
kaolinite
sampling
transmission electron microscopy
Textures
texture
Transmission electron microscopy
matrix
aluminosilicate

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Transmission electron microscopic study of coexisting pyrophyllite and muscovite: direct evidence for the metastability of illite",
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",
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Transmission electron microscopic study of coexisting pyrophyllite and muscovite : direct evidence for the metastability of illite. / Jiang, Wei-Teh; Essene, E. J.; Peacor, D. R.

In: Clays & Clay Minerals, Vol. 38, No. 3, 01.01.1990, p. 225-240.

Research output: Contribution to journalArticle

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AB - 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

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