White mica domain formation: A model for paragonite, margarite, and muscovite formation during prograde metamorphism

Kenneth J T Livi, George E. Christidis, P. Árkai, David R. Veblen

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Scanning transmission electron microscopy images of the 00/ white mica planes in crystals from central Switzerland and Crete, Greece reveal that domains of paragonite, margarite, and muscovite are ordered within the basal plane. Energy dispersive X-ray analyses show that both cations in the interlayer and in the 2:1 layer have ordered on the scale of tens to hundreds of nanometers. Domain boundaries can be both sharp and crystallographically controlled or diffuse and irregular. A model outlining the domain formation process is presented that is consistent with X-ray powder diffraction and transmission electron microscopy data. The domain model incorporates aspects of a mixed-layered and a disordered compositionally intermediate phase models. The main feature of the model is the formation of mica species that segregate within the basal plane and contradict the notion of homogeneous layers within mixed-layer phases. Implications the formation of all diagenetic and very low-grade metamorphic 2:1 sheet silicates are discussed.

Original languageEnglish
Pages (from-to)520-527
Number of pages8
JournalAmerican Mineralogist
Volume93
Issue number4
DOIs
Publication statusPublished - Apr 2008

Fingerprint

paragonite
prograde metamorphism
muscovite
mica
transmission electron microscopy
Transmission electron microscopy
Silicates
Greece
phyllosilicate
Switzerland
X ray powder diffraction
mixed layer
Cations
interlayers
grade
silicates
x rays
cation
scanning electron microscopy
X-ray diffraction

Keywords

  • Low-grade metamorphism
  • Margarite
  • Muscovite
  • Paragonite
  • STEM
  • TEM
  • White mica formation

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

White mica domain formation : A model for paragonite, margarite, and muscovite formation during prograde metamorphism. / Livi, Kenneth J T; Christidis, George E.; Árkai, P.; Veblen, David R.

In: American Mineralogist, Vol. 93, No. 4, 04.2008, p. 520-527.

Research output: Contribution to journalArticle

Livi, Kenneth J T ; Christidis, George E. ; Árkai, P. ; Veblen, David R. / White mica domain formation : A model for paragonite, margarite, and muscovite formation during prograde metamorphism. In: American Mineralogist. 2008 ; Vol. 93, No. 4. pp. 520-527.
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