Prograde versus retrograde chlorite-amphibole intergrowths in a calc- silicate rock

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Abstract

Transmission electron microscopy was used to determine structural relationships between chlorite and amphibole and to distinguish prograde from retrograde intergrowths. Prograde chlorite inclusions occur with hk0 zone axes subparallel to the amphibole c axis but have incoherent and fractured boundaries. These relations are consistent with mimetic growth of amphibole in the chlorite foliation but not with topotaxial replacement. Some retrograde chlorite in amphibole occurs with chlorite (001) and amphibole (100) planes parallel and the amphibole c axis parallel to cholorite [100], [1̄10], or [1̄1̄0]. Coherent boundaries occur parallel to chlorite (001) layers, with no apparent misfit strain. Growth ledges of talc-like layers occur along coherent boundaries, showing that chlorite growth can occur by a single-layer mechanism. Boundaries that are not parallel to chlorite layers are strained such that chlorite layers bend to promote coherence. Most retrograde intergrowths are associated with fractures and consist of chlorite with minor amounts of talc and unidentified phyllosilicates. -from Authors

Original languageEnglish (US)
Pages (from-to)1292-1301
Number of pages10
JournalAmerican Mineralogist
Volume73
Issue number11-12
StatePublished - 1988

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Amphibole Asbestos
calc silicate rock
Silicates
amphiboles
amphibole
chlorite
silicates
Rocks
rocks
talc
Talc
ledges
inclusions
phyllosilicate
transmission electron microscopy
foliation
replacement

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Prograde versus retrograde chlorite-amphibole intergrowths in a calc- silicate rock. / Sharp, Thomas; Buseck, P R.

In: American Mineralogist, Vol. 73, No. 11-12, 1988, p. 1292-1301.

Research output: Contribution to journalArticle

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