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Transmission electron microscopy of pyrometamorphic breakdown of phengite and chlorite

Published online by Cambridge University Press:  05 July 2018

R. H. Worden ,
P. E. Champness  and
G. T. R. Droop
R. H. Worden
Affiliation:
Department of Geology, University of Manchester, Oxford Road, Manchester, M13 9PL
P. E. Champness
Affiliation:
Department of Geology, University of Manchester, Oxford Road, Manchester, M13 9PL
G. T. R. Droop
Affiliation:
Department of Geology, University of Manchester, Oxford Road, Manchester, M13 9PL
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Abstract

Phengite and chlorite have undergone decomposition during pyrometamorphism caused by the intrusion of a dolerite feeder pipe into Dalradian greenschists in Argyllshire, Scotland. All reaction products are extremely fine grained. Transmission electron microscopy has revealed that phengite pseudomorphs consist of biotite, spinel, mullite, sanidine and phengite, and that chlorite pseudomorphs consist of combinations of chlorite, spinel, orthopyroxene, magnetite, cordierite and biotite. Although the reactions were short-lived and did not go to completion, microprobe analysis and phase diagram analysis have revealed that there has been significant chemical interaction between the phyllosilicates and the surrounding rock. Numerous orientation relationships exist between the original minerals and their reaction products; the close-packed planes in the precursor phyllosilicates were inherited by their reaction products.

Keywords

reaction mechanismelectron microscopypyrometamorphismphengitechlorite
Type
Electron Microscopy in Mineralogy and Petrology
Information
Mineralogical Magazine , Volume 51 , Issue 359 , March 1987 , pp. 107 - 121
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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