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Porphyroblast textural sector-zoning and matrix displacement

Published online by Cambridge University Press:  05 July 2018

A. H. N. Rice  and
J. I. Mitchell
A. H. N. Rice
Affiliation:
Geologisch-Paläontologisches Institut, Ruprecht-Karls Universität, Im Neuenheimer Feld 234, D-6900 Heidelberg, Germany
J. I. Mitchell
Affiliation:
9 St Peters Street, Roath, Cardiff CF2 3BA, Wales, U.K.
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Abstract

There is an association between the development of cleavage domes, a texture reflecting the displacement of insoluble matrix grains by porphyroblasts growing under a bulk hydrostatic stress, and textural sector-zoning. This has been found in garnet, staurolite, chiastolite, pyrite and possibly emerald porphyroblasts. Sector-zoned porphyroblasts form by lineage growth normal to the crystal faces. This causes several distinctive textures (type 1 inclusions and type 2 intergrowths, inclusion bands, growth prongs), all of which are directly or indirectly related to displacement growth. Graphite or other carbonaceous material is ubiquitous in samples showing textural sector-zoning.

Keywords

graphitecleavage domematrix displacementporphyroblastssector-zoningtexturesgarnetstaurolitechiastolitepyriteemerald
Type
Research Article
Information
Mineralogical Magazine , Volume 55 , Issue 380 , September 1991 , pp. 379 - 396
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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