Porphyroblast textural sector-zoning and matrix displacement
| Autor: | A. H. N. Rice, J. I. Mitchell |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
010504 meteorology & atmospheric sciences
Geochemistry Mineralogy Cleavage (crystal) 010502 geochemistry & geophysics 01 natural sciences Texture (geology) Chiastolite Matrix (geology) Geochemistry and Petrology visual_art Staurolite Porphyroblast visual_art.visual_art_medium Inclusion (mineral) Crystal twinning Geology 0105 earth and related environmental sciences |
| Zdroj: | Mineralogical Magazine. 55:379-396 |
| ISSN: | 1471-8022 0026-461X |
| DOI: | 10.1180/minmag.1991.055.380.08 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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