Myrmekite and muscovite developed by retrograde metamorphism at Broken Hill, New South Wales
- Resource Type
- Authors
- Evan R. Phillips; D. M. Ransom; R. H. Vernon
- Source
- Mineralogical Magazine. 38:570-578
- Subject
- 010504 meteorology & atmospheric sciences
Muscovite
Geochemistry
Mineralogy
Metamorphism
engineering.material
010502 geochemistry & geophysics
Feldspar
01 natural sciences
Myrmekite
Albite
Geochemistry and Petrology
visual_art
visual_art.visual_art_medium
engineering
Quartz
Pegmatite
Geology
0105 earth and related environmental sciences
Gneiss
- Language
- ISSN
- 1471-8022
0026-461X
SummaryRetrograde metamorphism of gneisses and pegmatites leads in part to the destruction of feldspar and its replacement by late-stage lobate myrmekite and muscovite. Reactions promoted by retrogression suggest a range in volume of quartz production that may supplement that developed by exsolution and lead to deviations from the strict proportionality relationship suggested by previous workers. There is no need, however, to propose that quartz in myrmekite originates by constriction of pre-existing quartz within exsolved albite.