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Fe-bearing trioctahedral micas from Mont Saint-Hilaire, Québec, Canada

Published online by Cambridge University Press:  05 July 2018

A. E. Lalonde ,
D. G. Rancourt  and
G. Y. Chao
A. E. Lalonde
Affiliation:
Department of Geology, Ottawa-Carleton Geoscience Center, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
D. G. Rancourt
Affiliation:
Department of Physics, Ottawa-Carleton Geoscience Center, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
G. Y. Chao
Affiliation:
Department of Earth Sciences, Ottawa-Carleton Geoscience Center, Carleton University, Ottawa, Ontario, K1H 5P6, Canada
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Abstract

We document the occurrence of Fe-bearing trioctahedral micas in the Poudrette quarry in the Mont Saint-Hilaire alkaline intrusion, characterize them by microprobe analysis, Mössbauer spectroscopy, X-ray diffraction, and optical measurements, describe their mineral chemistry, and discuss their petrological significance. In the nepheline and sodalite syenite, biotite and annite occur as coarse crystals characterized by low Al content (typically 2 atoms per formula unit, a.f.u.), high Mn content (typically 0.2 to 0.8 a.f.u.) and variable Fe/(Fe+Mg) values from 0.61 to 0.97. In the gabbro, biotite is less Fe-rich, has lower Mn content and high Ti content. Phlogopite is found as small metamorphic crystals in marble xenoliths within the syenite and siderophyllite occurs as large crystals in a metasomatized albitite dyke. Fe3+/Fetot values extend from 0.079 in the siderophyllite to 0.282 in a high-Fe3+ annite. All of the micas except for the phlogopite have high contents of (Fe3+)iv (∼0.13 to 0.45 a.f.u.) despite the high availability of Al in the rocks. We suggest that the high (Fe3+)iv amounts are caused by the high Mn abundance via a local structural mechanism. The great variety of mica encountered at Mont Saint-Hilaire reflects the highly heterogeneous conditions that prevailed during magmatic and postmagmatic crystallization in this intrusion.

Keywords

biotitephlogopiteannitesiderophyllitemineral chemistryMössbauer spectroscopyMont Saint-Hilaire, Canada
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 400 , June 1996 , pp. 447 - 460
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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