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

  • A. E. Lalonde (a1), D. G. Rancourt (a2) and G. Y. Chao (a3)

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.

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Adams, F.D. (1903) The Monteregian Hills — A Canadian petrographical province. J. GeoL, 11, 239–82.
Appleman, D.E. and Evans, H.T. Jr. (1973) Job 9214: Indexing and least-squares refinement of powder diffraction data. United States Geological Survey Computer Contribution, 20.
Bailey, S.W. (1984) Classification and structures of micas. Reviews in Mineralogy, 13, 1—12.
Coats, R.R. and Fahey, J.J. (1944) Siderophyllite from Brooks Mountain, Alaska. Amer. Mineral, 29, 373–7.
Currie, K.L., Eby, G.N. and Gittins, J. (1986) The petrology of the Mont Saint-Hilaire complex, southern Quebec: An alkaline gabbro-peralkaline syenite association. Lithos, 19, 65–81.
Deer, W.A., Howie, R.A. and Zussman J. (1962) Rockforming Minerals, 3. Sheet SilicatesLongmans. Fairbarn, H.W., Faure, G., Pinson, W.H., Hurley, P.M. and Powell, J.L. (1963) Whole rock age and discordant biotite in the Monteregian igneous province, Quebec. J. Geophys. Res., 68, 6515–22.
Fleischer, M. and Mandarino, J.A. (1991) Glossary of mineral species 1991.The Mineralogical Record. Foster, M.D., (1960) Interpretation of the composition of trioctahedral micas. United States Geological Survey Professional Paper, 354-B.
Gilbert, L.A. and Foland, K.A. (1986) The Mont Saint Hilaire plutonic complex: occurrence of excess 40Ar and short intrusion history. Canad. J. Earth Sci., 23, 948–58.
Gold, D.P. (1967) Alkaline ultrabasic rocks in the Montreal area, Quebec. In: Ultrabasic related rocks (Wyllie, P.J., ed.), p. 288302. John Wiley.
Greenwood, R.C. and Edgar, A.D. (1984) Petrogenesis of the gabbros from Mt. St. Hilaire, Quebec, Canada. Geol, 7, 19, 353–76.
Hiroi, Y., Karada-Kondo, H. and Ogo, Y. (1992) Cuprian manganoan phlogopite in highly oxidized Mineoka siliceous schists from Kamogawa, Boso Peninsula, central Japan. Amer. Mineral., 77, 1099–106.
Horvath, L. and Gault, R.A. (1990) The mineralogy of Mont Saint-Hilaire, Quebec. Mineral. Rec., 21, 284–359.
Kretz, R. (1983) Symbols for rock-forming minerals. Amer. Mineral., 68, 277–9.
Levillain, C., Maurel, P. and Menil, F. (1981) Mossbauer studies of synthetic and natural micas on the polylithionite-siderophyllite join. Phys. Chem. Minerals, 7, 71–76.
Lewis, H.C. (1880) On siderophyllite - A new mineral. Proc. Acad. Nat Sci. Philadelphia, 254—5.
Mandarino, J.A. and Anderson, V. (1989) Monteregian Treasures: the Minerals of Mont Saint-Hilaire, Quebec Cambridge University Press.
Nockolds, S.R. and Richey, J.E. (1939) Replacement veins in the Mourne mountains granites, Northern Ireland. Amer. J. Sci., 237, 27–47.
Rancourt, D.G. (1989) Accurate site populations from Mossbauer spectroscopy. Nucl. Inst. Meth. Phys. Res. B44, 199210.
Rancourt, D.G. (1994a) Mossbauer spectroscopy of minerals. I. Inadequacy of Lorentzian-line doublets in fitting spectra arising from quadrupole splitting distributions. Phys. Chem. Minerals, 21, 244–9.
Rancourt, D.G. (1994b) Mossbauer spectroscopy of minerals. II. Problem of resolving cis and trans octahedral Fe2+ sites. Phys. Chem. Minerals, 21, 250–7.
Rancourt, D.G. and Ping, J.Y. (1991) Voigt-based methods for arbitrary-shape static hyperfine parameter distributions in Mossbauer spectroscopy. Nucl Inst. Meth. Phys. Res. B53, 85—97.
Rancourt, D.G., Dang, M.-Z. and Lalonde, A.E. (1992) Mossbauer spectroscopy of tetrahedral Fe3+ in trioctahedral micas. Amer. Mineral, 77, 34–43.
Rancourt, D.G., McDonald, A.M., Lalonde, A.E. and Ping, J.Y. (1993) Mossbauer absorber thicknesses for accurate site populations in Fe-bearing minerals. Amer. Mineral, 78, 1–7.
Rancourt, D.G., Christie, I.A.D., Lamarche, G. Swainson, I. and Flandrois, S. (1994a) Magnetism of synthetic and natural annite mica: Ground state and nature of excitations in an exchange-wise twodimensional easy-plane ferromagnet. J. Magnetism and Magnetic Materials, 138, 31–44.
Rancourt, D.G., Ping, J.Y. and Berman, R.G. (1994b) Mossbauer spectroscopy of minerals. III. Octahedral- site Fe2+ quadrupole splitting distributions in the phlogopite-annite series. Phys. Chem. Minerals, 21, 258–67.
Rancourt, D.G., Christie, I.A.D., Royer, M., Kodama, H., Robert, J.-L., Lalonde, A.E. and Murad, E. (1994c) Determination of accurate [4]Fe3+, [6]Fe3+, [6]pe2+ sjte populations in synthetic annite by Mossbauer spectroscopy. Amer. Mineral., 79, 51–62.
Robert, J.-L. (1976) Titanium solubility in synthetic phlogopitc solid solutions. Chem. GeoL, 17, 213–27.
Robert, J.-L. and Maury, R.C. (1979) Natural occurrence of a (Fe, Mn, Mg) tetrasilicic potassium mica. Contrib. Mineral. Petrol., 68, 117–23.
Rutherford, M.J. (1973) The phase relations of aluminous iron biotites in the system KAlSi308- KAlSiO4-Al2O3-Fe-O-H. J. Petrol., 14, 159–80.
Winchell, A.N. and Winchell, H. (1951) Elements of Optical Mineralogy, part 2. John Wiley and Sons.

Keywords

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

  • A. E. Lalonde (a1), D. G. Rancourt (a2) and G. Y. Chao (a3)

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