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Diffusion-controlled and replacement microtextures in alkali feldspars from two pegmatites: Perth, Ontario and Keystone, South Dakota

Published online by Cambridge University Press:  02 January 2018

Martin R. Lee*
Affiliation:
School of Geographical and Earth Sciences, University of Glasgow, Lilybank Gardens, Glasgow G12 8QQ, UK
Ian Parsons
Affiliation:
Grant Institute of Earth Science, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK
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Abstract

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Macro- and micro-perthitic microclines from pegmatites from Perth, Ontario (Wards catalogue 46 E 0510) and Keystone, South Dakota (Wards 46 E 5125) have been studied using light and electron microscopy. A sample of the type perthite from Perth, Ontario (Hunterian Museum, Glasgow, M2361)was compared using light microscopy. It differs in bulk composition and microtexture from the Wards sample. The Perth sample from Wards is a mesoperthite, with sub-periodic ∼mm-thick albite veins near (100), with irregular surfaces. The microcline has regular tartan twins and formed fromorthoclase by a continuous process. The Keystone sample is a microperthite, with non-periodic albite veins mainly in {110}. Irregular tartan twins, volumes of irregular microcline and subgrains suggest that the microcline formed by dissolution–reprecipitation. Microcline in both samplescontains semicoherent cryptoperthitic albite films that formed after the development of tartan twins. The bulk compositions of these intergrowths imply exsolution below ∼400°C. Diffusion parameters imply sustained heating for between 0.11 My at 400°C, 1.5 GPa and 8.4 My at 300°C,1 GPa. Unrealistic times are required at 200°C. Subsequently, the crystals reacted with a fluid leading to replacive growth of the vein perthites. Unusually, Albite twin composition planes in replacive subgrains have sub-periodic dislocations, formed by coalescence of advancing growthtwins. Processes that might lead to periodic, replacive intergrowths are discussed. The Perth and Keystone feldspars have been used for experimental work on dissolution during weathering and on anomalous thermoluminescence fading. Their microtextures make them unsuitable for obtaining propertiesthat can be extrapolated to feldspars in general.

Type
Research Article
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Copyright © The Mineralogical Society of Great Britain and Ireland 2015 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Copyright © The Mineralogical Society of Great Britain and Ireland 2015

References

Aberdam, D. (1965) Utilisation de la microscopie electronique pour l'etude des feldspaths: observations sur des microperthites. Science de la Terre, 6, 176.Google Scholar
Alling, H.L. (1921) The mineralography of the feldspars. Journal of Geology, 29, 193294.CrossRefGoogle Scholar
Alling, H.L. (1932) Perthites. American Mineralogist, 17, 4365.Google Scholar
Alling, H.L. (1938) Plutonic perthites. Journal of Geology, 46, 142165.CrossRefGoogle Scholar
Anbeek, C. (1992) The dependence of dissolution rates on grain size for some fresh and weathered feldspars. Geochimica et Cosmochimica Acta, 56, 39573970.CrossRefGoogle Scholar
Andersen, O. (1928) The genesis of some types of feldspar from granite pegmatites. Norsk Geologisk Tidsskrift, 10, 116207.Google Scholar
Arnaud, N.O. and Kelley, S.P. (1997) Argon behaviour in gem-quality orthoclase from Madagascar: Experiments and some consequences for 40Ar/39Ar geochronology. Geochimica Cosmochimica Acta, 61, 32273255.CrossRefGoogle Scholar
Bachinski, S.W. and Müller, G. (1971) Experimental determination of the microcline — low albite solvus. Journal of Petrology, 12, 329356.CrossRefGoogle Scholar
Balic-Zunic, T., Piazolo, S., Katerinopoulou, A. and Schmith, J.H. (2013) Full analysis of feldspar texture and crystal structure by combining X-ray and electron techniques. American Mineralogist, 98, 4152.CrossRefGoogle Scholar
Bambauer, H.U., Krause, C. and Kroll, H. (1989) TEM investigation of the sanidine/microcline transition across metamorphic zones. European Journal of Mineralogy, 1, 4758.CrossRefGoogle Scholar
Baril, M.C. and Huntley, D.J. (2003) Infrared stimulated luminescence and phosphorescence spectra of irradiated feldspars. Journal of Physics: Condensed Matter, 15, 80298048.Google Scholar
Brady, J.B. (1987) Coarsening of fine-scale exsolution lamellae. American Mineralogist, 72, 697706.Google Scholar
Brantley, S.L. and Mellott, N.P. (2000) Surface area and porosity of primary silicate minerals. American Mineralogist, 85, 17671783.CrossRefGoogle Scholar
Brown, W.L. and Parsons, I. (1984a) Exsolution and coarsening mechanisms and kinetics in an ordered cryptoperthite series. Contributions to Mineralogy and Petrology, 86, 318.CrossRefGoogle Scholar
Brown, W.L. and Parsons, I. (1984b) The nature of potassium feldspar, exsolution microtextures and development of dislocations as a function of composition in perthitic alkali feldspars. Contributions to Mineralogy and Petrology, 86, 335341.CrossRefGoogle Scholar
Brown, W.L. and Parsons, I. (1988) Zoned ternary feldspars in the Klokken intrusion: exsolution textures and mechanisms. Contributions to Mineralogy and Petrology, 98, 444454.CrossRefGoogle Scholar
Brown, W.L. and Parsons, I. (1989) Alkali feldspars: ordering rates, phase transformations and behaviour diagrams for igneous rocks. Mineralogical Magazine, 53, 2542.CrossRefGoogle Scholar
Brown, W.L. and Parsons, I. (1993) Storage and release of elastic strain energy: the driving force for low temperature reactivity and alteration of alkali feldspars. Pp. 267290 in: Defects and Processes in the Solid State: Geoscience Applications (The McLaren Volume) (J.N. Boland and J.D. Fitz Gerald, editors). Elsevier, Amsterdam, 470 pp.Google Scholar
Brown, W.L., Becker, S.M. and Parsons, I. (1983) Cryptoperthites and cooling rate in a layered syenite pluton. Contributions to Mineralogy and Petrology, 82, 1325.CrossRefGoogle Scholar
Carpenter, M.A. and Salje, E.K.H. (1994) Thermodynamics of nonconvergent cation ordering in minerals. American Mineralogist, 79, 10841098.Google Scholar
Cayzer, N. (2002) Feldspar microtextures and the cooling histories of high-grade terrains. PhD thesis, University of Edinburgh, UK, 300 pp.Google Scholar
Černý, P. (1994) Evolution of feldspars in granitic pegmatites. Pp. 501-540 in: Feldspars and Their Reactions (I. Parsons, editor). NATO ASI Series, C 421, Kluwer Academic Publishers, Dordrecht, 650 pp.Google Scholar
Coombs, D.S. (1954) Ferriferous orthoclase from Madagascar. Mineralogical. Magazine, 30, 409427.CrossRefGoogle Scholar
Eggleton, R.A. and Buseck, P.R. (1980) The orthoclase-microcline inversion: a high-resolution transmission electron microscope study and strain analysis. Contributions to Mineralogy and Petrology, 74, 123133.CrossRefGoogle Scholar
Evangelekakis, C., Kroll, H., Voll, G., Wenk, H.-R., Meisheng, H. and Köpcke, J. (1993) Low-temperature coherent exsolution in alkali feldspars from high-grade metamorphic rocks of Sri Lanka. Contributions to Mineralogy and Petrology, 114, 519532.CrossRefGoogle Scholar
Fitz Gerald, J.D. and McLaren, A.C. (1982) The microstructures of microcline from some granitic rocks and pegmatites. Contributions to Mineralogy and Petrology, 80, 219229.CrossRefGoogle Scholar
Fitz Gerald, J.D., Parsons, I. and Cayzer, N. (2006) Nanotunnels and pull-aparts: Defects of exsolution lamellae in alkali feldspars. American Mineralogist, 91, 772783.CrossRefGoogle Scholar
Foland, K.A. (1974) Ar diffusion in homogeneous orthoclase and an interpretation of Ar diffusion in K-feldspar. Geochimica Cosmochimica Acta, 38, 151166.CrossRefGoogle Scholar
Godfrey-Smith, D.I., Scallion, P. and Clarke, M.L. (2005) Beta dosimetry of potassium feldspars in sediment extracts using imaging microprobe analysis and beta counting. Geochronometria, 24, 712.Google Scholar
Hodson, M.E. (1998) Micropore surface area variation with grain size in unweathered alkali feldspars: Implications for surface roughness and dissolution studies. Geochimica et Cosmochimica Acta, 62, 34293435.CrossRefGoogle Scholar
Hodson, M.E., Lee, M.R. and Parsons, I. (1997) Origins of the surface roughness of unweathered alkali feldspar grains. Geochimica et Cosmochimica Acta, 61, 38853896.CrossRefGoogle Scholar
Hokanson, S.A. and Yund, R.A. (1986) Comparison of alkali interdiffusion rates for cryptoperthites. American Mineralogist, 71, 14091414.Google Scholar
Holdren, G.R., Jr. and Speyer, P.M. (1985) Reaction rate-surface area relationships during the early stages of weathering-I. initial observations. Geochimica et Cosmochimica Acta, 49, 675681.CrossRefGoogle Scholar
Holdren, G.R., Jr. and Speyer, P.M. (1987) Reaction rate-surface area relationships during the early stages of weathering-II. Data on eight additional feldspars. Geochimica et Cosmochimica Acta, 51, 23112318.CrossRefGoogle Scholar
Hovis, G.L., Delbove, F. and Roll Bose, M. (1991) Gibbs energies and entropies of K-Na mixing for alkali feldspars from phase equilibrium data: Implications for feldspar solvi and short-range order. American Mineralogist, 76, 913927.Google Scholar
Hunt, T.S. (1851) Examinations of some Canadian minerals. Philosophical Magazine, Series 4 (1), 322328.Google Scholar
Keefer, K.D. and Brown, G.E. (1978) Crystal structures and compositions of sanidine and high albite in cryptoperthitic intergrowth. American Mineralogist, 63, 12641273.Google Scholar
Kroll, H., Krause, C. and Voll, G. (1991) Disordering, reordering and unmixing in alkali feldspars from contact-metamorphosed quartzites. Pp. 267296 in: Equilibrium and Kinetics in Contact Metamorphism. (G. Voll, J. Töpel, D.R.M. Pattison and F. Seifert, editors). Springer-Verlag, Berlin.Google Scholar
Laves, F. and Soldatos, K. (1962) Plate perthite, a new perthitic intergrowth in microcline single crystals, a recrystallization product. Zeitschrift für Kristallographie, 117, 218226.CrossRefGoogle Scholar
Laves, F. and Soldatos, K. (1963) Die Albit/Mikroklin-Orientierungs-Beziehungen in Mikroklin-Verzwillinging und über unsymmetrische Albitausscheidung in Kryptoperthit. Zeitschrift für Kristallographie, 118, 69102.CrossRefGoogle Scholar
Lee, M.R. and Parsons, I. (1995) Microtextural controls of weathering of perthitic alkali feldspars. Geochimica et Cosmochimica Acta, 59, 44654488.CrossRefGoogle Scholar
Lee, M.R. and Parsons, I. (1997) Dislocation formation and albitization in alkali feldspars from the Shap granite. American Mineralogist, 82, 557570.CrossRefGoogle Scholar
Lee, M.R. and Parsons, I. (1998) Microtextural controls of diagenetic alteration of detrital alkali feldspars: a case study of the Shap conglomerate (Lower Carboniferous), North-west England. Journal of Sedimentary Research, 68, 198211.CrossRefGoogle Scholar
Lee, M.R., Waldron, K.A. and Parsons, I. (1995) Exsolution and alteration microtextures in alkali feldspar phenocrysts from the Shap granite. Mineralogical Magazine, 59, 6378.CrossRefGoogle Scholar
Lee, M.R., Waldron, K.A., Parsons, I. and Brown, W.L. (1997) Feldspar—fluid interactions in braid microperthites: pleated rims and vein microperthites. Contributions to Mineralogy and Petrology, 127, 291304.CrossRefGoogle Scholar
Lee, M.R., Hodson, M.E. and Parsons, I. (1998) The role of intragranular microtextures and micro structures in chemical and mechanical weathering: direct comparisons of experimentally and naturally weathered alkali feldspars. Geochimica et Cosmochimica Acta, 62, 27712788.CrossRefGoogle Scholar
Lee, M.R., Parsons, I., Edwards, P. and Martin, R.W. (2007) Identification of cathodoluminescence activators in zoned alkali feldspars by hyperspectral imaging and electron-probe microanalysis. American Mineralogist, 92, 243253.CrossRefGoogle Scholar
London, D. and Kontak, D.J. (2012) Granitic pegmatites: scientific wonders and economic bonanzas. Elements, 8, 257261.CrossRefGoogle Scholar
Lundström, I. (1970) Etch pattern and albite twinning in two plagioclases. Arkivför Mineralogi och Geologi, 5, 6391.Google Scholar
MacKenzie, W.S. and Smith, J.V (1962) Single crystal X-ray studies of crypto- and micro-perthites. Norsk Geologisk Tidsskrift, 42, 72103 [Feldspar Volume].Google Scholar
Meisl, N.K. and Huntley, D.J. (2005) Anomalous fading parameters and activation energies of feldspars. Ancient TL, 23, 17.Google Scholar
Norberg, N., Neusser, G., Wirth, R and Harlov, D. (2011) Microstructural evolution during experimental albitization of K-rich alkali feldspar. Contributions to Mineralogy and Petrology, 162, 531546.CrossRefGoogle Scholar
Norberg, N., Harlov, D., Neusser, G., Wirth, R., Rhede, D. and Moralez, L. (2013) Experimental development of patch perthite from synthetic cryptoperthite: Micro structural evolution and chemical equilibration. American Mineralogist, 98, 14291441.CrossRefGoogle Scholar
Orville, P.M. (1960) Petrology of several pegmatites in the Keystone district, Black Hills, South Dakota. Bulletin of the Geological Society of America, 71, 14671490.CrossRefGoogle Scholar
Orville, P.M. (1962) Alkali metasomatism and feldspars. Norsk Geologisk Tidsskrift, 42, 238316.Google Scholar
Orville, P.M. (1963) Alkali ion exchange between vapor and feldspar phases. American Journal of Science, 261, 210237.CrossRefGoogle Scholar
Parsons, I. (1978) Feldspars and fluids in cooling plutons. Mineralogical Magazine, 42, 117.CrossRefGoogle Scholar
Parsons, I. (2010) Feldspars defined and described: a pair of posters published by the Mineralogical Society. Sources and supporting information. Mineralogical Magazine, 74, 529551.CrossRefGoogle Scholar
Parsons, I. and Brown, W.L. (1984) Feldspars and the thermal history of igneous rocks. Pp. 317371 in: Feldspars and Feldspathoids. Structures, Properties and Ocurrences (W.L. Brown, editor). D. Reidel Publishing Company, Dordrecht, The Netherlands.Google Scholar
Parsons, I. and Brown, W.L. (1991) Mechanisms and kinetics of exsolution — structural control of diffusion and phase behavior in alkali feldspars. Pp. 304344 in: Diffusion, atomic ordering and mass transport. Advances in Physical Geochemistry vol. 8. (J. Ganguly, editor). Springer-Verlag, New York, Berlin, 567 pp.Google Scholar
Parsons, I. and Fitz Gerald, J.D. (2011) Coarsening kinetics of coexisting peristerite and film micro-perthite over 104 to 105 years. American Mineralogist, 96, 15751584.CrossRefGoogle Scholar
Parsons, I. and Lee, M.R. (2000) Alkali feldspars as microtextural markers of fluid flow. Pp. 2750 in: Hydrogeology of Crystalline Rocks (I. Stober and K. Bucher, editors). Kluwer Academic Publishers, Dordrecht, The Netherlands, 292 pp.Google Scholar
Parsons, I. and Lee, M.R. (2005) Minerals are not just chemical compounds. The Canadian Mineralogist, 43, 19591992.CrossRefGoogle Scholar
Parsons, I. and Lee, M.R. (2009) Mutual replacement reactions in alkali feldspars I: Microtextures and mechanisms. Contributions to Mineralogy and Petrology, 157, 641661.CrossRefGoogle Scholar
Parsons, I., Thompson, P., Lee, M.R. and Cayzer, N. (2005) Alkali feldspar microtextures as provenance indicators in siliciclastic rocks and their role in feldspar dissolution during transport and diagenesis. Journal of Sedimentary Research, 75, 921942.CrossRefGoogle Scholar
Parsons, I., Steele, D., Lee, M.R. and Magee, C. (2008) Titanium as a cathodoluminescence activator in alkali feldspars. American Mineralogist, 93, 875879.CrossRefGoogle Scholar
Parsons, I., Magee, C., Allen, C., Shelley, M.J. and Lee, M.R. (2009) Mutual replacement reactions in alkali feldspars II: Trace element partitioning and geother-mometry. Contributions to Mineralogy and Petrology, 157, 663687.CrossRefGoogle Scholar
Parsons, I., Fitz Gerald, J.D., Lee, J.K.W., Ivanic, T and Golla-Schindler, U. (2010) Time-temperature evolution of microtextures and contained fluids in a plutonic alkali feldspar during heating. Contributions to Mineralogy and Petrology, 160, 155180.CrossRefGoogle Scholar
Parsons, I., Fitz Gerald, J.D., Heizler, M.T., Heizler, L.L., Ivanic, T and Lee, M.R. (2013) Eight-phase alkali feldspars: Low-temperature cryptoperthite, peristerite and multiple replacement reactions in the Klokken intrusion. Contributions to Mineralogy and Petrology, 165, 931961.CrossRefGoogle Scholar
Parsons, I., Fitz Gerald, J.D. and Lee, M.R. (2015) Routine characterization and interpretation of complex alkali feldspar intergrowths. American Mineralogist, 100, 12771303.CrossRefGoogle Scholar
Putnis, A. (2002) Mineral replacement reactions: from macroscopic observations to micropscopic mechan-isms. Mineralogical Magazine, 66, 689708.CrossRefGoogle Scholar
Rogers, J.R. and Bennett, P.C. (2004) Mineral stimulation of subsurface microorganisms: release of limiting nutrients from silicates. Chemical Geology, 203, 91108.CrossRefGoogle Scholar
Rollinson, H.R. (1982) Evidence from feldspar compositions of high temperatures in granite sheets in the Scourian complex, NW Scotland. Mineralogical Magazine, 46, 7376.CrossRefGoogle Scholar
Sánchez-Muñoz, L., Nistor, N., Van Tendeloo, G. and Sanz, J. (1998) Modulated structures in KAlSi3O8: a study by high resolution electron microscopy and 29Si MAS-NMR spectroscopy. Journal of Electron Microscopy, 47, 1728.CrossRefGoogle Scholar
Sánchez-Muñoz, L., Correcher, V., Turrero, M.J., Cremades, A. and García-Guinea, J. (2006) Visualization of elastic strain fields by the spatial distribution of the blue luminescence in a twinned microcline crystal. Physics and Chemistry of Minerals, 33, 639650.CrossRefGoogle Scholar
Sánchez-Muñoz, L., García-Guinea, J., Beny, J.-M., Rouer, O., Campos, R., Sanz, J. and de Moura, O.J. M (2008) Mineral self-organization during the orthoclase-microcline transformation in a granite pegmatite. European Journal of Mineralogy, 20, 439–46.CrossRefGoogle Scholar
Sánchez-Muñoz, L., García-Guinea, J., Zagorsky, V.Y., Juwono, T., Modreski, P.J., Cremades, A., Van Tendeloo, G. and De Moura, O.J.M. (2012) The evolution of twin patterns in perthitic K-feldspar from granitic pegmatites. The Canadian Mineralogist, 50, 9891024.CrossRefGoogle Scholar
Sheets, J.M. and Tettenhorst, R.T. (1997) Crystallographic controls on the alteration of microcline perthites from the Spruce Pine District, North Carolina. Clays and Clay Minerals, 45, 404417.CrossRefGoogle Scholar
Smith, J.V. (1974) Feldspar Minerals, first edition, volume 2. Springer Verlag, Berlin, pp. 690.Google Scholar
Smith, J.V. and Brown, W.L. (1988) Feldspar Minerals, second edition, volume 1. Springer Verlag, Berlin, pp. 828.Google Scholar
Soldatos, K. (1962) Über die kryptoperthitische Albit-Ausscheidung in Mikroklinperthiten. Norsk Geologisk Tidskrifft, 42(2) 180192.Google Scholar
Stoessell, R.K. and Pittman, E.D. (1990) Secondary porosity revisited: the chemistry of feldspar dissolution by carboxylic acids and anions. American Association of Petroleum Geologists Bulletin, 74, 17951805.Google Scholar
Thomson, T. (1843) Notice of some new Minerals. Philosophical Magazine, Series 3, 22, 188194.Google Scholar
Tuttle, O.F. and Bowen, N.L. (1958) Origin of granite in the light of experimental studies in the system NaAlSi3O8-KAlSi3O8-SiO2-H2O. Geological Society of America, Memoir, 74, xi + 153.Google Scholar
Waldron, K.A., Parsons, I. and Brown, W.L. (1993) Solution-redeposition and the orthoclase-microcline transformation: evidence from granulites and relevance to 1 8O exchange. Mineralogical Magazine, 57, 687695.CrossRefGoogle Scholar
Waldron, K.A., Lee, M.R. and Parsons, I. (1994) The microstructures of perthitic alkali feldspars revealed by hydrofluoric acid etching. Contributions to Mineralogy and Petrology, 116, 360364.CrossRefGoogle Scholar
Walker, F.D.L., Lee, M.R. and Parsons, I. (1995) Micropores and micropermeable texture in alkali feldspars: geochemical and geophysical implications. Mineralogical Magazine, 59, 505534.CrossRefGoogle Scholar
Wartho, J-A., Kelley, S.P., Brooker, R.A., Carroll, M.R., Villa, I.M. and Lee, M.R. (1999) Direct measurement of Ar diffusion profiles in a gem-quality Madagascar K-feldspar using the ultra-violet laser ablation micro-probe (UVLAMP). Earth and Planetary Science Letters, 170, 141153.CrossRefGoogle Scholar
White, J.C. and Barnett, R.L. (1990) Micro structural signatures and glide twins in microcline, Hemlo, Ontario. The Canadian Mineralogist, 28, 757769.Google Scholar
Willaime, C. and Brown, W.L. (1974) A coherent elastic model for the determination of the orientation of exsolution boundaries: application to the feldspars. Acta Crystallographica A, 30, 313331.Google Scholar
Willaime, C. and Gandais, M. (1972) Study of exsolution in alkali feldspars. Calculation of elastic stresses inducing periodic twins. Physics Status Solidi (a), 9, 529539.CrossRefGoogle Scholar
Worden, R.H., Walker, F.D.L., Parsons, I. and Brown, W. L (1990) Development of microporosity, diffusion channels and deuteric coarsening in perthitic alkali feldspars. Contributions to Mineralogy and Petrology, 104, 507515.CrossRefGoogle Scholar
Yund, R.A. (1974) Coherent exsolution in the alkali feldspars. Pp. 173-183 in: Geochemical Transport and Kinetics (A.W Hofmann, B.J. Giletti, H.S. Yoder, Jr. and R.A. Yund, editors). Carnegie Institution of Washington publication 634. Google Scholar
Yund, R.A. and Davidson, P. (1978) Kinetics of lamellar coarsening in cryptoperthites. American Mineralogist, 63, 470477.Google Scholar