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Aluminium in quartz as an indicator of the temperature of formation of agate

Published online by Cambridge University Press:  05 July 2018

J. Götze ,
M. Plötze ,
M. Tichomirowa ,
H. Fuchs  and
J. Pilot
J. Götze*
Affiliation:
TU Bergakademie Freiberg, Institute of Mineralogy, D-09596 Freiberg, Germany
M. Plötze
Affiliation:
TU Bergakademie Freiberg, Institute of Mineralogy, D-09596 Freiberg, Germany
M. Tichomirowa
Affiliation:
TU Bergakademie Freiberg, Institute of Mineralogy, D-09596 Freiberg, Germany
H. Fuchs
Affiliation:
TU Bergakademie Freiberg, Institute of Mineralogy, D-09596 Freiberg, Germany
J. Pilot
Affiliation:
TU Bergakademie Freiberg, Institute of Mineralogy, D-09596 Freiberg, Germany
*
*E-mail: [email protected]
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Abstract

An ‘Al-thermometer’ was applied to agate samples of volcanic parent rocks to provide information about the temperature of agate formation. The temperatures were calculated from concentrations of [AlO4]0 centres determined by electron paramagnetic resonance (EPR) measurements. The calculations for agate bands in some cases yield temperatures of up to 655°C, which are assumed to be invalid; they are thought to be artifacts resulting from non-equilibrium crystallization processes. In contrast, the formation temperatures (60–198°C) estimated for associated quartz incrustations within the agate geodes are in good accord with those calculated from oxygen isotope data. Direct estimation of the formation temperatures of agates is problematic. The best results will be obtained by analyses of associated phanerocrystalline quartz incrustations.

Keywords

agatequartzaluminiumEPRoxygen isotopestemperature
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 3 , June 2001 , pp. 407 - 413
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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Footnotes

†

Present address: ETH Zurich, Institute of Geotechnical Engineering, CH-8093 Zurich, Switzerland

References

Agel, A. and Petrov, I. (1990) Substitutional aluminium in the quartz lattice as indicator of the formation temperature. Eur. J. Mineral., 2, Beihefte 1 (in German).Google Scholar
Blankenburg, H.- J. (1988) Agate. Dt. Verl. Grundstoffind., Leipzig (in German).Google Scholar
Dennen, W.H., Blackburn, W.H. and Quesada, A. (1970) Aluminum in quartz as a geothermometer. Contrib. Mineral. Petrol., 27, 332–42.CrossRefGoogle Scholar
Fallick, A.E., Jocelyn, J., Donelly, T., Guy, M. and Behan, C. (1985) Origin of agates in volcanic rocks of Scotland. Nature, 313, 672–4.CrossRefGoogle Scholar
Fallick, A.E., Jocelyn, J. and Hamilton, P.J. (1987) Oxygen and hydrogen stable isotope systematics in Brazilian agates. Pp. 99–117 in: Geochemistry and Mineral Formation in the Earth Surface (Rodriguez-Clemente, R. and Tardy, Y., editors). Consejo Superior de Investigaciones Cientificas, Madrid.Google Scholar
Flörke, O.W. (1972) Transport and deposition of SiO2 with H2O under supercritical conditions. Kristall und Technik, 7, 159–66.CrossRefGoogle Scholar
Flörke, O.W., Köhler-Herbertz, B., Langer, K. and Tönges, I. (1982) Water in microcrystalline quartz of volcanic origin: agates. Contrib. Mineral. Petrol., 80, 324–33.CrossRefGoogle Scholar
Godovikov, A.A., Ripinen, O.I. and Motorin, S.G. (1987) Agates. Nedra, Moscow (in Russian).Google Scholar
Götze, J., Nasdala, L., Kleeberg, R. and Wenzel, M. (1998) Occurrence and distribution of “moganite” in agate/chalcedony: A combined micro-Raman, Rietveld, and cathodoluminescence study. Contrib. Mineral. Petrol., 133, 96–105.CrossRefGoogle Scholar
Götze, J., Plötze, M., Fuchs, H. and Habermann, D. (1999) Defect structure and luminescence behaviour of agate – results of electron paramagnetic resonance (EPR) and cathodoluminesc ence (CL) studies. Mineral. Mag., 63, 149–63.CrossRefGoogle Scholar
Götze, J., Tichomirowa, H., Fuchs, H., Pilot, J. and Sharp, Z.D. (2001) Geochemistry of agates: a trace element and stable isotope study. Chem. Geol. (in press).CrossRefGoogle Scholar
Griffiths, J.H.E., Owen, J. and Ward, I.M. (1954) Paramagnetic resonance in neutron-irradiated diamond and smoky quartz. Nature, 173, 439–42.CrossRefGoogle Scholar
Harder, H. (1993) Agates- formation as a multi component colloid chemical precipitation at low temperatures. Neues Jahrb. Miner. Mh., 31–48.Google Scholar
Harris, C. (1989) Oxygen-isotope zonation of agates from Karoo volcanics of the Skeleton Coast, Namibia. Amer. Mineral., 74, 476–81.Google Scholar
Heaney, P.J. (1993) A proposed mechanism for the growth of chalcedony. Contrib. Mineral. Petrol., 115, 66–74.CrossRefGoogle Scholar
Heaney, P.J. and Davis, A.M. (1995) Observation and origin of self-organized textures in agates. Science, 269, 1562–5.CrossRefGoogle ScholarPubMed
Holzhey, G. (1993) Occurrence and origin of agates and paragenetic minerals from Permian volcanics of the Thuringian forest. PhD thesis, TU Bergakademie Freiberg (in German).Google Scholar
Ingerson, E. and Weshow, R.L. (1965) Oxygen isotope fractionation in the system quartz-water. Geokhimiya, 944–60 (in Russian).Google Scholar
Kita, I. and Taguchi, S. (1986) Oxygen isotopic behaviour of precipitating silica from geothermal water. Geoch. J., 20, 153–7.CrossRefGoogle Scholar
Landmesser, M. (1992) On the geothermometry and theory of agates. Mitt. POLLICHIA, 79, 159–201 (in German).Google Scholar
Matsuhisa, Y., Goldsmith, J.R. and Clayton, R.N. (1979) Oxygen isotopic fractionation in the system quartz-albite-anorthite-water. Geochim. Cosmochim. Acta, 43, 1131–40.CrossRefGoogle Scholar
Merino, E., Wang, Y. and Deloule, E. (1995) Genesis of agates in flood basalts; twisting of chalcedony fibers and trace-element geochemistry. Amer. J. Sci., 295, 1156–76.CrossRefGoogle Scholar
Moiseev, B.M. (1985) Natural Radiation Processes in Minerals. Nedra, Moscow (in Russian).Google Scholar
Moxon, J.T. (1996) Agate: Microstructure and Possible Origin. Terra, Doncaster, UK.Google Scholar
Nettar, D. and Villafranca, J.J. (1985) A program for EPR powder spectrum simulation. J. Magn. Res., 64, 61–5.Google Scholar
Nuttall, R.H.D. and Weil, J.A. (1981) The magnetic properties of the oxygen-hole aluminium centers in crystalline SiO2. I. [AlO4]0 . Canad. J. Phys., 59, 1696–707.CrossRefGoogle Scholar
Oehler, J.H. (1976) Hydrothermal crystallization of silica gel. Geol. Soc. Amer. Bull., 87, 1143–52.2.0.CO;2>CrossRefGoogle Scholar
Plötze, M. (1995) Investigation of quartz, scheelite and fluorite from hydrothermal rare-metal deposits by EPR. PhD thesis, TU Bergakademie Freiberg (in German).Google Scholar
Schrön, W., Kaiser, G. and Bombach, G. (1983) Trace element analysis in geological samples by emission spectrography with semiautomatic evaluation. Z. ang. Geol., 11, 559–65 (in German).Google Scholar
Scotford, D.M. (1975) A test of aluminum in quartz as a geothermometer. Amer. Mineral., 60, 139–42.Google Scholar
Sharp, Z.D. (1990) A laser-based microanalytical method for the in situ determination of oxygen isotope ratios of silicates and oxides. Geochim. Cosmochim. Acta, 54, 1353–7.CrossRefGoogle Scholar
Sharp, Z.D. (1992) In situ laser microprobe techniques for stable isotope analysis. Chem. Geol., 101, 3–19.Google Scholar
Valley, J.W., Taylor, H.P. and O'Neil, J.R. (1986) Stable Isotopes in High Temperature Geological Processes. Reviews in Mineralogy, 16. Mineralogical Society of America, Washington, D.C. CrossRefGoogle Scholar
Wang, Y. and Merino, E. (1990) Self-organizational origin of agates: Banding, fiber twisting, composition, and dynamic crystallization model. Geochim. Cosmochim. Acta, 54, 1627–38.CrossRefGoogle Scholar
White, J.F. and Corwin, J.F. (1961) Synthesis and origin of chalcedony. Amer. Mineral., 46, 112–9.Google Scholar