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Zircon from diamondiferous kyanite gneisses of the Kokchetav massif: Revealing growth stages using an integrated cathodoluminescence, Raman spectroscopy and electron microprobe approach

Published online by Cambridge University Press:  25 November 2020

Olga V. Rezvukhina*
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia
Andrey V. Korsakov
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia
Dmitriy I. Rezvukhin
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia
Denis S. Mikhailenko
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua st., Tianhe, Guangzhou, 510640, China
Dmitry A. Zamyatin
Zavaritsky Institute of Geology and Geochemistry UB RAS, 15 Vonsovskogo st., Ekaterinburg, 620016, Russia Institute of Physics and Technology, Ural Federal University, 21 Mira st., Ekaterinburg, 620002, Russia
Evgeny D. Greshnyakov
School of Natural Sciences and Mathematics, Ural Federal University, 51 Lenin Ave., Ekaterinburg, 620000, Russia
Vladimir Ya. Shur
School of Natural Sciences and Mathematics, Ural Federal University, 51 Lenin Ave., Ekaterinburg, 620000, Russia
*Author for correspondence: Olga V. Rezvukhina, Email:


Zircon crystals from diamondiferous kyanite gneisses of the Barchi-Kol area (Kokchetav massif, Northern Kazakhstan) have been investigated by a combined application of cathodoluminescence (CL), Raman spectroscopy and electron probe microanalysis (EPMA). The zircon crystals exhibit up to four distinct domains characterised by significantly different CL signatures and parameters of the ν3(SiO4) (1008 cm–1) Raman band (i.e. full width at half maximum, position and intensity). Extremely metamict zircon cores (Domain I) host inclusions of low-pressure minerals (quartz and graphite) and the outer mantles (Domain III) are populated by ultrahigh-pressure relicts (diamond and coesite), whereas inner mantles (Domain II) and overgrowth rim zones (Domain IV) are inclusion free. Both the zircon cores and rims have very low Ti concentrations, implying formation temperatures below 760°C. The Ti content in the inner mantles (up to 40 ppm) is indicative of temperatures in the 760–880°C range. The temperature estimates for the outer mantles are 900–940°C, indicating a pronounced overlap with the peak metamorphic values yielded by the Zr-in-rutile geothermometer for the same rocks (910–950°C). The internal textures of the zircons and the occurrence of index minerals within the distinct domains allow us to unravel the stages of the complex metamorphic history recorded in the zircon. Our data show that the zircon cores are inherited seeds of pre-metamorphic (magmatic?) origin, the inner mantles were formed on the prograde metamorphic stage, the outer mantles record ultrahigh-pressure metamorphism and the outermost rims mark the retrograde metamorphic stage. The observed zircon internal textures are thus clearly correlated with distinct growth events, and in some examples reflect a major part of the metamorphic history. It is concluded that the combined application of the CL, Raman spectroscopy and EPMA techniques to zircon offers significant potential for deciphering the metamorphic evolution of deeply-subducted rocks.

Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Associate Editor: Craig Storey


Buslov, M.M., Dobretsov, N.L., Vovna, G.M. and Kiselev, V.I. (2015) Structural location, composition, and geodynamic nature of diamond-bearing metamorphic rocks of the Kokchetav subduction-collision zone of the Central Asian Fold Belt (northern Kazakhstan). Russian Geology and Geophysics, 56, 6480.CrossRefGoogle Scholar
Caruba, R., Baumer, A., Ganteaume, M. and Iacconi, P. (1985) An experimental study of hydroxyl groups and water in synthetic and natural zircons: a model of the metamict state. American Mineralogist, 70, 12241231.Google Scholar
Campomenosi, N., Rubatto, D., Hermann, J., Mihailova, B., Scambelluri, M. and Alvaro, M. (2020) Establishing a protocol for the selection of zircon inclusions in garnet for Raman thermobarometry. American Mineralogist: Journal of Earth and Planetary Materials, 105, 9921001.CrossRefGoogle Scholar
Chakoumakos, B.C., Murakami, T., Lumpkin, G.R. and Ewing, R.C. (1987) Alpha-decay-induced fracturing in zircon: the transition from the crystalline to the metamict state. Science, 236, 15561559.CrossRefGoogle ScholarPubMed
Chopin, C. and Sobolev, N.V. (1995) Principal mineralogic indicators of UHP in crustal rocks. Pp. 96131 in: Ultrahigh-Pressure Metamorphism (Coleman, R.G. and Wang, X., editors). Cambridge University Press, UK.CrossRefGoogle Scholar
Claoué-Long, J.C., Sobolev, N.V., Shatsky, V.S. and Sobolev, A.V. (1991) Zircon response to diamond-pressure metamorphism in the Kokchetav massif, USSR. Geology, 19, 710713.2.3.CO;2>CrossRefGoogle Scholar
Corfu, F., Hanchar, J.M., Hoskin, P.W.O. and Kinny, P. (2003) Atlas of zircon textures. Pp. 469500 in: Zircon (Hanchar, J.M. and Hoskin, P.W.O., editors). Reviews in Mineralogy and Geochemistry, 53. Mineralogical Society of America and the Geochemical Society, Chantilly, Virginia, USA.CrossRefGoogle Scholar
Dobretsov, N.L. (1998) Structural and geodynamic evolution of diamond-bearing metamorphic rocks of Kokchetav Massif, Kazakhstan. Russian Geology and Geophysics, 39, 16501661.Google Scholar
Dobretsov, N.L. and Shatsky, V.S. (2004) Exhumation of high-pressure rocks of the Kokchetav massif: facts and models. Lithos, 78, 307318.CrossRefGoogle Scholar
Dobretsov, N.L., Shatsky, V.S. and Sobolev, N.V. (1995a) Comparison of the Kokchetav and Dabie Shan metamorphic complexes: coesite-and diamond-bearing rocks and UHP-HP accretional-collisional events. International Geology Review, 37, 636656.CrossRefGoogle Scholar
Dobretsov, N.L., Sobolev, N.V., Shatsky, V.S., Coleman, R.G. and Ernst, W.G. (1995b) Geotectonic evolution of diamondiferous paragneisses, Kokchetav Complex, northern Kazakhstan: The geologic enigma of ultrahigh-pressure crustal rocks within a Paleozoic foldbelt. Island Arc, 4, 267279.CrossRefGoogle Scholar
Dobretsov, N.L., Buslov, M.M., Zhimulev, F.I., Travin, A.V. and Zayachkovsky, A.A. (2006) Vendian-Early Ordovician geodynamic evolution and model for exhumation of ultrahigh-and high-pressure rocks from the Kokchetav subduction-collision zone (northern Kazakhstan). Russian Geology and Geophysics, 47, 424440.Google Scholar
Ewing, R.C., Meldrum, A., Wang, L., Weber, W.J. and Corrales, L.R. (2003) Radiation effects in zircon. Pp. 387425 in: Zircon (Hanchar, J.M. and Hoskin, P.W.O., editors). Reviews in Mineralogy and Geochemistry, 53. Mineralogical Society of America and the Geochemical Society, Chantilly, Virginia, USA.CrossRefGoogle Scholar
Farges, F. and Calas, G. (1991) Structural analysis of radiation damage in zircon and thorite: An X-ray absorption spectroscopic study. American Mineralogist, 76, 6073.Google Scholar
Ferry, J.M. and Watson, E.B. (2007) New thermodynamic models and revised calibrations for the Ti-in-zircon and Zr-in-rutile thermometers. Contributions to Mineralogy and Petrology, 154, 429437.CrossRefGoogle Scholar
Hacker, B.R., Calvert, A., Zhang, R.Y., Ernst, W.G. and Liou, J.G. (2003) Ultrarapid exhumation of ultrahigh-pressure diamond-bearing metasedimentary rocks of the Kokchetav Massif, Kazakhstan? Lithos, 70, 6175.CrossRefGoogle Scholar
Hanchar, J.M. and Miller, C.F. (1993) Zircon zonation patterns as revealed by cathodoluminescence and backscattered electron images: implications for interpretation of complex crustal histories. Chemical Geology, 110, 113.CrossRefGoogle Scholar
Hermann, J., Rubatto, D., Korsakov, A.V. and Shatsky, V.S. (2001) Multiple zircon growth during fast exhumation of diamondiferous, deeply subducted continental crust (Kokchetav Massif, Kazakhstan). Contributions to Mineralogy and Petrology, 141, 6682.CrossRefGoogle Scholar
Hermann, J., Rubatto, D., Korsakov, A. and Shatsky, V.S. (2006) The age of metamorphism of diamondiferous rocks determined with SHRIMP dating of zircon. Russian Geology and Geophysics, 47, 513520.Google Scholar
Katayama, I., Zayachkovsky, A.A. and Maruyama, S. (2000) Prograde pressure–temperature records from inclusions in zircons from ultrahigh-pressure–high-pressure rocks of the Kokchetav Massif, northern Kazakhstan. Island Arc, 9, 417427.CrossRefGoogle Scholar
Katayama, I., Maruyama, S., Parkinson, C.D., Terada, K. and Sano, Y. (2001) Ion micro-probe U–Pb zircon geochronology of peak and retrograde stages of ultrahigh-pressure metamorphic rocks from the Kokchetav massif, northern Kazakhstan. Earth and Planetary Science Letters, 188, 185198.CrossRefGoogle Scholar
Katayama, I., Muko, A., Iizuka, T., Maruyama, S., Terada, K., Tsutsumi, Y., Sano, Y., Zhang, R.Y. and Liou, J.G. (2003) Dating of zircon from Ti-clinohumite–bearing garnet peridotite: Implication for timing of mantle metasomatism. Geology, 31, 713716.CrossRefGoogle Scholar
Katayama, I. and Maruyama, S. (2009) Inclusion study in zircon from ultrahigh-pressure metamorphic rocks in the Kokchetav massif: an excellent tracer of metamorphic history. Journal of the Geological Society, 166, 783796.CrossRefGoogle Scholar
Korsakov, A.V., Shatsky, V.S., Sobolev, N.V. and Zayachokovsky, A.A. (2002) Garnet-biotite-clinozoisite gneiss: a new type of diamondiferous metamorphic rock from the Kokchetav Massif. European Journal of Mineralogy, 14, 915928.CrossRefGoogle Scholar
Korsakov, A.V., Toporski, J., Dieing, T., Yang, J. and Zelenovskiy, P.S. (2015) Internal diamond morphology: Raman imaging of metamorphic diamonds. Journal of Raman Spectroscopy, 46, 880888.CrossRefGoogle Scholar
Liao, J., Malusà, M.G., Zhao, L., Baldwin, S.L., Fitzgerald, P.G. and Gerya, T. (2018) Divergent plate motion drives rapid exhumation of (ultra) high pressure rocks. Earth and Planetary Science Letters, 491, 6780.CrossRefGoogle Scholar
Liou, J.G., Tsujimori, T., Yang, J., Zhang, R.Y. and Ernst, W.G. (2014) Recycling of crustal materials through study of ultrahigh-pressure minerals in collisional orogens, ophiolites, and mantle xenoliths: A review. Journal of Asian Earth Sciences, 96, 386420.CrossRefGoogle Scholar
Liu, F.L. and Liou, J.G. (2011) Zircon as the best mineral for P–T–time history of UHP metamorphism: a review on mineral inclusions and U–Pb SHRIMP ages of zircons from the Dabie–Sulu UHP rocks. Journal of Asian Earth Sciences, 40, 139.CrossRefGoogle Scholar
Marsellos, A.E. and Garver, J.I. (2010) Radiation damage and uranium concentration in zircon as assessed by Raman spectroscopy and neutron irradiation. American Mineralogist, 95, 11921201.CrossRefGoogle Scholar
Mikhno, A.O. and Korsakov, A.V. (2013) K2O prograde zoning pattern in clinopyroxene from the Kokchetav diamond-grade metamorphic rocks: Missing part of metamorphic history and location of second critical end point for calc-silicate system. Gondwana Research, 23, 920930.CrossRefGoogle Scholar
Mikhno, A.O. and Korsakov, A.V. (2015) Carbonate, silicate, and sulfide melts: heterogeneity of the UHP mineral-forming media in calc-silicate rocks from the Kokchetav massif. Russian Geology and Geophysics, 56, 8199.CrossRefGoogle Scholar
Mosenfelder, J.L., Schertl, H.-P., Smyth, J.R. and Liou, J.G. (2005) Factors in the preservation of coesite: The importance of fluid infiltration. American Mineralogist, 90, 779789.CrossRefGoogle Scholar
Murakami, T., Chakoumakos, B.C. and Ewing, R.C. (1986) X-ray powder diffraction analysis of alpha-event radiation damage in zircon(ZrSiO4). Pp. 745753 in: Advances in Ceramics: Nuclear Waste Management II (Clark, D.E., White, W.B. and Machiels, J., editors). American Ceramic Society, Columbus, Ohio.Google Scholar
Nasdala, L., Irmer, G. and Wolf, D. (1995) The degree of metamictization in zircons: a Raman spectroscopic study. European Journal of Mineralogy, 7, 471478.CrossRefGoogle Scholar
Nasdala, L., Wenzel, M., Vavra, G., Irmer, G., Wenzel, T. and Kober, B. (2001) Metamictisation of natural zircon: accumulation versus thermal annealing of radioactivity-induced damage. Contributions to Mineralogy and Petrology, 141, 125144.CrossRefGoogle Scholar
Nasdala, L., Lengauer, C.L., Hanchar, J.M., Kronz, A., Wirth, R., Blanc, P., Kennedy, A.K. and Seydoux-Guillaume, A.-M. (2002) Annealing radiation damage and the recovery of cathodoluminescence. Chemical Geology, 191, 121140.CrossRefGoogle Scholar
Nasdala, L., Kronz, A., Hanchar, J.M., Tichomirowa, M., Davis, D.W. and Hofmeister, W. (2006) Effects of natural radiation damage on back-scattered electron images of single crystals of minerals. American Mineralogist, 91, 17391746.CrossRefGoogle Scholar
Ogasawara, Y., Fukasawa, K. and Maruyama, S. (2002) Coesite exsolution from supersilicic titanite in UHP marble from the Kokchetav Massif, northern Kazakhstan. American Mineralogist, 87, 454461.CrossRefGoogle Scholar
Orwa, J.O., Nugent, K.W., Jamieson, D.N. and Prawer, S. (2000) Raman investigation of damage caused by deep ion implantation in diamond. Physical Review B, 62, 5461.CrossRefGoogle Scholar
Ota, T., Terabayashi, M., Parkinson, C.D. and Masago, H. (2000) Thermobaric structure of the Kokchetav ultrahigh-pressure–high-pressure massif deduced from a north–south transect in the Kulet and Saldat–Kol regions, northern Kazakhstan. Island Arc, 9, 328357.CrossRefGoogle Scholar
Palenik, C.S., Nasdala, L. and Ewing, R.C. (2003) Radiation damage in zircon. American Mineralogist, 88, 770781.CrossRefGoogle Scholar
Parkinson, C.D. (2000) Coesite inclusions and prograde compositional zonation of garnet in whiteschist of the HP-UHPM Kokchetav massif, Kazakhstan: a record of progressive UHP metamorphism. Lithos, 52, 215233.CrossRefGoogle Scholar
Parkinson, C.D. and Katayama, I. (1999) Present-day ultrahigh-pressure conditions of coesite inclusions in zircon and garnet: Evidence from laser Raman microspectroscopy. Geology, 27, 979982.2.3.CO;2>CrossRefGoogle Scholar
Perchuk, L.L., Safonov, O.G., Yapaskurt, V.O. and Barton, J.M. Jr (2002) Crystal-melt equilibria involving potassium-bearing clinopyroxene as indicator of mantle-derived ultrahigh-potassic liquids: an analytical review. Lithos, 60, 89111.CrossRefGoogle Scholar
Perraki, M., Korsakov, A.V., Smith, D.C. and Mposkos, E. (2009) Raman spectroscopic and microscopic criteria for the distinction of microdiamonds in ultrahigh-pressure metamorphic rocks from diamonds in sample preparation materials. American Mineralogist, 94, 546556.CrossRefGoogle Scholar
Rubatto, D. and Hermann, J. (2007) Zircon behaviour in deeply subducted rocks. Elements, 3, 3135.CrossRefGoogle Scholar
Rubatto, D., Liati, A. and Gebauer, D. (2003) Dating UHP metamorphism. Pp. 341–363 in: EMU Notes in Mineralogy, Vol. 5.CrossRefGoogle Scholar
Schaltegger, U., Fanning, C.M., Günther, D., Maurin, J.C., Schulmann, K. and Gebauer, D. (1999) Growth, annealing and recrystallization of zircon and preservation of monazite in high-grade metamorphism: conventional and in-situ U-Pb isotope, cathodoluminescence and microchemical evidence. Contributions to Mineralogy and Petrology, 134, 186201.CrossRefGoogle Scholar
Schertl, H.-P. and Sobolev, N.V. (2013) The Kokchetav Massif, Kazakhstan:“Type locality” of diamond-bearing UHP metamorphic rocks. Journal of Asian Earth Sciences, 63, 538.CrossRefGoogle Scholar
Shatsky, V.S., Sobolev, N.V., Zayachkovsky, A.A., Zorin, T.Y. and Vavilov, M.A. (1991) New occurrence of microdiamonds in metamorphic rocks as a proof of regional character of ultrahigh pressure metamorphism in Kokchetav massif. Doklady Akademii Nauk SSSR, 321, 193198.Google Scholar
Shatsky, V.S., Theunissen, K., Dobretsov, N.L. and Sobolev, N.V. (1998) New indications of ultrahigh-pressure metamorphism in the mica schists of the Kulet site of the Kokchetav Massif (north Kazakhstan). Russian Geology and Geophysica, 39, 10411046.Google Scholar
Shatsky, V.S., Jagoutz, E., Sobolev, N.V., Kozmenko, O.A., Parkhomenko, V.S. and Troesch, M. (1999) Geochemistry and age of ultrahigh pressure metamorphic rocks from the Kokchetav massif (Northern Kazakhstan). Contributions to Mineralogy and Petrology, 137, 185205.CrossRefGoogle Scholar
Shatsky, V.S., Skuzovatov, S.Y., Ragozin, A.L. and Sobolev, N.V. (2015) Mobility of elements in a continental subduction zone: evidence from the UHP metamorphic complex of the Kokchetav massif. Russian Geology and Geophysics, 56, 10161034.CrossRefGoogle Scholar
Shchepetova, O.V., Korsakov, A.V., Mikhailenko, D.S., Zelenovskiy, P.S., Shur, V.Y. and Ohfuji, H. (2017) Forbidden mineral assemblage coesite-disordered graphite in diamond-bearing kyanite gneisses (Kokchetav Massif). Journal of Raman Spectroscopy, 48, 16061612.CrossRefGoogle Scholar
Shimizu, N. (1971) Potassium contents of synthetic clinopyroxenes at high pressures and temperatures. Earth and Planetary Science Letters, 11, 374380.CrossRefGoogle Scholar
Shimizu, R. and Ogasawara, Y. (2014) Radiation damage to Kokchetav UHPM diamonds in zircon: Variations in Raman, photoluminescence, and cathodoluminescence spectra. Lithos, 206, 201213.CrossRefGoogle Scholar
Sobolev, N.V. (1994) Zircon from ultrahigh pressure metamorphic rocks of folded regions as an unique container of inclusions of diamond, coesite and coexisting minerals. Doklady Akademii Nauk, 334, 488492.Google Scholar
Sobolev, N.V. and Shatsky, V.S. (1990) Diamond inclusions in garnets from metamorphic rocks: a new environment for diamond formation. Nature, 343, 742.CrossRefGoogle Scholar
Sobolev, N.V., Shatsky, V.S., Vavilov, M.A. and Goryainov, S.V. (1991) Coesite inclusion in zircon from diamondiferous gneiss of Kokchetav massif-first find of coesite in metamorphic rocks in the USSR territory. Doklady Akademii Nauk SSSR, 321, 184188.Google Scholar
Steger, S., Nasdala, L. and Wagner, A. (2013) Raman spectra of diamond abrasives and possible artefacts in detecting UHP microdiamond. CORALS–2013 (Conference on Raman and Luminescence Spectroscopy in the Earth Sciences), Vienna, Austria, pp. 9596.Google Scholar
Stepanov, A.S., Hermann, J., Rubatto, D., Korsakov, A.V. and Danyushevsky, L.V. (2016a) Melting history of an ultrahigh-pressure paragneiss revealed by multiphase solid inclusions in garnet, Kokchetav massif, Kazakhstan. Journal of Petrology, 57, 15311554.Google Scholar
Stepanov, A.S., Rubatto, D., Hermann, J. and Korsakov, A.V. (2016b) Contrasting PT paths within the Barchi-Kol UHP terrain (Kokchetav Complex): Implications for subduction and exhumation of continental crust. American Mineralogist, 101, 788807.CrossRefGoogle Scholar
Tailby, N.D., Walker, A.M., Berry, A.J., Hermann, J., Evans, K.A., Mavrogenes, J.A., O'Neill, H.S.C., Rodina, I.S., Soldatov, A.V. and Rubatto, D. (2011) Ti site occupancy in zircon. Geochimica et Cosmochimica Acta, 75, 905921.CrossRefGoogle Scholar
Theunissen, K., Dobretsov, N.L., Korsakov, A.V., Travin, A.V., Shatsky, V.S., Smirnova, L.V. and Boven, A. (2000) Two contrasting petrotectonic domains in the Kokchetav megamelange (north Kazakhstan): difference in exhumation mechanisms of ultrahigh-pressure crustal rocks, or a result of subsequent deformation? Island Arc, 9, 284303.CrossRefGoogle Scholar
Tomkins, H.S., Powell, R. and Ellis, D.J. (2007) The pressure dependence of the zirconium-in-rutile thermometer. Journal of Metamorphic Geology, 25, 703713.CrossRefGoogle Scholar
Vavra, G. (1990) On the kinematics of zircon growth and its petrogenetic significance: a cathodoluminescence study. Contributions to Mineralogy and Petrology, 106, 9099.CrossRefGoogle Scholar
Watson, E.B., Wark, D.A. and Thomas, J.B. (2006) Crystallization thermometers for zircon and rutile. Contributions to Mineralogy and Petrology, 151, 413.CrossRefGoogle Scholar
Weber, W.J., Ewing, R.C. and Meldrum, A. (1997) The kinetics of alpha-decay-induced amorphization in zircon and apatite containing weapons-grade plutonium or other actinides. Journal of Nuclear Materials, 250, 147155.CrossRefGoogle Scholar
Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185187.CrossRefGoogle Scholar
Woodhead, J.A., Rossman, G.R. and Silver, L.T. (1991) The metamictization of zircon: Radiation dose-dependent structural characteristics. American Mineralogist, 76, 7482.Google Scholar
Wu, Y. and Zheng, Y. (2004) Genesis of zircon and its constraints on interpretation of U-Pb age. Chinese Science Bulletin, 49, 15541569.CrossRefGoogle Scholar
Zamyatin, D.A., Shchapova, Y.V., Votyakov, S.L., Nasdala, L. and Lenz, C. (2017) Alteration and chemical U-Th-total Pb dating of heterogeneous high-uranium zircon from a pegmatite from the Aduiskii Massif, Middle Urals, Russia. Mineralogy and Petrology, 111, 475497.CrossRefGoogle Scholar
Zamyatin, D.A., Votyakov, S.L. and Shchapova, Y.V. (2019) JPD-analysis as a new approach for studying the zircon texture with micron spatial resolution with application to geochronology. Doklady Earth Sciences, 485, 376380.CrossRefGoogle Scholar
Zhang, M. and Salje, E.K.H. (2001) Infrared spectroscopic analysis of zircon: Radiation damage and the metamict state. Journal of Physics: Condensed Matter, 13, 3057.Google Scholar
Zhang, M., Salje, E.K.H., Ewing, R.C., Farnan, I., Ríos, S., Schlüter, J. and Leggo, P. (2000) Alpha-decay damage and recrystallization in zircon: evidence for an intermediate state from infrared spectroscopy. Journal of Physics: Condensed Matter, 12, 5189.Google Scholar
Zhang, R.Y., Liou, J.G., Ernst, W.G., Coleman, R.G., Sobolev, N.V. and Shatsky, V.S. (1997) Metamorphic evolution of diamond-bearing and associated rocks from the Kokchetav Massif, northern Kazakhstan. Journal of Metamorphic Geology, 15, 479496.CrossRefGoogle Scholar