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Chemical evolution of Nb-Ta oxides and zircon from the Koktokay No. 3 granitic pegmatite, Altai, northwestern China

Published online by Cambridge University Press:  05 July 2018

A. C. Zhang ,
R. C. Wang ,
H. Hu ,
H. Zhang ,
J. C. Zhu  and
X. M. Chen
A. C. Zhang
Affiliation:
State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences, Nanjing University, Nanjing 210093, China
R. C. Wang*
Affiliation:
State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences, Nanjing University, Nanjing 210093, China
H. Hu
Affiliation:
State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences, Nanjing University, Nanjing 210093, China
H. Zhang
Affiliation:
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
J. C. Zhu
Affiliation:
State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences, Nanjing University, Nanjing 210093, China
X. M. Chen
Affiliation:
State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences, Nanjing University, Nanjing 210093, China
*
*E-mail: rcwang@nju.edu.cn
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Abstract

The Koktokay No. 3 granitic pegmatite, Altai, northwestern China, is a strongly zoned rare-element granitic pegmatite, where the petrographic zones were distinguished into two groups: outer zones (I to IV) and inner zones (V to IX). Nb-Ta oxides and zircon are investigated in this paper by using quantitative electron-microprobe analyses (EMPA) and backscattered-electron (BSE) imaging. Columbite-tantalite and zircon occur in most textural zones, whereas tapiolite and uranmicrolite are mainly restricted to zone VII. Manganocolumbite and zircon from the outer zones (zones II and IV) are homogeneous except for a few exceptions, whereas manganotantalite and hafnian zircon from the inner zones (V–VII) are obviously heterogeneous and strongly zoned. Chemically, Ta/(Nb+Ta) in columbite-tantalite and Hf/(Zr+Hf) in zircon increase from the outer to the inner zones on one hand, and from core to rim in single zoned crystals on the other hand. Observations of intra-zonal variations of the chemical composition of Nb-Ta oxides and zircon in the Koktokay No. 3 granitic pegmatite may suggest that the outer zones crystallize under magmatic conditions, whereas the inner zones crystallize under fluid-rich magmatic conditions, and locally under hydrothermal conditions. The extreme enrichments of columbite-tantalite in Ta, and of zircon in Hf, as well as the occurrence of uranmicrolite and tapiolite, indicate an elevated evolution of the Koktokay No. 3 granitic pegmatite.

Keywords

columbite-tantalitetapioliteuranmicrolitezircongranitic pegmatiteKoktokayAltaiChina
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 5 , October 2004 , pp. 739 - 756
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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References

Aurisicchio, C., De Vito, C., Ferrini, V. and Orlandi, P. (2002) Nb and Ta oxide minerals in the Fonte Del Prete granitic pegmatite dyke, Island of Elba, Italy. The Canadian Mineralogist, 40, 799–814.CrossRefGoogle Scholar
Bau, M. (1996) Controls on the fractionation of isovalent trace elements in magmatic and aqueous systems: evidence from Y/Ho, Zr/Hf, and lathanide tetrad effect. Contributions to Mineralogy and Petrology, 123, 323–333.CrossRefGoogle Scholar
Černý, P. and Ercit, T.S. (1989) Mineralogy of niobium and tantalum: crystal chemical relationships, paragenetic aspects and the economic implications. Pp. 27–79 in: Lanthanides Tantalum and Niobium (Moller, P., Černý, P. and Saupe, F., editors). Springer, Berlin, Heidelberg, New York, Tokyo.CrossRefGoogle Scholar
Černý, P. and Siivola, J. (1980) The Tanco pegmatite at Bernic Lake, Manitoba XII. Hafnian zircon. The Canadian Mineralogist, 18, 313–321.Google Scholar
Černý, P., Meintzer, R.E. and Anderson, A.J. (1985) Extreme fractionation in rare-element granitic pegmatites: selected examples of data of mechanisms. The Canadian Mineralogist, 23, 381–421.Google Scholar
Černý, P., Goad, B.E., Hawthorne, F.C. and Chapman, R. (1986) Fractionation trends of the Nb- and Ta- bearing oxide minerals in the Greer Lake pegmatitic granite and its pegmatite aureole, Southeastern Manitoba. American Mineralogist, 71, 501–517.Google Scholar
Černý, P., Chapman, R., Chackowsky, L.E. and Ercit, T.S. (1989 a) A ferrotantalite-ferrotapiolite intergrowth from Spittal a.d. Drau, Carinthis, Austria. Mineralogy and Petrology, 41, 53–63.CrossRefGoogle Scholar
Černý, P., Ucakuwun, E.K. and Chapman, R. (1989 b) A ferrotantalite-ferrotapiolite exsolution from Uganda. Neues Jahrbuch für Mineralogie, Monatshefte, 109–120.Google Scholar
Černý, P., Novak, M. and Chapman, R. (1992) Effects of sillimanite-grade metamorphism and shearing on Nb-Ta oxide minerals in granitic pegmatites: Marsikov, Northern Moravia, Czechoslovakia. The Canadian Mineralogist, 30, 699–718.Google Scholar
Chen, F.W., Li, H.Q., Wang, D.H., Cai, H. and Chen, W. (2000) New chronological evidence for Yanshanian diagenetic mineralization in China's Altay orogenic belt. Chinese Science Bulletin, 45, 108–114.CrossRefGoogle Scholar
Correia Neves, J.M., Lopes Nunes, J.E. and Sahama, T.G. (1974) High hafnium members of the zircon-hafnon series from the granite pegmatites of Zambézia, Mozambique. Contributions to Mineralogy and Petrology, 48, 73–80.CrossRefGoogle Scholar
Huang, X.L., Wang, R.C., Chen, X.M., Hu, H. and Liu, C.S. (2002) Vertical variations in the mineralogy of the Yichun topaz-lepidolite granite, Jiangxi province, Southern China. The Canadian Mineralogist, 40, 1047–1068.CrossRefGoogle Scholar
Kempe, U., Gruner, T., Renno, A.D. and Wolf, D. (1997) Hf-rich zircons in rare-metal bearing granites: Magmatic or metasomatic origin. Pp. 643–46 in: Mineral Deposits: Researchand Exploration. Where do they Meet? (Papunen, H., editor). Balkema, Rotterdam.Google Scholar
Kempe, U., Götze, J., Dandar, S. and Habermann, D. (1999) Magmatic and metasomatic processes during formationof the Nb-Zr-REE deposits Khaldzam Buregte and Tsakhir (Mongolian Altai): Indications from a combined CL-SEM study. Mineralogical Magazine, 63, 165–177.CrossRefGoogle Scholar
Kempe, U., Gruner, T., Renno, A.D., Wolf, D. and Rene, M. (2004) Discussion on Wang et al . (2000) ‘Chemistry of Hf-rich zircons from the Laoshan I- and A-type granites, Eastern China’, Mineralogical Magazine, 64, 867–77. Mineralogical Magazine, 68, 669–675.Google Scholar
Keppler, P. (1993) Influence of fluorine on the enrichment of high field strength trace elements in granitic rocks. Contributions to Mineralogy and Petrology, 114, 479–488.CrossRefGoogle Scholar
Lahti, S.I. (1987) Zoning in columbite-tantalite crystals from the granitic pegmatites of the Erajarvi area, southern Finland. Geochimica et Cosmochimica Acta, 51, 509–517.CrossRefGoogle Scholar
Linnen, R.L. (1998) The solubility of Nb-Ta-Zr-Hf-W in granitic melts with Li and Li+F: constraints for mineralization in rare metal granites and pegmatites. Economic Geology, 93, 1013–1025.CrossRefGoogle Scholar
Linnen, R.L. and Keppler, H. (1997) Columbite solubility in granitic melts: consequences for the enrichment and fractionation of Nb and Ta in the Earth's crust. Contributions to Mineralogy and Petrology, 128, 213–227.CrossRefGoogle Scholar
Linnen, R.L. and Keppler, H. (2002) Melt composition control of Zr/Hf fractionation in magmatic processes. Geochimica et Cosmochimica Acta, 66, 3293–3301.CrossRefGoogle Scholar
London, D. (1996) Granitic pegmatites. Transactions of the Royal Society of Edinburgh: Earth Sciences, 87, 305–319.CrossRefGoogle Scholar
Mulja, T., Williams-Jones, A.E., Martin, R.F. and Wood, S.A. (1996) Compositional variation and structural state of columbite-tantalite in rare-element granitic pegmatites of the Preissac-Lacorne batholith, Quebec, Canada. American Mineralogist, 81, 146–157.CrossRefGoogle Scholar
Norton, D.L. and Dutrow, B.L. (2001) Complex behavior of magma-hydrothermal processes: Role of supercritical fluid. Geochimica et Cosmochimica Acta, 65, 4009–4017.CrossRefGoogle Scholar
Novák, M. and Černý, P. (1998) Niobium-tantalum oxide minerals from complex granitic pegmatites in the Moldanubicum, Czech Republic: Primary versus secondary compositional trends. The Canadian Mineralogist, 36, 659–672.Google Scholar
Novák, M. and Černý, P. (2001) Distinctive compositional trends in columbite-tantalite from two segments of the lepidolite pegmatite at Rožná, western Moravia, Czech Republic. Journal of the Czech Geological Society, 46, 1–8.Google Scholar
Novák, M., Černý, P. and Uher, P. (2003) Extreme variation and apparent reversal of Nb-Ta fractionation in columbite-group minerals from the Scheibengraben beryl-columbite granitic pegmatite, Marsikov, Czech Republic. European Journal of Mineralogy, 15, 565–574.CrossRefGoogle Scholar
Renno, A. (1997) Zur Petrogenese der Albitgranite von Abu Dabbab und Nuweibi, Central Eastern Desret, Ägypten. PhD thesis, TU Berlin, 138 pp.Google Scholar
Sarbajna, C., Krishnamurthy, P., Paul, A.K. and Banerjee, D.C. (2000) Mineralogical and chemical characteristics of complexly-zoned columbite-tantalite from the rare metal pegmatites of southern Karnataka. Journal of the Geological Society of India, 56, 557–571.Google Scholar
Shore, M. and Fowler, A.D. (1996) Oscillatory zoning in minerals: a common phenomenon. The Canadian Mineralogist, 34, 1111–1126.Google Scholar
Tindle, A.G. and Breaks, F.W. (1998) Oxide minerals of the Separation Rapids rare-element granitic pegmatite group, Northwestern Ontario. The Canadian Mineralogist, 36, 609–635.Google Scholar
Tindle, A.G. and Breaks, F.W. (2000) Columbite-tantalite mineral chemistry from rare-element granitic pegmatites: Separation Lake area, N.W. Ontario, Canada. Mineralogy and Petrology, 70, 165–198.CrossRefGoogle Scholar
Wang, R.C., Fontan, F., Xu, S.J., Chen, X.M. and Monchoux, P. (1996) Hafnian zircon from the apical part of the Suzhou granite, China. The Canadian Mineralogist, 34, 1001–1010.Google Scholar
Wang, R.C., Fontan, F., Xu, S.J., Chen, X.M. and Monchoux, P. (1997) The association of columbite, tantalite and tapiolite in the Suzhou granite, China. The Canadian Mineralogist, 35, 699–706.Google Scholar
Wang, R.C., Zhao, G.T., Lu, J.J., Chen, X.M., Xu, S.J. and Wang, D.Z. (2000) Chemistry of Hf-rich zircons from the Laoshan I- and A-type granites, Eastern China. Mineralogical Magazine, 64, 867–877.CrossRefGoogle Scholar
Wang, X.J., Zou, T.R., Xu, J.G., Yu, X.Y. and Qiu, Y.Z. (1981) Study of pegmatite minerals of the Altai region. Science Publishing House, Beijing, 140 pp. (in Chinese).Google Scholar
Wang, X.J., Niu, H.C. and Guo, G.Z. (1998) The tracking study of Nb and Ta in magmatic evolutionary process for pegmatite vein No. 3, Altay, China. Geochimica, 27, 1–11 (in Chin ese with English abstract).Google Scholar
Zhu, J.C., Wu, C.N., Liu, C.S., Li, F.C., Huang, X.L. and Zhou, D.S. (2000) Magmatic-hydrothermal evolution and genesis of Koktokay No. 3, rare metal pegmatite dyke, Altai, China. Geological Journal of China Universities, 6, 40–52 (in Chinese with English abstract).Google Scholar