Koktokay No. 3 (Altay No. 3) pegmatite, Altay Mine, Koktokay (Keketuohai) Pegmatite field, Fuyun Co. (Koktokay Co.), Aletai (Altay) Prefecture, Yili Hasake (Ili Kazakh) Autonomous Prefecture, Xinjiang (Xinjiang-Uygur) Autonomous Region, China

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A highly evolved, rare-element class, LCT-type granitic pegmatite of the spodumene-subtype category. Exploited for pollucite, spodumene, lepidolite, beryl and columbite-tantalite.

The Koktokay No. 3 pegmatite intruded metagabbro. It shows a well-developed internal textural zonation, both in the thin but extensive subhorizontal bottom section, and in the cupola. From the outermost textural zone inward, nine mineralogical-textural zones can be distinguished: (1) graphic pegmatite zone; (2) sugary albite zone; (3) blocky microcline zone; (4) muscovite-quartz zone; (5) cleavelandite-spodumene zone; (6) quartz-spodumene zone; (7) platy albite-muscovite zone; (8) lepidolite-platy albite zone; (9) blocky quartz and microcline core (Wang et al. 1981; Zhu et al. 2000; Wang et al. 2006).

References

- Rubo Zhang (1981): The discovery of gahnite and lithiophilite in Altay pegmatite. Geological Review 27(1), 1-7.
- Rubo Zhang, Fengming Han, and Chongliang Du (1985): Ertixiite - A New Mineral from the Altay Pegmatite Mine, Xinjiang, China. Geochemistry 4(2), 192-195.
- Liangming Fan, Yuyuan Mao, Yongwen Wan, and Shiwei Luan (1994): Discovery of eucryptite and swinefordite in no. 3 pegmatite vein, Keketuohai district, Xinjiang, China. Journal of Mineralogy and Petrology 15(1).
- Huanzhang Lu, Zhonggang Wang, and Yuansheng Li (1997): Magma-Fluid Transition and the Genesis of Pegmatite Dike No.3, Altay, Xinjiang, Northwest China. Chinese Journal of Geochemistry 16(1), 43-52.
- 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(1), 40-52 (in Chinese with English abstract).
- Yan Liu, Yan Gao, Mingyue He, and Keqin Cai (2003): Mineralogical characteristic of Keketuohai cat's eye aquamarine in Xinjiang and its exploration. Geology and Prospecting 39(3), 25-30.
- Zhang, A.C., Wang, R.C., Hu, H., Zhang, H., Zhu, J.C., and Chen, X.M. (2004): Chemical evolution of Nb-Ta oxides and zircon from the Koktokay no. 3 granitic pegmatite, Altai, northwestern China. Mineralogical Magazine 68(5), 739-756.
- Congqiang Liu and Hui Zhang (2005): The lanthanide tetrad effect in apatite from the Altay No. 3 pegmatite, Xingjiang, China: an intrinsic feature of the pegmatite magma. Chemical Geology 214(1/2), 61-77.
- Wang, R.C., Hu, H., Zhang, A.C., Fontan, F., Zhang, H., and de Parseval, P. (2006): Occurrence and late re-equilibration of pollucite from the Koktokay no. 3 pegmatite, Altai, northwestern China. American Mineralogist 91, 729-739.
- Wang, R.C., Hu, H., Zhang, A.C., Fontan, F., de Parseval, P., and Jiang, S.Y. (2007): Cs-dominant polylithionite in the Koktokay #3 pegmatite, Altai, NW China: in situ micro-characterization and implication for the storage of radioactive cesium. Contributions to Mineralogy and Petrology 153, 355-367.
- Tao Wang, Ying Tong, Borming Jahn, Tianren Zou, Yanbin Wang, Dawei Hong, and Baofu Han (2007): SHRIMP U–Pb Zircon geochronology of the Altai No. 3 Pegmatite, NW China, and its implications for the origin and tectonic setting of the pegmatite. Ore Geology Reviews 32, 325-336.
- Aicheng Zhang, Rucheng Wang, Yiliang Li, Huan Hu, Xiancai Lu, Junfeng Ji, and Hui Zhang (2008): Tourmalines from the Koktokay No.3 pegmatite, Altai, NW China: spectroscopic characterization and relationships with the pegmatite evolution. European Journal of Mineralogy 20, 143-154.
- Haihong Ding, Huan Hu, Aicheng Zhang, Pei Ni, and Shijin Xu (2010): Study on Metamict Zircon from the Koktokay No. 3 Granitic Pegmatite Vein. Acta Mineralogica Sinica 30(2), 160-167.

External Links

http://es.nju.edu.cn/Upload/Zhang_EJM%282008%29.pdf

Mineral List

Albite var: Cleavelandite 'Apatite' Ashanite Beryl var: Aquamarine Brabantite Columbite-(Mn) Elbaite Epidote Ertixiite (TL) Eucryptite

Fluorite Foitite Gahnite 'Garnet' Lepidolite var: Purple Jade Lithiophilite Microcline var: Amazonite Microlite Group var: Uranmicrolite (of Hogarth 1977) Molybdenite 'Monazite'

Montebrasite Muscovite Petalite Pollucite Polylithionite var: Cs-bearing Polylithionite Pyrite Quartz Rossmanite Spessartine Sphalerite Spodumene

Staurolite Swinefordite Tantalite-(Mn) Tapiolite-(Fe) Topaz Trilithionite UM2004-49-SiO:AlCsFHKLi Zircon var: Hafnian Zircon

45 entries listed. 32 valid minerals. 1 type locality (valid mineral).