...Rong Yin; Ru Cheng Wang; Ai-Cheng Zhang; Huan Hu; Jin Chu Zhu; Can Rao; Hui Zhang Abstract The Koktokay No. 1 pegmatite in northwestern China is a highly fractionated Li-Cs-Ta (LCT) - type granitic pegmatite. As main Nb - Ta oxides in this pegmatite, columbite-group minerals (CGMs) not only display...

... of Nb-Ta oxides and zircon from the Koktokay No. 3 granitic pegmatite, Altai, northwestern China . Mineralogical Magazine , 68 , 739 – 756 . Zhang A.C. Wang R.C. Jiang S.Y. Hu H. Zhang H. ( 2008a ) Chemical and textural features of tourmaline from the spodumene-subtype...

... is between zones IV and V, and the upper part intrudes upward into the outer zones (zone I–IV) of the cupola and the metagabbro ( Fig. 2a ). Table 1. Occurrences and components for nine internal zones of the Koktokay No. 3 pegmatite, Altai, NW China (Wang et al , 1981; Zhang, 2004a; Zou & Li...

...Rong Yin; Ru Cheng Wang; Ai-Cheng Zhang; Huan Hu; Jin Chu Zhu; Can Rao; Hui Zhang Abstract The Koktokay No. 1 pegmatite is a Li–Cs–Ta-rich granitic pegmatite located in Altai, northwestern China. Zircon is present in most textural zones of this pegmatite and in its contact zone with surrounding...

...Ru Cheng Wang; Xu Dong Che; Wen Lan Zhang; Ai Cheng Zhang; Hui Zhang Abstract Geochemical variations of Na- and Cs-rich beryl were studied in the Koktokay #3 pegmatite, Altai district, China. Complex internal textures in individual crystals characterize two groups of beryl (primary and secondary...

...Ai Cheng Zhang; Ru Cheng Wang; Shao Yong Jiang; Huan Hu; Hui Zhang Abstract The Koktokay No. 3 pegmatite, Altai, northwestern China, is a spodumene-subtype granitic pegmatite. In this study, we report textural and chemical features of tourmaline from the altered country-rock, the contact zone...

... the Koktokay No.3 pegmatite China The structural formulae of tourmaline were calculated based on 31 anions (O, OH, and F), assuming stoichiometric amounts of H 2 O (as OH), i.e., OH + F = 4 atoms per formula unit ( apfu ), B 2 O 3 (3 apfu B) and Li 2 O (as Li + ). The amount of Li assigned to the Y...

...Ru Cheng Wang; Huan Hu; Ai Cheng Zhang; François Fontan; Hui Zhang; Philippe de Parseval Abstract The Koktokay no. 3 pegmatite, Altai, NW China, is a strongly zoned spodumene-subtype pegmatite. Pollucite is the unique ore mineral exploited for Cs in this pegmatite. It occurs in internal textural...

...A. C. Zhang; R. C. Wang; H. Hu; H. Zhang; J. C. Zhu; X. M. Chen 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...

...Ai Cheng Zhang; Ru Cheng Wang; Huan Hu; Xiao Ming Chen; Hui Zhang Abstract Two species of X -site-vacant tourmalines, foitite and rossmanite, occur in the Koktokay No. 3 granitic pegmatite dyke, Altai, northwestern China, a spodumene-subtype pegmatite. Foitite–schorl crystals develop as fillings...

.... (2022) Newly-recognized Triassic highly fractionated leucogranite in the Koktokay deposit (Altai, China): Rare-metal fertility and connection with the No. 3 pegmatite . Gondwana Research 112 , 24 – 51 . Shen, X.M., Zhang, H.X., Wang, Q., Wyman, D.A., & Yang...

... ) and abundant rare metal–related pegmatites ( Che et al., 2015 ; Lv et al., 2012 , 2018 ; Zhang et al., 2016 ; Zhou et al., 2018 ). The Koktokay No. 3 pegmatite is located in the Central Altai domain, near the town of Keketuohai in Xinjiang Province, China ( Fig. 1B ). This economically important...