Koktokay
Xinjiang, central Chinese Altay (Fuyun County), China
Magmatic (Ni-Cu-PGE, carbonatites)Li-Be-Nb-Ta-Cs
- Type
- Rare-metal granitic pegmatites
Rare-metal pegmatite deposit (no. 3, 3a, 3b, 2, 2a, 2b and 1) in metagabbro and schists of the Habahe Group; the hat-shaped no. 3 pegmatite is zoned into nine concentric units and fertile, nos. 1 and 2b are weakly mineralized. Bai et al. (2023): contamination of the pegmatite melt by the metagabbro (Mg, Ca, Fe) favoured crystallization of tourmaline and rare-metal minerals; boron from melting of Habahe Group clastic sediments.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −13.53 ± 0.2 ‰ | −13.76 / −13.2 ‰ | 10 | tourmaline of tourmaline-mica nests in pegmatite no. 1 (Tur-N) Mean and standard deviation recalculated from 10 analyses, -13.76 to -13.20 (Tur-N b -13.56; Tur-N c -13.68; Tur-N b -13.72; Tur-N c -13.33; Tur-N b -13.62; Tur-N c -13.50; Tur-N b -13.76; Tur-N c -13.20; Tur-N b -13.70; Tur-N c -13.26). Selected values of Table 4. Cores (c) and rims (b); lowest Ca. | Bai et al. (2023), In-situ elemental and boron isotopic variations of tourmaline from the… |
| −12.62 ± 0.22 ‰ | −12.93 / −12.29 ‰ | 10 | comb-textured tourmaline of the contact zone of pegmatite no. 1 (Tur-C1) Mean and standard deviation recalculated from 10 analyses, -12.93 to -12.29 (Tur-C1 -12.52; Tur-C1 -12.46; Tur-C1 -12.66; Tur-C1 -12.87; Tur-C1 -12.78; Tur-C1 -12.29; Tur-C1 -12.76; Tur-C1 -12.35; Tur-C1 -12.58; Tur-C1 -12.93). Selected values of Table 4. | Bai et al. (2023), In-situ elemental and boron isotopic variations of tourmaline from the… |
| −12.95 ± 0.26 ‰ | −13.21 / −12.51 ‰ | 10 | comb-textured tourmaline of the contact zone of pegmatite no. 2b (Tur-C2) Mean and standard deviation recalculated from 10 analyses, -13.21 to -12.51 (Tur-C2 -12.51; Tur-C2 -13.06; Tur-C2 -13.15; Tur-C2 -12.74; Tur-C2 -12.55; Tur-C2 -13.21; Tur-C2 -13.03; Tur-C2 -13.18; Tur-C2 -12.96; Tur-C2 -13.11). Selected values of Table 4. | Bai et al. (2023), In-situ elemental and boron isotopic variations of tourmaline from the… |
| −12.26 ± 0.6 ‰ | −13.16 / −11.63 ‰ | 5 | zoned comb-textured tourmaline of the contact zone of pegmatite no. 3 (Tur-C3) Mean and standard deviation recalculated from 5 analyses, -13.16 to -11.63 (Tur-C3 b -12.51; Tur-C3 c -12.08; Tur-C3 b -11.63; Tur-C3 b -13.16; Tur-C3 c -11.90). Selected values of Table 4. Cores (c) and rims (b); highest Mg and Ca. Proposed by the authors as the initial magma composition of the fertile pegmatite. | Bai et al. (2023), In-situ elemental and boron isotopic variations of tourmaline from the… |
Deposits of the same type
- Bayan Obo China
- Norilsk-Talnakh Russia
- Bushveld, Merensky Reef South Africa
- Bushveld, UG2 chromitite South Africa
- Bushveld, Platreef South Africa
- Sudbury Canada
- Voisey's Bay Canada
- Rössing Namibia
Cite this page
IsoFind Atlas (2026). Koktokay, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/koktokay/ (accessed 2026-10-20).
@misc{isofind2026koktokayisotopesignatures,
title = {Koktokay, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/koktokay/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20