Dakalasu (No. 1 pegmatite)
Xinjiang, Chinese Altay, China
Magmatic (Ni-Cu-PGE, carbonatites)Be-Nb-Ta
- Type
- Zoned Be-Nb-Ta granitic pegmatite
Zoned pegmatite dyke (up to 200 m long, 1.5 to 20 m thick) intruding the Dakalasu biotite granite porphyry (zircon 248 to 261 Ma); 280 t BeO and 95 t (Ta + Nb)2O5 at 0.05 % BeO and 0.02 % (Ta + Nb)2O5, beryl and columbite-tantalite. Intermediate zone dated at 228 to 229 Ma. Xia et al. (2025): tourmaline from -15.84 to -14.55 ‰, pegmatite derived from low-degree partial melting of metasediments.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −14.82 ± 0.14 ‰ | −15.05 / −14.55 ‰ | 8 | massive tourmaline of border zone I, at the contact with the granite porphyry (Tur BI) Mean and standard deviation recalculated from 8 analyses, -15.05 to -14.55 (112HSB-1 -14.76; 112HSB-2 -14.84; 112HSB-3 -14.82; 112HSB-4 -15.05; 112HSB-5 -14.84; 112HSB-6 -14.88; 112HSB-7 -14.83; 112HSB-8 -14.55). | Xia et al. (2025), Petrogenesis and evolution of internally zoned pegmatites: A tourmalin… |
| −15.66 ± 0.13 ‰ | −15.84 / −15.43 ‰ | 8 | fine-grained tourmaline of border zone II (Tur BII) Mean and standard deviation recalculated from 8 analyses, -15.84 to -15.43 (61HSB-1 -15.84; 61HSB-2 -15.55; 61HSB-3 -15.75; 61HSB-4 -15.70; 61HSB-5 -15.77; 61HSB-6 -15.62; 61HSB-7 -15.61; 61HSB-8 -15.43). | Xia et al. (2025), Petrogenesis and evolution of internally zoned pegmatites: A tourmalin… |
| −15.28 ± 0.24 ‰ | −15.54 / −14.86 ‰ | 8 | tourmaline of the intermediate zone, with beryl (Tur IM) Mean and standard deviation recalculated from 8 analyses, -15.54 to -14.86 (82HSB-1 -15.54; 82HSB-2 -15.40; 82HSB-3 -15.02; 82HSB-4 -14.86; 82HSB-5 -15.54; 82HSB-6 -15.35; 82HSB-7 -15.22; 82HSB-8 -15.34). | Xia et al. (2025), Petrogenesis and evolution of internally zoned pegmatites: A tourmalin… |
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). Dakalasu (No. 1 pegmatite), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/dakalasu-pegmatite-n-1/ (accessed 2026-10-20).
@misc{isofind2026dakalasuno1pegmatiteisotopesi,
title = {Dakalasu (No. 1 pegmatite), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/dakalasu-pegmatite-n-1/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20