Xiaoshanba
Central Guizhou, Xiuwen County (Guiyang), China
OtherAl (Ga)
- Type
- Karst bauxite (coal-bauxite-iron sequence)
Stratiform to lenticular bodies of the Jiujialu Formation (Lower Carboniferous) on Cambrian dolostones of the Loushanguan Group, deposited in a brackish lagoon: ferruginous clay at the base, diaspore bauxite, then carbonaceous claystone; Jiujialu and Wulongsi orebodies. Gallium decouples from aluminium as weathering intensifies: Ga/Al of 2.8 × 10⁻⁴ in kaolinite claystones against 1.5 × 10⁻⁴ in diaspore bauxite, about 0.3 ‰ lighter in 71Ga; supergene reprecipitation of light Ga (Wen et al., 2021). Indicative coordinates (Xiuwen county seat).
δ71Ga in ‰ (per mil) Values of the same system
Standard : NIST SRM 994
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.21 ± 0.14 ‰ | 1.03 / 1.44 ‰ | 8 | kaolinite claystone (Jiujialu and Wulongsi orebodies) Mean and standard deviation recalculated from 8 analyses, samples ZXSB-1 to ZXSB-6, WLS-3 and WLS-4, 40.6 to 61.5 µg/g Ga, Ga/Al of 2.0 to 4.4 × 10⁻⁴; the heaviest of the deposit. | Wen et al. (2021), Gallium isotope fractionation in the Xiaoshanba bauxite deposit, centr… |
| 0.9 ± 0.13 ‰ | 0.65 / 1.1 ‰ | 12 | diaspore bauxite (Jiujialu and Wulongsi orebodies) Mean and standard deviation recalculated from 12 analyses, samples ZXSB-10 to ZXSB-12 and WLS-5 to WLS-12, 30.1 to 46.4 µg/g Ga, Ga/Al of 1.3 to 1.9 × 10⁻⁴; gallium becomes lighter down the profiles. | Wen et al. (2021), Gallium isotope fractionation in the Xiaoshanba bauxite deposit, centr… |
| 1.05 ± 0.16 ‰ | 0.82 / 1.15 ‰ | 4 | bauxitic claystone with diaspore and kaolinite Mean and standard deviation recalculated from 4 analyses, samples ZXSB-7 to ZXSB-9 and WLS-13, intermediate between claystone and bauxite. | Wen et al. (2021), Gallium isotope fractionation in the Xiaoshanba bauxite deposit, centr… |
| 1.22 ± 0.1 ‰ | 1.09 / 1.31 ‰ | 4 | dolostones interbedded in the bauxite sequence (dolostone, aluminous and siliceous dolostone) Mean and standard deviation recalculated from 4 analyses, samples ZXSB-0, ZXSB-3, WLS-0 and WLS-1, 2.2 to 24.2 µg/g Ga, high alteration indices in the aluminous and siliceous layers. | Wen et al. (2021), Gallium isotope fractionation in the Xiaoshanba bauxite deposit, centr… |
Deposits of the same type
- Houcao China
- Datangpo-type manganese (Gaolou, Minle, Zhenxing) China
- Anning (carbonate-hosted clay-type lithium) China
- Deep lithium-bearing brines of the Jiangling Basin China
- Huainan-Huaibei coalfield China
- Lithium-rich salt lakes of the Qaidam Basin (Dongtai, Xitai, Yiliping, Qarhan) China
- Dezong Mahai (Balun Mahai basin clay-type lithium) China
- Kinta Valley Malaisie
Cite this page
IsoFind Atlas (2026). Xiaoshanba, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/xiaoshanba/ (accessed 2026-10-15).
@misc{isofind2026xiaoshanbaisotopesignatures,
title = {Xiaoshanba, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/xiaoshanba/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15