Western Guangdong granite weathering profile
Southwestern Guangdong, about 70 km from the coast (roadcut on a ridge top), China
Soils
- Type
- Soil
Profile under a tropical monsoon climate (23.5 °C, 1691 mm/yr), eucalyptus cover; intense weathering (CIA 88 to 96). δ71Ga goes from +0.70 ‰ in the granite to a minimum of +0.54 ‰ in the regolith without following the τGa,Ta index: adsorption and coprecipitation on Fe oxides and secondary Al-silicates add to dissolution, hence a smaller Δ71Ga(solution-regolith) of about +0.11 ‰ (Yuan et al., 2025). Published coordinates.
δ71Ga in ‰ (per mil) Values of the same system
Standard : NIST SRM 994
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.61 ± 0.02 ‰ | 0.54 / 0.64 ‰ | 35 | regolith (bulk) Mean and standard deviation recalculated from 35 analyses, samples ZJ2-1 to ZJ2-35; minimum of +0.54 ‰ (ZJ2-25), extraction residues at +0.61 and +0.62 ‰. | Yuan et al. (2025), Gallium isotope fractionation during granite weathering: Insights fro… |
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Cite this page
IsoFind Atlas (2026). Western Guangdong granite weathering profile, isotope signatures. https://www.isofind.tech/isotopes/en/sites/profil-d-alteration-sur-granite-du-guangdong-occidental/ (accessed 2026-10-15).
@misc{isofind2026westernguangdonggraniteweathe,
title = {Western Guangdong granite weathering profile, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/profil-d-alteration-sur-granite-du-guangdong-occidental/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15