Beijing granite weathering profile
Beijing, Western Hills (quarry on a ridge top), China
Soils
- Type
- Soil
Profile under a temperate semiarid climate (12.2 °C, 539 mm/yr), sparse herbaceous vegetation; weak weathering (CIA 49 to 59). Ga stays mostly in the lattice of Al- then Fe-bearing minerals, little adsorbed; δ71Ga decreases from the parent rock (+0.71 ‰) to the surface and follows the τGa,Th index: dissolution of primary minerals, Δ71Ga(solution-regolith) of about +0.26 ‰ (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 |
|---|---|---|---|---|
| 0.64 ± 0.03 ‰ | 0.61 / 0.68 ‰ | 9 | regolith (bulk) Mean and standard deviation recalculated from 9 analyses, samples ZKD2-1 to ZKD2-9; phase mass balance consistent with the bulk. | Yuan et al. (2025), Gallium isotope fractionation during granite weathering: Insights fro… |
| 0.49 ± 0.08 ‰ | 0.39 / 0.64 ‰ | 8 | Fe-Mn oxyhydroxide phase of the regolith (sequential extraction) Mean and standard deviation recalculated from 8 analyses, samples ZKD2-2 to ZKD2-9; phase lighter than the residue (+0.60 to +0.71 ‰), which carries 70 to 87 % of the Ga. | Yuan et al. (2025), Gallium isotope fractionation during granite weathering: Insights fro… |
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Cite this page
IsoFind Atlas (2026). Beijing granite weathering profile, isotope signatures. https://www.isofind.tech/isotopes/en/sites/profil-d-alteration-sur-granite-de-pekin/ (accessed 2026-10-15).
@misc{isofind2026beijinggraniteweatheringprofi,
title = {Beijing granite weathering profile, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/profil-d-alteration-sur-granite-de-pekin/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15