Soil profile with interbedded mine tailings at the foot of the Lanmuchang mining area
Guizhou, Lanmuchang, China
Soils
- Type
- Soil
Vertical profile of at least 220 cm at the foot of the former Hg-Tl mine, with tailings interbedded at about 40-80 cm and 100-120 cm; pH 3.67; Tl from 48.68 to 375.21 mg/kg (peak at 60 cm), correlated with As (r = 0.87), S, Fe and Mn; Tl mostly residual (60 %) and reducible (32.9 %), held by illite and birnessite particles. No binary mixing line (R² = 0.006); a three end-member model assigns on average 51.99 % of Tl to tailings, 42.47 % to lorandite and 5.54 % to the host rock; a few overly heavy horizons (A9, A19, A22) suggest fractionation, possibly microbial (Yuan et al., 2024). Indicative coordinates of the deposit: profile location shown only on a map.
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.56 / 2.41 ε | whole profile (soils and tailings layers) Published range, -0.56 ± 0.24 to +2.41 ± 0.35; individual values only in Fig. 3; no correlation with Tl geochemical fractions, pH or TOC; the heaviest samples have more Tl(III) (XPS). | Yuan et al. (2024), Thallium isotopic fractionation in soils from a historic Hg-Tl mining… | ||
| 1.14 / 1.53 ε | interbedded mine tailings layers (A5 to A7 and A11) Published range, +1.14 ± 0.1 to +1.53 ± 0.35; heavy signature ascribed to fine birnessite particles; tailings end-member of the mixing model, main Tl source of the profile. | Yuan et al. (2024), Thallium isotopic fractionation in soils from a historic Hg-Tl mining… |
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Cite this page
IsoFind Atlas (2026). Soil profile with interbedded mine tailings at the foot of the Lanmuchang mining area, isotope signatures. https://www.isofind.tech/isotopes/en/sites/profil-de-sol-a-residus-miniers-intercales-au-pied-de-la-zone-miniere-de-lanmuchang/ (accessed 2026-10-16).
@misc{isofind2026soilprofilewithinterbeddedmin,
title = {Soil profile with interbedded mine tailings at the foot of the Lanmuchang mining area, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/profil-de-sol-a-residus-miniers-intercales-au-pied-de-la-zone-miniere-de-lanmuchang/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16