Luchengjiang soil profiles, outside the Lanmuchang mining zone
Guizhou, Lanmuchang (west side of the Huangnijiang), China
Soils
- Type
- Soil
Two vertical profiles near the top of Luchengjiang, outside the Lanmuchang mining zone and tailings: profile A (140 cm, 14 samples, grey-black throughout) and profile B (150 cm, 10 samples, grey-black to 45 cm then yellow and slightly weathered). Tl from 62 to 104 mg/kg (A) and 15 to 139 mg/kg (B), far above the Chinese soil background (0.62 mg/kg), correlated with As (r = 0.92 to 0.99); Tl held by jarosite and hematite, lorandite and Cu-bearing hutchinsonite seen by TEM, Tl(III) increasing with depth (XPS). Three end-member model (bedrock +0.84, lorandite -1.65, tailings +4.7): weathered and dispersed lorandite supplies 65 to 95 % of Tl in A and 45 to 72 % in B, mine tailings on average 27 % and 18 % (Lu et al., 2026). Indicative coordinates of the deposit: exact profile location not published.
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.24 ε | −3.93 / 0.43 ε | 14 | soil of profile A (0-140 cm) Published mean of 14 analyses, standard deviation not published; minimum of -3.93 at 60 cm, with no Mn, Fe or S peak: dynamic accumulation of leached light Tl; 62.0 to 104.0 mg/kg Tl (mean 75.5). | Lu et al. (2026), Thallium isotopic compositions reveal a significant contribution of tha… |
| −1.01 ε | −3.15 / 0.62 ε | 10 | soil of profile B (0-150 cm) Published mean of 10 analyses, standard deviation not published; maximum of +0.62 ± 0.45 at 105 cm in the yellow weathered rock (inherited fractionation), minimum of -3.15 at 120 cm where Fe and S peak (sulphides); jump at 45 cm, boundary between grey-black organic soil and yellow horizon, where Mn and bioavailable Tl increase; 15.2 to 138.5 mg/kg Tl (mean 43.3). | Lu et al. (2026), Thallium isotopic compositions reveal a significant contribution of tha… |
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Cite this page
IsoFind Atlas (2026). Luchengjiang soil profiles, outside the Lanmuchang mining zone, isotope signatures. https://www.isofind.tech/isotopes/en/sites/profils-de-sols-de-luchengjiang-hors-de-la-zone-miniere-de-lanmuchang/ (accessed 2026-10-16).
@misc{isofind2026luchengjiangsoilprofilesoutsi,
title = {Luchengjiang soil profiles, outside the Lanmuchang mining zone, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/profils-de-sols-de-luchengjiang-hors-de-la-zone-miniere-de-lanmuchang/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16