Lanuoma
Tibet, Changdu area (about 10 km north of Jitang), China
Mississippi Valley TypePb-Zn-Sb
- Type
- Pb-Zn-Sb hosted in Upper Triassic limestones
Pb-Zn deposit hosted in Upper Triassic sediments of the Changdu (Qamdo) area, eastern Tibet. Sulfide mercury, with negative MIF like the metamorphic basement and altered rocks but unlike barren sediments, would come mainly from the underlying basement. Resource of 0.47 Mt Pb + Zn and 0.17 Mt Sb, in Bolila Formation limestones; late robinsonite. Indicative coordinates.
δ202Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.31 ± 0.19 ‰ | −0.57 / −0.05 ‰ | 7 | sphalerite Mean and standard deviation recalculated from 7 samples, Table 2. Hg of 436 to 1185 ppm. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| 0.36 ± 0.43 ‰ | −0.17 / 1.01 ‰ | 7 | late robinsonite Mean and standard deviation recalculated from 7 samples, Table 2. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| −0.18 ± 1.13 ‰ | −0.98 / 0.62 ‰ | 2 | regional metamorphic basement (Jitang Group schists) Mean and standard deviation recalculated from 2 samples, Table 1. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| −0.14 ± 0.49 ‰ | −0.61 / 0.53 ‰ | 4 | altered Upper Triassic rocks around the deposit Mean and standard deviation recalculated from 4 samples, Table 1. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| −1.15 ± 0.5 ‰ | −1.82 / −0.34 ‰ | 7 | regional barren sedimentary rocks (Upper Triassic and Jurassic) Mean and standard deviation recalculated from 7 samples, Table 1. No significant MIF, unlike the sulfides. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
Δ199Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.07 ± 0.03 ‰ | −0.12 / −0.04 ‰ | 7 | sphalerite Mean and standard deviation recalculated from 7 samples, Table 2. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| −0.1 ± 0.06 ‰ | −0.23 / −0.05 ‰ | 7 | late robinsonite Mean and standard deviation recalculated from 7 samples, Table 2. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| −0.12 ± 0.06 ‰ | −0.16 / −0.08 ‰ | 2 | regional metamorphic basement (Jitang Group schists) Mean and standard deviation recalculated from 2 samples, Table 1. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| −0.04 ± 0.09 ‰ | −0.17 / 0.04 ‰ | 4 | altered Upper Triassic rocks around the deposit Mean and standard deviation recalculated from 4 samples, Table 1. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
| −0.01 ± 0.04 ‰ | −0.06 / 0.06 ‰ | 7 | regional barren sedimentary rocks (Upper Triassic and Jurassic) Mean and standard deviation recalculated from 7 samples, Table 1. | Xu et al. (2018), Mercury isotope constraints on the source for sediment-hosted lead-zinc… |
Deposits of the same type
- Jinding China
- Tianbaoshan China
- Daliangzi China
- Maoping China
- Huize China
- Banbanqiao China
- Shaojiwan China
- Shanshulin China
Cite this page
IsoFind Atlas (2026). Lanuoma, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/lanuoma/ (accessed 2026-10-13).
@misc{isofind2026lanuomaisotopesignatures,
title = {Lanuoma, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/lanuoma/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13