Huayuan district (Dong Li, Lomichang, Ma Chang, Paiwu)
Western Hunan, Hunan-Guizhou orogenic belt, China
Mississippi Valley TypeZn-Pb (Ba, F)
- Type
- Lower Cambrian carbonate-hosted Zn-Pb (MVT type)
Deposits in Qingxudong Formation limestones: main stage with cockade sphalerite, galena, pyrite, fluorite, barite and calcite, then a stage with rosette sphalerite, saddle dolomite and bitumen. Lead mixes old crust and a high Th/U reservoir, and cement Sr becomes more radiogenic through the paragenesis due to an external fluid. Indicative coordinates.
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.187 ± 0.017 | 18.162 / 18.225 | 12 | main-stage sulfides (cockade sphalerite, galena, pyrite) Mean and standard deviation recalculated from 12 analyses, Table 1. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
| 18.245 ± 0.067 | 18.198 / 18.293 | 2 | rosette sphalerite (non-economic stage) Mean and standard deviation recalculated from 2 analyses, Table 1. Off the main-stage mixing line. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.751 ± 0.018 | 15.724 / 15.796 | 12 | main-stage sulfides (cockade sphalerite, galena, pyrite) Mean and standard deviation recalculated from 12 analyses, Table 1. Linear array (binary mixing of two crustal sources). | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
| 15.62 ± 0.136 | 15.524 / 15.717 | 2 | rosette sphalerite (non-economic stage) Mean and standard deviation recalculated from 2 analyses, Table 1. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.456 ± 0.055 | 38.38 / 38.594 | 12 | main-stage sulfides (cockade sphalerite, galena, pyrite) Mean and standard deviation recalculated from 12 analyses, Table 1. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
| 38.355 ± 0.013 | 38.346 / 38.364 | 2 | rosette sphalerite (non-economic stage) Mean and standard deviation recalculated from 2 analyses, Table 1. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.70903 ± 0.00022 | 0.70889 / 0.70936 | 4 | Qingxudong Formation host limestone Mean and standard deviation recalculated from 4 samples, Table 3. Close to Cambrian marine Sr. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
| 0.70927 ± 0.00015 | 0.70905 / 0.7094 | 4 | main-stage calcite I Mean and standard deviation recalculated from 4 samples, Table 3. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
| 0.70973 ± 0.00031 | 0.7094 / 0.71006 | 4 | calcite II Mean and standard deviation recalculated from 4 samples, Table 3. Most radiogenic value of the district (0.71006). | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
| 0.70977 | 1 | saddle dolomite (II) One analysis, Table 3. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… | |
| 0.70923 ± 0.00003 | 0.7092 / 0.70927 | 6 | barite (Ma Chang) Mean and standard deviation recalculated from 6 samples, Table 3. | Schneider et al. (2002), Carbonate-hosted zinc-lead deposits in the Lower Cambrian of Hun… |
Deposits of the same type
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- Banbanqiao China
- Maoping China
Cite this page
IsoFind Atlas (2026). Huayuan district (Dong Li, Lomichang, Ma Chang, Paiwu), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/district-de-huayuan-dong-li-lomichang-ma-chang-paiwu/ (accessed 2026-10-13).
@misc{isofind2026huayuandistrictdonglilomichan,
title = {Huayuan district (Dong Li, Lomichang, Ma Chang, Paiwu), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/district-de-huayuan-dong-li-lomichang-ma-chang-paiwu/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13