Lala
Sichuan, Huili (Kangdian IOCG province, western Yangtze Block), China
IOCGFe-Cu (Mo, Co, ETR)
- Type
- Iron oxide-copper-gold (IOCG)
One of the largest deposits of the Kangdian IOCG province, mined since the Ming dynasty: over 200 Mt of ore at 13 % Fe, 0.92 % Cu, 0.018 % Mo, 0.022 % Co, 0.25 % rare earth oxides and 0.16 ppm Au, in roughly strata-bound bodies along foliation, contacts and shear zones of the Hekou Group (Palaeoproterozoic), metamorphosed at about 850 Ma. Five stages: albitisation (I), Ti-V-poor magnetite-apatite (II), magnetite and Fe-Cu-Mo sulphides (III), chalcopyrite-quartz-calcite-biotite veins (IV), barren hematite-calcite veins (V). Stage III molybdenite Re-Os age of 1086 ± 8 Ma, coeval with intraplate magmatism at about 1100 Ma. Magmatic-hydrothermal fluids in stages II and III (δ18O +7.2 to +11.7 ‰, δ34S 0 to +4 ‰, carbon partly from host marbles), country-rock sulphur in stage IV, oxidised meteoric waters in stage V according to Chen and Zhou (2012). Coordinates from Mindat (Shilong mine, Lalachang deposit).
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −2.6 ‰ | 1 | stage II pyrite (magnetite-apatite, LL-96) Single analysis. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… | |
| 0.42 ± 2.21 ‰ | −3.2 / 3.2 ‰ | 6 | stage II chalcopyrite (magnetite-apatite) Mean and standard deviation recalculated from 6 analyses, one value from this study (LL-158), the others compiled; stage mean about +0.1 ‰ according to the authors. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 2.39 ± 1.27 ‰ | 0.2 / 4.9 ‰ | 19 | stage III pyrite (magnetite and polymetallic sulphides) Mean and standard deviation recalculated from 19 analyses, three values from this study, the others compiled. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 1.69 ± 2.78 ‰ | −5.3 / 9 ‰ | 17 | stage III chalcopyrite (magnetite and polymetallic sulphides) Mean and standard deviation recalculated from 17 analyses, values compiled from Shentu (1997) and Sun et al. (2006); stage fluid centred at about +2.0 ‰. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| −0.8 ‰ | 1 | stage III pyrrhotite (LL-62-2) Single analysis. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… | |
| 1.1 ± 2.12 ‰ | −0.4 / 2.6 ‰ | 2 | stage III bornite Mean and standard deviation recalculated from 2 analyses, values from Sun et al. (2006). | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 1.49 ± 4.43 ‰ | −9 / 10.5 ‰ | 14 | stage IV chalcopyrite (sulphide-quartz-calcite veins) Mean and standard deviation recalculated from 14 analyses, three values from this study (LL-135-2, LL-147, LL-143); spread ascribed to country-rock sulphur (sulphates, organic sulphur). | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 2.65 ± 0.64 ‰ | 2.2 / 3.1 ‰ | 2 | stage IV pyrite (sulphide-quartz-calcite veins) Mean and standard deviation recalculated from 2 analyses, values from Shentu (1997). | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 10.85 ± 3.28 ‰ | 6.3 / 14 ‰ | 4 | stage I albitised rocks (whole rock) Mean and standard deviation recalculated from 4 analyses, values from Sun et al. (2006); above 430 °C. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 2.67 ± 1.09 ‰ | 1.9 / 4.8 ‰ | 6 | stage II magnetite (magnetite-apatite) Mean and standard deviation recalculated from 6 analyses, fluid calculated at +8.8 to +11.7 ‰ at 400 °C. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 2.2 ± 0.45 ‰ | 1.4 / 2.6 ‰ | 6 | stage III magnetite (magnetite and sulphides) Mean and standard deviation recalculated from 6 analyses, fluid calculated at +8.4 to +9.6 ‰ at 390 °C. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 10.8 ± 0.28 ‰ | 10.6 / 11 ‰ | 2 | stage III calcite (LL-122, LL-143) Mean and standard deviation recalculated from 2 analyses, fluid at +7.2 and +7.5 ‰. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 10.98 ± 0.91 ‰ | 9.7 / 12.2 ‰ | 6 | stage IV calcite (sulphide veins) Mean and standard deviation recalculated from 6 analyses, two values from Sun et al. (2006); fluid +4.1 to +6.7 ‰ at 300 °C, close to the non-magmatic Cu stage at Mantoverde. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| 9.9 ± 1.47 ‰ | 8.1 / 11.6 ‰ | 6 | stage V calcite (barren hematite veins) Mean and standard deviation recalculated from 6 analyses, two values from Sun et al. (2006); fluid -2.9 to +0.6 ‰ at 175 °C, meteoric input. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −3.15 ± 0.07 ‰ | −3.2 / −3.1 ‰ | 2 | stage III calcite (LL-122, LL-143) Mean and standard deviation recalculated from 2 analyses, fluid at about -0.5 ‰, close to the least altered host marbles (0 to +2 ‰). | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| −1.85 ± 1.07 ‰ | −2.8 / 0 ‰ | 6 | stage IV calcite (sulphide veins) Mean and standard deviation recalculated from 6 analyses, two values from Sun et al. (2006); fluid -0.7 to +2.1 ‰. | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
| −2.6 ± 0.8 ‰ | −3.1 / −1.4 ‰ | 4 | stage V calcite (barren hematite veins) Mean and standard deviation recalculated from 4 analyses, fluid -4.1 to -2.4 ‰ (-4.0 ‰ in the abstract). | Chen et Zhou (2012), Paragenesis, Stable Isotopes, and Molybdenite Re-Os Isotope Age of t… |
Deposits of the same type
- Singhbhum Copper Belt India
- Khetri Copper Belt, Chandmari India
- Khetri Copper Belt, Madan Kudan and Kolihan India
- Bafq district Iran
- Olympic Dam Australia
- Olympic Dam Australia
- Teltaja (Lannavaara) Sweden
- Kevus (Lannavaara) Sweden
Cite this page
IsoFind Atlas (2026). Lala, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/lala/ (accessed 2026-10-15).
@misc{isofind2026lalaisotopesignatures,
title = {Lala, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/lala/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15