Gongchangling
Anshan-Benxi, Liaoning, China
Banded iron formationsFe
- Type
- Neoarchaean banded iron formation, with hydrothermal high-grade ore
A major iron deposit of the Anshan-Benxi district. The Neoarchaean BIFs were deposited from a mixture of seawater and high-temperature hydrothermal fluids; the high-grade magnetite ore (over 45% iron) results from a Palaeoproterozoic hydrothermal overprint, at 480 to 600 °C.
δ56Fe in ‰ (per mil) Values of the same system
Standard : IRMM-014
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.82 ± 0.28 ‰ | 0.16 / 1.164 ‰ | 12 | high-grade ore magnetite Mean and standard deviation of 12 analyses. Table 2, including the data of Li et al. compiled in the article. High-grade ore is heavier than the BIF. | Fu et al. (2023), Fe-Si-C isotope constraints on the genesis of iron ores in Gongchanglin… |
| 0.45 ± 0.21 ‰ | 0.233 / 0.78 ‰ | 7 | BIF magnetite Mean and standard deviation of 7 analyses. | Fu et al. (2023), Fe-Si-C isotope constraints on the genesis of iron ores in Gongchanglin… |
| 0.55 ± 0.03 ‰ | 0.53 / 0.57 ‰ | 2 | banded hematite ore magnetite Mean and standard deviation of 2 analyses. | Fu et al. (2023), Fe-Si-C isotope constraints on the genesis of iron ores in Gongchanglin… |
δ30Si in ‰ (per mil) Values of the same system
Standard : NBS 28
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.47 ± 0.2 ‰ | −0.64 / −0.24 ‰ | 6 | high-grade ore quartz Mean and standard deviation of 6 analyses. | Fu et al. (2023), Fe-Si-C isotope constraints on the genesis of iron ores in Gongchanglin… |
| −1.43 ± 0.53 ‰ | −2.2 / −1 ‰ | 4 | BIF quartz Mean and standard deviation of 4 analyses. Silicon depleted in 30Si, as in submarine hydrothermal deposits. | Fu et al. (2023), Fe-Si-C isotope constraints on the genesis of iron ores in Gongchanglin… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −16.18 ± 2.32 ‰ | −19.6 / −14.5 ‰ | 4 | high-grade ore graphite Mean and standard deviation of 4 analyses. Organic carbon. | Fu et al. (2023), Fe-Si-C isotope constraints on the genesis of iron ores in Gongchanglin… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −1.32 ± 2.28 ‰ | −4 / 2.7 ‰ | 13 | high-grade ore magnetite Mean and standard deviation of 13 analyses. Table 2, including the data of Li et al. High-grade ore magnetite is lighter than BIF magnetite, a sign of a hydrothermal fluid. | Wang et al. (2024), Paleoproterozoic hydrothermal overprinting over Neoarchean banded iro… |
| 1.8 ± 1.08 ‰ | 0.3 / 3.3 ‰ | 5 | BIF magnetite Mean and standard deviation of 5 analyses. | Wang et al. (2024), Paleoproterozoic hydrothermal overprinting over Neoarchean banded iro… |
| 13.39 ± 1.29 ‰ | 10.3 / 15 ‰ | 15 | BIF quartz Mean and standard deviation of 15 analyses. | Wang et al. (2024), Paleoproterozoic hydrothermal overprinting over Neoarchean banded iro… |
| 8.2 ± 1.57 ‰ | 6.5 / 9.6 ‰ | 3 | high-grade ore quartz Mean and standard deviation of 3 analyses. | Wang et al. (2024), Paleoproterozoic hydrothermal overprinting over Neoarchean banded iro… |
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 9.43 ± 2.65 ‰ | 5.5 / 11.2 ‰ | 4 | pyrite of high-grade ore and altered wall rocks Mean and standard deviation of 4 analyses. | Wang et al. (2024), Paleoproterozoic hydrothermal overprinting over Neoarchean banded iro… |
| 0.27 ± 1.02 ‰ | −0.9 / 1.4 ‰ | 4 | BIF pyrite Mean and standard deviation of 4 analyses. | Wang et al. (2024), Paleoproterozoic hydrothermal overprinting over Neoarchean banded iro… |
Deposits of the same type
- Isua (BIF) Greenland
- Cauê Formation (Quadrilátero Ferrífero) Brazil
- Carajás Brazil
Cite this page
IsoFind Atlas (2026). Gongchangling, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/gongchangling/ (accessed 2026-10-06).
@misc{isofind2026gongchanglingisotopesignature,
title = {Gongchangling, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/gongchangling/},
note = {Accessed 2026-10-06}
}Updated : 2026-10-06