Machangqing
Xiangyun County, Dali, Yunnan, China
PorphyriesCu-Mo-Au
- Type
- Cu-Mo-Au porphyry related to an alkali-rich quartz monzonite porphyry
Cenozoic alkali-rich porphyry belt of Jinshajiang-Ailaoshan (western Yunnan): silicon of the mineralising fluids (silicified quartz, hemimorphite) lighter than that of the porphyries (0.0 to 0.4 ‰), two sources according to the authors. Biotite quartz monzonite porphyry, Cu-Mo quartz veins, gold-bearing host sandstones (Lower Ordovician). Approximate position of the district. Indicative coordinates.
δ30Si in ‰ (per mil) Values of the same system
Standard : NBS 28
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.1 ‰ | 1 | silicified quartz of Cu-Mo veins Single analysis, MM-32-1. Porphyry quartz phenocryst 0.1 ‰ (MM-9-2), lamprophyre dyke 0.4 ‰, mineralised sandstone 0.4 ‰, host siltstone -0.2 ‰. | Liu et al. (2004), Geochemical trace of silicon isotopes of intrusions and ore veins rela… |
Deposits of the same type
- Qulong China
- Sharang China
- Jiru China
- Zhuonuo China
- Yanbei China
- Chagele China
- Lianhuashan China
- Oyu Tolgoi Mongolia
Cite this page
IsoFind Atlas (2026). Machangqing, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/machangqing/ (accessed 2026-10-13).
@misc{isofind2026machangqingisotopesignatures,
title = {Machangqing, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/machangqing/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13