Piaohechuan (No. 4 intrusion)
Central Jilin, China
Magmatic (Ni-Cu-PGE, carbonatites)Ni-Cu (PGE)
- Type
- Magmatic Ni-Cu sulfides in a small gabbroic intrusion
Small Triassic (about 216 Ma) hornblende-olivine gabbro intrusion at the eastern end of the Central Asian orogenic belt, with about 10,000 t Ni. Little-variable Nd but highly radiogenic Sr and Os point to assimilation of crustal sulfur in a shallow chamber; the sulfide liquid migrated through partially molten silicates to form the network and breccia ores. Indicative coordinates.
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.706034 ± 0.000333 | 0.705675 / 0.706472 | 4 | sulfide ore (breccia, network, globular), present-day ratio Mean and standard deviation of 4 samples, Table 5. The text wrongly assigns these values (0.7057 to 0.7065) to initial ratios. | Wei et al. (2015), Textural Relationship of Sulfide Ores, PGE, and Sr-Nd-Os Isotope Compo… |
| 0.70479 ± 0.00017 | 0.70464 / 0.70499 | 4 | sulfide ore, initial ratio (87Sr/86Sr)i at 216 Ma Mean and standard deviation of 4 samples, Table 5. Shifted to the right of the mantle Sr-Nd array. | Wei et al. (2015), Textural Relationship of Sulfide Ores, PGE, and Sr-Nd-Os Isotope Compo… |
εNd(t) in ε units (parts per 10,000) Values of the same system
Standard : CHUR
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 4.5 ± 0.08 ε | 4.4 / 4.6 ε | 4 | sulfide ore, at 216 Ma Mean and standard deviation of 4 samples, Table 5; present-day 143Nd/144Nd from 0.512775 to 0.512795. Short-residence crustal component. | Wei et al. (2015), Textural Relationship of Sulfide Ores, PGE, and Sr-Nd-Os Isotope Compo… |
187Os/188Os isotope ratio, no unit Values of the same system
Standard : Rapport absolu, sans standard de référence
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.1915 ± 0.0088 | 0.1748 / 0.2096 | 14 | sulfide ore, initial ratio (187Os/188Os)i at 216 Ma Mean and standard deviation of 14 samples, Table 6; γOs from 39 to 67, a sign of assimilation of crustal material. The PH-11 row (network ore) exactly repeats that of PH-1 (breccia) in Table 6: a probable duplicate, counted as published. | Wei et al. (2015), Textural Relationship of Sulfide Ores, PGE, and Sr-Nd-Os Isotope Compo… |
| 0.3271 ± 0.0338 | 0.2908 / 0.3748 | 14 | sulfide ore, present-day ratio Mean and standard deviation of 14 samples, Table 6; 187Re/188Os from 26.25 to 52.30. The PH-11 row (network ore) exactly repeats that of PH-1 (breccia) in Table 6: a probable duplicate, counted as published. | Wei et al. (2015), Textural Relationship of Sulfide Ores, PGE, and Sr-Nd-Os Isotope Compo… |
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- Jinchuan China
- Jiajika, No. X03 vein China
- Luobusa China
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Cite this page
IsoFind Atlas (2026). Piaohechuan (No. 4 intrusion), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/piaohechuan-intrusion-n-4/ (accessed 2026-10-13).
@misc{isofind2026piaohechuanno4intrusionisotop,
title = {Piaohechuan (No. 4 intrusion), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/piaohechuan-intrusion-n-4/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13