Dexing (Tongchang, Fujiawu and Zhushahong)
Northeastern Jiangxi, southeastern margin of the Yangtze Block, China
PorphyriesCu-Mo-Au
- Type
- Porphyry copper (Cu-Mo-Au)
Three adakitic granodiorite porphyry plutons (with minor quartz diorite porphyry), emplaced around 169 to 173 Ma in Mesoproterozoic metamorphic rocks of the Shuangqiaoshan Group, hosting the giant Tongchang, Fujiawu and Zhushahong porphyry copper deposits. Fan et al. (2020): fresh rocks with δ11B from -17.65 to -11.49 ‰, delaminated mafic lower crust source followed by interaction with the mantle.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −17.65 / −11.49 ‰ | 7 | whole rock, fresh granodiorite porphyries (loss on ignition below 2.2 %) Range only. 7.1 to 13.9 ppm B, (87Sr/86Sr)i 0.7045 to 0.7047. | Fan et al. (2020), Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralizati… | |
| −30.58 / −21.1 ‰ | 5 | whole rock, altered porphyries (argillization, chloritization, carbonatization) Range only. Five samples with 23.5 to 98.0 ppm B, (87Sr/86Sr)i 0.7061 to 0.7098 and loss on ignition 4.43 to 6.53 %; boron and δ11B modified by hydrothermal fluids according to the authors. | Fan et al. (2020), Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralizati… |
δ98Mo in ‰ (per mil) Values of the same system
Standard : NIST SRM 3134
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.31 / −0.01 ‰ | 10 | whole rock, granodiorite porphyries Range only (δ98/95Mo). Ten samples with 0.55 to 5.74 ppm Mo; two others, affected by hydrothermal sulphides, are excluded: 01TC-17 at -0.76 ‰ (145 ppm Mo) and one sample at +0.54 ‰ (9.75 ppm). | Fan et al. (2020), Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralizati… |
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Cite this page
IsoFind Atlas (2026). Dexing (Tongchang, Fujiawu and Zhushahong), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/dexing-tongchang-fujiawu-et-zhushahong/ (accessed 2026-10-20).
@misc{isofind2026dexingtongchangfujiawuandzhus,
title = {Dexing (Tongchang, Fujiawu and Zhushahong), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/dexing-tongchang-fujiawu-et-zhushahong/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20