Tongkeng (Changpo-Tongkeng)
Dachang ore field, Nandan County, Hechi, Guangxi, China
Other hydrothermalSn-Zn-Pb-Sb-Cu
- Type
- Granite-related stratiform and vein Sn-polymetallic
Largest deposit of the Dachang field (680,000 t Sn at 1 %, 4.5 Mt Zn at 4 %, 80,000 t Cu): Sn-polymetallic ore at the top and newly found Zn-Cu ore below, as layers and veins in Middle to Upper Devonian siliceous and carbonate rocks. Homogeneous zinc comes from the fluid of the Cretaceous Longxianggai granite (91 to 94 Ma); helium also shows a contribution of Devonian exhalative sediments. Coordinates of the mining settlement.
δ66Zn in ‰ (per mil) Values of the same system
Standard : JMC 3-0749L
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.27 ± 0.04 ‰ | 0.22 / 0.31 ‰ | 4 | sphalerite of the upper Sn-polymetallic ore (orebodies No. 91 and 92) Mean and standard deviation recalculated from 4 samples, Table 1. Authors' conversion (+0.33 ‰), larger than the usual 0.27 to 0.30 ‰ offset. | Cai et al. (2020), Zn, He-Ar and Sr-Nd isotopic compositions of the Tongkeng tin-polymeta… |
| 0.3 ± 0.05 ‰ | 0.24 / 0.34 ‰ | 3 | sphalerite of the lower Zn-Cu ore (orebody No. 96) Mean and standard deviation recalculated from 3 samples, Table 1. No difference from the upper ore. Authors' conversion (+0.33 ‰), larger than the usual 0.27 to 0.30 ‰ offset. | Cai et al. (2020), Zn, He-Ar and Sr-Nd isotopic compositions of the Tongkeng tin-polymeta… |
| 0.48 ± 0.1 ‰ | 0.41 / 0.55 ‰ | 2 | Longxianggai granite (biotite granite and porphyritic granite) Mean and standard deviation recalculated from 2 samples, Table 1. Ore fluid calculated at 0.42 to 0.54 ‰, like the granite. Authors' conversion (+0.33 ‰), larger than the usual 0.27 to 0.30 ‰ offset. | Cai et al. (2020), Zn, He-Ar and Sr-Nd isotopic compositions of the Tongkeng tin-polymeta… |
εNd(t) in ε units (parts per 10,000) Values of the same system
Standard : CHUR
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −8.8 ± 0.6 ε | −9.6 / −7.9 ε | 8 | Longxianggai granite (whole rock) Mean and standard deviation recalculated from 8 samples, Table 3. Crust-derived S-type granite (T2DM model ages 1.54 to 1.68 Ga). Initial 87Sr/86Sr ratios (0.706 to 0.732), deemed unreliable by the authors because of very high Rb/Sr, are not entered. | Cai et al. (2020), Zn, He-Ar and Sr-Nd isotopic compositions of the Tongkeng tin-polymeta… |
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −4.9 ‰ | 2 | pyrite from ore body no. 91 Published mean of 2 analyses, ore body no. 91 (Upper Devonian, Wuzhishan Formation), samples 1 and 2. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| −3.14 ‰ | 7 | sphalerite from ore body no. 91 Published mean of 7 analyses, ore body no. 91 (Upper Devonian, Wuzhishan Formation), samples 3 to 10. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| −3.17 ‰ | 3 | pyrrhotite from ore body no. 91 Published mean of 3 analyses, ore body no. 91 (Upper Devonian, Wuzhishan Formation), samples 3 to 10. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| −4.3 ‰ | 3 | pyrite from ore body no. 91 Published mean of 3 analyses, ore body no. 91 (Upper Devonian, Wuzhishan Formation), samples 3 to 10. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| 0.1 ‰ | 2 | arsenopyrite from ore body no. 91 Published mean of 2 analyses, ore body no. 91 (Upper Devonian, Wuzhishan Formation), samples 3 to 10. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| 0.56 ‰ | 5 | sphalerite from ore body no. 92 Published mean of 5 analyses, ore body no. 92 (Upper Devonian, Liujiang Formation), samples 11 to 19. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| 0.67 ‰ | 6 | pyrite from ore body no. 92 Published mean of 6 analyses, ore body no. 92 (Upper Devonian, Liujiang Formation), samples 11 to 19. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| 0.9 ‰ | 1 | arsenopyrite from ore body no. 92 Single analysis, ore body no. 92 (Upper Devonian, Liujiang Formation), samples 11 to 19. Values re-read from the image of Table 5: the text layer drops minus signs. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… | |
| −0.05 ‰ | 2 | chalcopyrite from ore body no. 92 Published mean of 2 analyses, ore body no. 92 (Upper Devonian, Liujiang Formation), samples 11 to 19. Values re-read from the image of Table 5: the text layer drops minus signs. The abstract gives -4.9 to +2.6 ‰ for Tongkeng-Changpo, the text and table -4.9 to +0.9 ‰. | Fan et al. (2004), Geochemistry and origin of tin-polymetallic sulfide deposits hosted by… |
δ30Si in ‰ (per mil) Values of the same system
Standard : NBS 28
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.6 / −0.1 ‰ | laminated siliceous and K-feldspar rocks associated with cassiterite-sulfide ore Second-hand data: review by Wang et al. (2019) after Ding et al. (1996). The Dachang ore field is not split by deposit; attached to Tongkeng (Changpo-Tongkeng), the main stratiform orebody. Barren radiolarian siliceous rocks give +0.2 to +0.8 ‰ (δ18O +12.0 to +21.4 ‰). Negative δ30Si and uniform δ18O read as a submarine hydrothermal rather than Yanshanian magmatic origin. | Wang et al. (2019), Silicon isotope geochemistry: fractionation linked to silicon complex… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 13.2 / 16 ‰ | laminated siliceous and K-feldspar rocks associated with cassiterite-sulfide ore Second-hand data: review by Wang et al. (2019) after Ding et al. (1996). The Dachang ore field is not split by deposit; attached to Tongkeng (Changpo-Tongkeng), the main stratiform orebody. Barren radiolarian siliceous rocks give +0.2 to +0.8 ‰ (δ18O +12.0 to +21.4 ‰). Whole rock. | Wang et al. (2019), Silicon isotope geochemistry: fractionation linked to silicon complex… |
Deposits of the same type
Cite this page
IsoFind Atlas (2026). Tongkeng (Changpo-Tongkeng), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/tongkeng-changpo-tongkeng/ (accessed 2026-10-13).
@misc{isofind2026tongkengchangpotongkengisotop,
title = {Tongkeng (Changpo-Tongkeng), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/tongkeng-changpo-tongkeng/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13