Yixingzhai
Shanxi, Fanshi (North China Craton), China
Other hydrothermalAu (Ag)
- Type
- Lode gold (auriferous quartz veins) in Archean TTG and a Cretaceous granite porphyry
About 50 t gold, one of the largest gold deposits of the North China Craton: NW to NNW quartz veins 0.05 to 4.30 m thick controlled by secondary faults. Four stages: quartz-hematite-pyrite (I, 303-405 °C, boiling), quartz-pyrite-electrum (II, 263-320 °C), quartz-pyrite-chalcopyrite-sphalerite-galena-electrum-argentite (III, 220-280 °C) and barren quartz-calcite (IV); magmatic-hydrothermal fluids (Li, 2022). Zeng et al. (2026): stage III electrum from -1.53 to -0.40 ‰ in δ109Ag, argentite from -0.11 to +0.17 ‰, an offset ascribed to inheritance from early boiling. Samples from the 510 m adit. Indicative coordinates: mine position from its Mindat entry (39°23′30″ N, 113°34′59″ E), not published by Zeng et al. (2026).
δ109Ag in ‰ (per mil) Values of the same system
Standard : NIST SRM 978a
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.83 ± 0.26 ‰ | −1.53 / −0.4 ‰ | 37 | stage III electrum (in situ) Mean and standard deviation recalculated from 37 analyses, -1.53 to -0.40 (III-2-1 -0.58; III-2-2 -1.53; III-2-3 -1.49; III-2-4 -1.36; III-2-5 -1.15; III-2-6 -0.74; III-2-7 -1.08; III-2-8 -0.99; III-2-9 -0.93; III-2-10 -0.91; III-2-11 -0.90; III-2-12 -0.87; III-2-13 -0.83; III-2-14 -0.82; III-2-15 -0.76; III-2-16 -0.57; III-2-17 -0.61; III-2-18 -0.74; III-2-19 -0.47; III-2-20 -0.40; III-2-21 -0.49; III-2-22 -0.51; III-2-23 -0.64; III-2-24 -0.50; III-2-25 -1.03; III-2-26 -0.92; III-2-27 -0.92; III-2-28 -0.90; III-2-29 -0.55; III-2-30 -0.86; III-2-31 -0.83; III-2-32 -0.74; III-2-33 -0.83; III-2-34 -0.93; III-2-35 -0.78; III-2-36 -0.89; III-2-37 -0.65). Published mean -0.83 ± 0.52 ‰ (2SD). Au/Ag (wt%, microprobe): III-2-1 67.09/29.65; III-2-2 87.37/13.10; III-2-3 66.83/31.57; III-2-4 84.94/14.19; III-2-5 82.26/16.23; III-2-6 70.32/28.04; III-2-7 73.27/25.25; III-2-8 70.97/26.88; III-2-9 75.47/23.59; III-2-10 75.31/23.70; III-2-11 74.98/24.05; III-2-12 67.29/30.86; III-2-13 88.19/9.76; III-2-14 76.57/22.81; III-2-15 74.32/23.85; III-2-16 75.75/23.09; III-2-17 68.97/29.17; III-2-18 79.12/21.59; III-2-19 77.84/19.49; III-2-20 85.01/12.83; III-2-21 73.04/24.76; III-2-22 76.40/21.72; III-2-23 68.87/29.12; III-2-24 75.50/23.28; III-2-25 70.01/28.85; III-2-26 74.70/25.74; III-2-27 72.96/26.65; III-2-28 74.05/23.92; III-2-29 91.55/8.40; III-2-30 69.57/28.46; III-2-31 84.31/13.80; III-2-32 3.87/5.84; III-2-33 70.12/29.41; III-2-34 72.15/27.31; III-2-35 75.71/24.65; III-2-36 70.55/28.60; III-2-37 73.14/23.77. Grain III-2-32 is printed at 3.87 % Au and 5.84 % Ag, an incomplete total; the published means of Au (73.95 %) and Ag (22.45 %) are not exactly recovered from the table. Section 4 gives -1.49 ‰ as the lower bound, the table -1.53 ‰. | Zeng et al. (2026), In-situ silver isotope analysis of Electrum and Ag2S using LA-MC-ICP-… |
| 0.06 ± 0.06 ‰ | −0.11 / 0.17 ‰ | 73 | stage III argentite (Ag2S) (in situ) Mean and standard deviation recalculated from 73 analyses, -0.11 to +0.17 (III-2-1 +0.12; III-2-2 +0.11; III-2-3 +0.14; III-2-4 +0.13; III-2-5 +0.12; III-2-6 +0.09; III-2-7 +0.11; III-2-8 +0.14; III-2-9 +0.15; III-2-10 +0.07; III-2-11 +0.08; III-2-12 +0.05; III-2-13 +0.01; III-2-14 +0.03; III-2-15 -0.01; III-2-16 +0.03; III-2-17 +0.07; III-2-18 +0.07; III-2-19 -0.03; III-2-20 +0.05; III-2-21 +0.02; III-2-22 +0.07; III-2-23 +0.08; III-2-24 +0.13; III-2-25 +0.12; III-2-26 +0.02; III-2-27 +0.05; III-2-28 +0.14; III-2-29 +0.07; III-2-30 +0.07; III-2-31 +0.09; III-2-32 +0.14; III-2-33 +0.16; III-2-34 +0.06; III-2-35 +0.09; III-2-36 +0.11; III-2-37 +0.02; III-2-38 +0.06; III-2-39 +0.06; III-2-40 +0.08; III-2-41 -0.11; III-2-42 +0.02; III-2-43 +0.07; III-2-44 +0.06; III-2-45 +0.12; III-2-46 +0.07; III-2-47 +0.12; III-2-48 +0.17; III-2-49 +0.10; III-2-50 +0.16; III-2-51 +0.04; III-2-52 +0.04; III-2-53 +0.12; III-2-54 +0.10; III-2-55 +0.13; III-2-56 +0.13; III-2-57 +0.12; III-2-58 +0.03; III-2-59 -0.02; III-2-60 0.00; III-2-61 +0.02; III-2-62 -0.02; III-2-63 -0.02; III-2-64 -0.06; III-2-65 +0.01; III-2-66 -0.04; III-2-67 -0.01; III-2-68 +0.09; III-2-69 +0.07; III-2-70 +0.08; III-2-71 +0.02; III-2-72 -0.06; III-2-73 -0.04). Published mean +0.06 ± 0.12 ‰ (2SD, n = 73). Grains 50 to more than 200 µm at pyrite and chalcopyrite boundaries; calibration on IAEA-S-1. | Zeng et al. (2026), In-situ silver isotope analysis of Electrum and Ag2S using LA-MC-ICP-… |
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.12 ± 0.55 ‰ | −0.18 / 2.41 ‰ | 37 | pyrite hosting the electrum, stage III (in situ) Mean and standard deviation recalculated from 37 analyses, -0.18 to +2.41 (pyrite next to III-2-1 +1.42; pyrite next to III-2-2 +1.55; pyrite next to III-2-3 +0.71; pyrite next to III-2-4 +1.16; pyrite next to III-2-5 +0.80; pyrite next to III-2-6 +0.80; pyrite next to III-2-7 +0.80; pyrite next to III-2-8 +1.22; pyrite next to III-2-9 +0.79; pyrite next to III-2-10 +1.21; pyrite next to III-2-11 +1.05; pyrite next to III-2-12 +1.13; pyrite next to III-2-13 +0.98; pyrite next to III-2-14 +1.02; pyrite next to III-2-15 +1.27; pyrite next to III-2-16 -0.18; pyrite next to III-2-17 +0.43; pyrite next to III-2-18 +1.30; pyrite next to III-2-19 +1.15; pyrite next to III-2-20 +1.15; pyrite next to III-2-21 +2.41; pyrite next to III-2-22 +2.41; pyrite next to III-2-23 +2.41; pyrite next to III-2-24 +2.41; pyrite next to III-2-25 +0.81; pyrite next to III-2-26 +0.81; pyrite next to III-2-27 +0.81; pyrite next to III-2-28 +0.91; pyrite next to III-2-29 +1.43; pyrite next to III-2-30 +0.97; pyrite next to III-2-31 +1.11; pyrite next to III-2-32 +0.74; pyrite next to III-2-33 +1.11; pyrite next to III-2-34 +0.79; pyrite next to III-2-35 +0.85; pyrite next to III-2-36 +1.05; pyrite next to III-2-37 +0.69). One value per electrum grain: the same pyrite may be counted several times (2.41 ‰ four times, 0.81 ‰ three times). Published mean +1.14 ‰. | Zeng et al. (2026), In-situ silver isotope analysis of Electrum and Ag2S using LA-MC-ICP-… |
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Cite this page
IsoFind Atlas (2026). Yixingzhai, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/yixingzhai/ (accessed 2026-10-22).
@misc{isofind2026yixingzhaiisotopesignatures,
title = {Yixingzhai, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/yixingzhai/},
note = {Accessed 2026-10-22}
}Updated : 2026-10-22