Sinongduo
Tibet, Xietongmen County (Longge'er-Gongbujiangda arc-fault belt, Lhasa terrane), China
Epithermal depositsAg, Pb, Zn
- Type
- Low-sulfidation epithermal Ag-Pb-Zn in Paleocene volcanic rocks
First low-sulfidation epithermal described in Tibet: Ag-rich veins, breccias and stockworks in the potassic rhyolitic volcanic rocks of the Dianzhong Formation (65-62 Ma), controlled by a north-south fault; more than 0.35 Mt Pb + Zn at more than 5 % and more than 500 t Ag at more than 50 g/t. Galena and sphalerite dominant, argentite, pyrargyrite, pearceite and native silver; sericite 40Ar/39Ar ages of 63.1 ± 0.7 and 60.9 ± 0.7 Ma. Meteoric fluids (δD from -177 to -151 ‰), Pb and S from the host volcanic rocks (Li et al., 2019). Coordinates not published.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 5 ± 0.6 ‰ | 4.1 / 5.6 ‰ | 7 | galena of the galena, sphalerite and silver substages Mean and standard deviation recalculated from 7 analyses, +4.1 to +5.6 (BZK1301-253.61 +5.6; BZK0-2-55.54 +5.1; BZK1106-137.48 +4.3; BZK0703-246.9 +5.2; BZK0301-182.8 +5.4; BZK1301-211.35 +5.0; bzk0901-174.37 +4.1). Published mean +5.0 ‰. Equilibrium sphalerite-galena pairs: 278, 267, 229, 237 and 190 °C (Ohmoto and Rye, 1979). | Li et al. (2019), Fluid inclusions, isotopic characteristics and geochronology of the Sin… |
| 8.1 ± 0.3 ‰ | 7.6 / 8.4 ‰ | 5 | sphalerite of the galena, sphalerite and silver substages Mean and standard deviation recalculated from 5 analyses, +7.6 to +8.4 (BZK1301-253.61 +8.0; BZK0-2-55.54 +7.6; BZK0703-246.9 +8.1; BZK0301-182.8 +8.2; BZK1301-211.35 +8.4). Published mean +8.1 ‰. Equilibrium sphalerite-galena pairs: 278, 267, 229, 237 and 190 °C (Ohmoto and Rye, 1979). | Li et al. (2019), Fluid inclusions, isotopic characteristics and geochronology of the Sin… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 7.1 ± 2 ‰ | 3.4 / 9.1 ‰ | 6 | main-stage (II) quartz Mean and standard deviation recalculated from 6 analyses, +3.4 to +9.1 (BZK0301-182.8 +9.1; BZK0901-174.37 +7.0; BZK1106-137.48 +3.4; TD41-10 +6.6; BZK0703-246.9 +7.7; TD024-3 +8.5). Fluid δ18O (‰): BZK0301-182.8 -0.6; BZK0901-174.37 -2.7; BZK1106-137.48 -6.3; TD41-10 -3.1; BZK0703-246.9 -2.0; TD024-3 -1.2. Stage III (Fu et al., 2017, not entered): fluid -8.3 and -7.1 ‰. | Li et al. (2019), Fluid inclusions, isotopic characteristics and geochronology of the Sin… |
δD in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −168 ± 10 ‰ | −177 / −151 ‰ | 5 | fluid-inclusion water in stage II quartz Mean and standard deviation recalculated from 5 analyses, -177 to -151 (BZK0301-182.8 -151; BZK0901-174.37 -171; BZK1106-137.48 -165; BZK0703-246.9 -177; TD024-3 -174). Little-modified meteoric water, shifted in δ18O by interaction with the volcanic rocks according to the authors; TD41-10 has no δD. | Li et al. (2019), Fluid inclusions, isotopic characteristics and geochronology of the Sin… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.5738 ± 0.0029 | 18.5684 / 18.5792 | 12 | galena and sphalerite Mean and standard deviation recalculated from 12 analyses, 18.5684 to 18.5792 (BZK1301-253.61 (Sp) 18.5745; BZK1301-253.61 (Gn) 18.5742; BZK0-2-55.54 (Sp) 18.5722; BZK0-2-55.54 (Gn) 18.5748; BZK1106-137.48 (Gn) 18.5769; BZK0703-246.9 (Sp) 18.5740; BZK0703-246.9 (Gn) 18.5684; BZK0301-182.8 (Sp) 18.5792; BZK0301-182.8 (Gn) 18.5759; BZK1301-211.35 (Sp) 18.5707; BZK1301-211.35 (Gn) 18.5714; bzk0901-174.37 (Gn) 18.5730). µ from 9.64 to 9.65 (calculated at 62 Ma). | Li et al. (2019), Fluid inclusions, isotopic characteristics and geochronology of the Sin… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.7021 ± 0.0024 | 15.6987 / 15.7056 | 12 | galena and sphalerite Mean and standard deviation recalculated from 12 analyses, 15.6987 to 15.7056 (BZK1301-253.61 (Sp) 15.7000; BZK1301-253.61 (Gn) 15.6998; BZK0-2-55.54 (Sp) 15.7006; BZK0-2-55.54 (Gn) 15.7054; BZK1106-137.48 (Gn) 15.7049; BZK0703-246.9 (Sp) 15.7056; BZK0703-246.9 (Gn) 15.6987; BZK0301-182.8 (Sp) 15.7034; BZK0301-182.8 (Gn) 15.7035; BZK1301-211.35 (Sp) 15.6996; BZK1301-211.35 (Gn) 15.7017; bzk0901-174.37 (Gn) 15.7021). µ from 9.64 to 9.65 (calculated at 62 Ma). | Li et al. (2019), Fluid inclusions, isotopic characteristics and geochronology of the Sin… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 39.1675 ± 0.0054 | 39.1597 / 39.1765 | 12 | galena and sphalerite Mean and standard deviation recalculated from 12 analyses, 39.1597 to 39.1765 (BZK1301-253.61 (Sp) 39.1671; BZK1301-253.61 (Gn) 39.1653; BZK0-2-55.54 (Sp) 39.1628; BZK0-2-55.54 (Gn) 39.1737; BZK1106-137.48 (Gn) 39.1734; BZK0703-246.9 (Sp) 39.1765; BZK0703-246.9 (Gn) 39.1597; BZK0301-182.8 (Sp) 39.1712; BZK0301-182.8 (Gn) 39.1694; BZK1301-211.35 (Sp) 39.1609; BZK1301-211.35 (Gn) 39.1643; bzk0901-174.37 (Gn) 39.1651). µ from 9.64 to 9.65 (calculated at 62 Ma). | Li et al. (2019), Fluid inclusions, isotopic characteristics and geochronology of the Sin… |
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Cite this page
IsoFind Atlas (2026). Sinongduo, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/sinongduo/ (accessed 2026-10-21).
@misc{isofind2026sinongduoisotopesignatures,
title = {Sinongduo, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/sinongduo/},
note = {Accessed 2026-10-21}
}Updated : 2026-10-21