Baguamiao
Fengtai basin, Feng County, Shaanxi (Qinling), China
Orogenic goldAu
- Type
- Sediment-hosted gold (ankerite phyllites) along a shear zone
Giant gold deposit in spotted-ankerite silty phyllites of the Upper Devonian Xinghongpu Formation, within the Baguamiao-Shuangwang ductile-brittle shear zone. Authors' model: Devonian hydrothermal sedimentation reworked by Indosinian and Yanshanian magmatic fluids; gold concentrates in quartz veins of late NE-trending joints. Coordinates of Feng County. Indicative coordinates.
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −2.43 ± 0.83 ‰ | −4.87 / −1.85 ‰ | 12 | rock and ore ankerite and calcite Mean and standard deviation recalculated from 12 samples, Table 1 (Zheng et al., 1994): rock ankerites (2), rock calcite (-4.87/16.64 ‰), vein (2) and ore ankerites (7). Deep CO2 according to the authors, close to mantle carbonates. | Guo et al. (2000), Ore-forming and exploration models of the Baguamiao gold deposit, Shaa… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 19.14 ± 0.85 ‰ | 16.64 / 19.73 ‰ | 12 | rock and ore ankerite and calcite Mean and standard deviation recalculated from 12 samples, Table 1 (Zheng et al., 1994): rock ankerites (2), rock calcite (-4.87/16.64 ‰), vein (2) and ore ankerites (7). Deep CO2 according to the authors, close to mantle carbonates. | Guo et al. (2000), Ore-forming and exploration models of the Baguamiao gold deposit, Shaa… |
| 15.69 ± 4.64 ‰ | 5.69 / 20.39 ‰ | 9 | vein quartz Mean and standard deviation recalculated from 9 samples, Table 1 (Northwest Nonferrous Geological Institute, 1992); calculated fluid -3.07 to 13.3 ‰ between 180 and 364 °C. The text gives a 15.69 ‰ mean. | Guo et al. (2000), Ore-forming and exploration models of the Baguamiao gold deposit, Shaa… |
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 12.3 ‰ | 9.5 / 15.4 ‰ | ore sulfides Published summary, range and mean from the text, number not given. Host rocks: 4.1 to 15.0 ‰, mean 11.4 ‰. Heavy sulfur attributed to the deep crust. | Guo et al. (2000), Ore-forming and exploration models of the Baguamiao gold deposit, Shaa… |
δ30Si in ‰ (per mil) Values of the same system
Standard : NBS 28
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.06 ‰ | −0.2 / 0.1 ‰ | 5 | NE-joint vein quartz (late mineralisation) Published summary, five samples, mean and range from the text (Fig. 1). Close to the magmatic rocks: magmatic silicon for the late gold-rich stage (mean Au 14.8 g/t). | Guo et al. (2000), Ore-forming and exploration models of the Baguamiao gold deposit, Shaa… |
| −0.33 ‰ | −0.4 / −0.3 ‰ | 3 | interlayer vein quartz (early mineralisation) Published summary, three samples, mean and range from the text. Shuangwang and Qingyadonggou albitites -0.4 to -0.2 ‰ (mean -0.32, n = 5); Indosinian granodiorite -0.3 to -0.1 ‰ (-0.16, n = 3); Yanshanian granite porphyry -0.1 to 0.3 ‰ (0.13, n = 3). | Guo et al. (2000), Ore-forming and exploration models of the Baguamiao gold deposit, Shaa… |
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Cite this page
IsoFind Atlas (2026). Baguamiao, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/baguamiao/ (accessed 2026-10-13).
@misc{isofind2026baguamiaoisotopesignatures,
title = {Baguamiao, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/baguamiao/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13