Sierra Mojada District
Coahuila, margin of the Coahuila Block, Mexico
Carbonate replacementZn-Pb-Ag
- Type
- Polymetallic carbonate replacement and supergene nonsulfide zinc deposits
Hypogene Fe-Zn-Pb-Cu-Ag sulfides and sulfosalts (about 200 °C) replacing Lower Cretaceous carbonates, oxidised into nonsulfide deposits: the White Zinc Zone (smithsonite) and the Red Zinc Zone (hemimorphite in iron oxides), and a silver-rich lead carbonate manto. Smithsonite formed at about 26 to 35 °C; supergene mobilisation ended with Holocene aridification. Indicative coordinates.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 7.7 ± 1.27 ‰ | 6.8 / 8.6 ‰ | 2 | polymetallic manto pyrite Mean and standard deviation recalculated from 2 samples, Table 1. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 8.8 ‰ | 1 | polymetallic manto sphalerite One analysis, Table 1. Sphalerite-galena pair: Δ34S of 3.1 ‰, about 190 °C. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… | |
| 6.27 ± 4.93 ‰ | 1.7 / 11.5 ‰ | 3 | galena, positive mode (polymetallic manto and Veta Rica) Mean and standard deviation recalculated from 3 samples, Table 1. Bimodal sulfide distribution, at about -12 ‰ and +6 to +8 ‰. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| −12.3 ± 0.99 ‰ | −13 / −11.6 ‰ | 2 | galena, negative mode (Dormitos and Veta Rica) Mean and standard deviation recalculated from 2 samples, Table 1. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 15.8 ‰ | 1 | Veta Rica barite One analysis, Table 1. Barite-galena pair at about 180 °C. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… | |
| 16.75 ± 0.07 ‰ | 16.7 / 16.8 ‰ | 2 | evaporitic anhydrite of the Acatita Formation (Albian-Aptian, regional reference) Mean and standard deviation recalculated from 2 samples, Table 1. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 3.5 ± 0.42 ‰ | 3.2 / 3.8 ‰ | 2 | host limestone (Aurora?) Mean and standard deviation recalculated from 2 analyses, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| −6.31 ± 0.66 ‰ | −7.2 / −5.3 ‰ | 9 | late White Zinc Zone calcite (fractures, speleothem, crystals on smithsonite) Mean and standard deviation recalculated from 9 analyses, Table 2. The text reports 8 calcites, the table lists 9. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| −6.72 ± 1.98 ‰ | −8.5 / −3.9 ‰ | 4 | Red Zinc Zone and Aurora dolomite calcite Mean and standard deviation recalculated from 4 analyses, Table 2. SM03-1 (dolomite pore) included, as in the published mean. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 0.35 ± 0.7 ‰ | −0.3 / 1.1 ‰ | 4 | type A smithsonite (unzoned scalenohedra) Mean and standard deviation recalculated from 4 analyses, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| −1.94 ± 1.94 ‰ | −8.4 / 1 ‰ | 27 | type B smithsonite (colloform) Mean and standard deviation recalculated from 27 analyses, Table 2. Several bands of a single sample; smithsonite formed at about 26 to 35 °C (water at -8 ‰). | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| −6.3 ‰ | 1 | lead carbonate manto cerussite One analysis, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 24 ‰ | 24 / 24 ‰ | 2 | host limestone (Aurora?) Mean and standard deviation recalculated from 2 analyses, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 21.52 ± 0.62 ‰ | 20.2 / 22.2 ‰ | 9 | late White Zinc Zone calcite (fractures, speleothem, crystals on smithsonite) Mean and standard deviation recalculated from 9 analyses, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 21.5 ± 0.71 ‰ | 20.5 / 22.1 ‰ | 4 | Red Zinc Zone and Aurora dolomite calcite Mean and standard deviation recalculated from 4 analyses, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 21.45 ± 0.24 ‰ | 21.1 / 21.6 ‰ | 4 | type A smithsonite (unzoned scalenohedra) Mean and standard deviation recalculated from 4 analyses, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 22 ± 0.5 ‰ | 20.9 / 23.3 ‰ | 27 | type B smithsonite (colloform) Mean and standard deviation recalculated from 27 analyses, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 12.5 ‰ | 1 | lead carbonate manto cerussite One analysis, Table 2. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.683 ± 0.023 | 18.634 / 18.7 | 7 | hypogene galena (Veta Rica, polymetallic manto, Dormitos) Mean and standard deviation recalculated from 7 samples, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 18.746 ± 0.088 | 18.693 / 18.847 | 3 | White Zinc Zone smithsonite Mean and standard deviation recalculated from 3 samples, Table 3. SM09-9 (206Pb/204Pb of 18.847) departs from the rest; the text attributes the outlier to a distal galena. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 18.692 | 1 | lead carbonate manto cerussite One analysis, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… | |
| 18.68 | 1 | Red Zinc Zone hemimorphite One analysis, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.644 ± 0.01 | 15.631 / 15.662 | 7 | hypogene galena (Veta Rica, polymetallic manto, Dormitos) Mean and standard deviation recalculated from 7 samples, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 15.634 ± 0.004 | 15.629 / 15.637 | 3 | White Zinc Zone smithsonite Mean and standard deviation recalculated from 3 samples, Table 3. SM09-9 (206Pb/204Pb of 18.847) departs from the rest; the text attributes the outlier to a distal galena. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 15.647 | 1 | lead carbonate manto cerussite One analysis, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… | |
| 15.627 | 1 | Red Zinc Zone hemimorphite One analysis, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.563 ± 0.044 | 38.495 / 38.633 | 7 | hypogene galena (Veta Rica, polymetallic manto, Dormitos) Mean and standard deviation recalculated from 7 samples, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 38.517 ± 0.03 | 38.482 / 38.536 | 3 | White Zinc Zone smithsonite Mean and standard deviation recalculated from 3 samples, Table 3. SM09-9 (206Pb/204Pb of 18.847) departs from the rest; the text attributes the outlier to a distal galena. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
| 38.575 | 1 | lead carbonate manto cerussite One analysis, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… | |
| 38.512 | 1 | Red Zinc Zone hemimorphite One analysis, Table 3. | Kyle et al. (2018), Nature and origin of the nonsulfide zinc deposits in the Sierra Mojad… |
Deposits of the same type
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Cite this page
IsoFind Atlas (2026). Sierra Mojada District, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/district-de-sierra-mojada/ (accessed 2026-10-13).
@misc{isofind2026sierramojadadistrictisotopesi,
title = {Sierra Mojada District, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/district-de-sierra-mojada/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13