Cerro Vanguardia
Santa Cruz (Deseado Massif, Patagonia), Argentina
Epithermal depositsAu-Ag
- Type
- Low-sulphidation epithermal Au-Ag (Jurassic)
Gold- and silver-rich quartz-adularia veins; pyrite-rich layers containing electrum. Tassara et al. (2022, supplement): Re-Os pyrite isochron at 147.4 ± 2.9 Ma (n = 8, MSWD 1.04), initial 187Os/188Os of 0.26 ± 0.01. Only the paper's supplement was read.
187Os/188Os isotope ratio, no unit Values of the same system
Standard : Rapport absolu, sans standard de référence
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.258 ± 0.009 | 0.246 / 0.273 | 8 | pyrite from gold veins, initial ratio at 147 Ma Mean and standard deviation recalculated from 8 analyses, 0.246 to 0.273 (Py4 0.261; Py7 0.255; Py15 0.273; Py16 0.247; Py17 0.268; Py19 0.246; Py13 0.256; Py20 0.254). Present-day ratios 0.44 to 1.44 for 187Re/188Os of 78 to 488; Re 0.25 to 0.56 ng/g, Os 5.7 to 21.2 pg/g. Homogeneous, unradiogenic initials: the authors see a mantle source for osmium. | Tassara et al. (2022), Osmium isotopes fingerprint mantle controls on the genesis of an e… |
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Cite this page
IsoFind Atlas (2026). Cerro Vanguardia, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/cerro-vanguardia/ (accessed 2026-10-21).
@misc{isofind2026cerrovanguardiaisotopesignatu,
title = {Cerro Vanguardia, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/cerro-vanguardia/},
note = {Accessed 2026-10-21}
}Updated : 2026-10-21