Colquijirca
Pasco, central Peru, Peru
Epithermal depositsCu-Zn-Pb-Ag (Au)
- Type
- Epithermal Cu-Zn-Pb-Ag linked to a Miocene diatreme
Epithermal Cu-Au (Marcapunta) and Zn-Pb-Ag carbonate-replacement deposit around a Miocene diatreme-dome complex; intermediate- to high-sulphidation evolution, main enargite ore stage. Saintilan et al. (2021): pyrite initial Os radiogenic (1.34 to 1.45), enargite highly variable (0.13 to 1.24), read as unradiogenic magmatic Os mixed with Os leached from Devonian shales. Coordinates: mean of the Table 1 samples (UTM 18S) converted to degrees.
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 |
|---|---|---|---|---|
| 1.41 ± 0.05 | 1.34 / 1.45 | 4 | main-stage pyrite, initial ratio (age 10.8-10.6 Ma) Mean and standard deviation recalculated from 4 analyses, 1.34 to 1.45 (CO-5-Py-a 1.34; CO-5-Py-b 1.41; CO-5-Py-c 1.45; CO-5-Py-d 1.45). Present-day ratios: CO-5-Py-a 1.46 (187Re/188Os 641, Os 15.1 ppt); CO-5-Py-b 1.53 (187Re/188Os 669, Os 15 ppt); CO-5-Py-c 1.61 (187Re/188Os 673, Os 13.4 ppt); CO-5-Py-d 1.62 (187Re/188Os 684, Os 12.6 ppt). | Saintilan et al. (2021), Osmium isotopic constraints on sulphide formation in the epither… |
| 0.83 ± 0.53 | 0.13 / 1.24 | 6 | main-stage enargite, initial ratio (age 10.8-10.6 Ma) Mean and standard deviation recalculated from 6 analyses, 0.13 to 1.24 (CO-1-Ena-a 1.23; CO-1-Ena-b 1.24; CO-4-Ena-a 1.10; CO-4-Ena-b 1.11; CO-5-Ena-a 0.13; CO-5-Ena-b 0.17). Present-day ratios: CO-1-Ena-a 1.40 (187Re/188Os 687, Os 5.4 ppt); CO-1-Ena-b 1.39 (187Re/188Os 677, Os 4.7 ppt); CO-4-Ena-a 1.11 (187Re/188Os 36, Os 22.9 ppt); CO-4-Ena-b 1.11 (187Re/188Os 37, Os 24.4 ppt); CO-5-Ena-a 0.13 (187Re/188Os 1.4, Os 673 ppt); CO-5-Ena-b 0.17 (187Re/188Os 12, Os 77 ppt). | Saintilan et al. (2021), Osmium isotopic constraints on sulphide formation in the epither… |
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Cite this page
IsoFind Atlas (2026). Colquijirca, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/colquijirca/ (accessed 2026-10-21).
@misc{isofind2026colquijircaisotopesignatures,
title = {Colquijirca, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/colquijirca/},
note = {Accessed 2026-10-21}
}Updated : 2026-10-21