Julcani

Name: Julcani, isotope signatures
Creator: IsoFind

Huancavelica, central Peru, Peru

Epithermal depositsAg-Pb-Cu-Bi

Type: Polymetallic veins related to a volcanic centre

Central Andean mining district analysed for lead by Macfarlane et al. (1990); Late Miocene polymetallic veins in Miocene volcanics and Early Palaeozoic sediments (Excelsior Group). Coordinates from Table 2, to the nearest minute. Indicative coordinates.

206Pb/204Pb isotope ratio, no unit Values of the same system

Standard : NIST SRM 981

Value	Range	n	Mineral or matrix	Source
18.545 ± 0.332	17.85 / 18.826	7	galena from polymetallic veins Mean and standard deviation recalculated from 7 samples, Table 2 (PMP-70, 71, 72, 66, 67, 60 et 75). With Toquepala, one of only two deposits then known for significant internal lead variation; according to the authors, the largest internal variation of any deposit studied. Galena from veins hosted by phyllites and volcanics; PMP-66 (17.850) stands clearly apart.	Macfarlane et al. (1990), Lead isotope provinces of the Central Andes inferred from ores …

207Pb/204Pb isotope ratio, no unit Values of the same system

Standard : NIST SRM 981

Value	Range	n	Mineral or matrix	Source
15.666 ± 0.05	15.58 / 15.733	7	galena from polymetallic veins Mean and standard deviation recalculated from 7 samples, Table 2 (PMP-70, 71, 72, 66, 67, 60 et 75). With Toquepala, one of only two deposits then known for significant internal lead variation; according to the authors, the largest internal variation of any deposit studied. Galena from veins hosted by phyllites and volcanics; PMP-66 (17.850) stands clearly apart.	Macfarlane et al. (1990), Lead isotope provinces of the Central Andes inferred from ores …

208Pb/204Pb isotope ratio, no unit Values of the same system

Standard : NIST SRM 981

Value	Range	n	Mineral or matrix	Source
38.659 ± 0.346	38.019 / 39.069	7	galena from polymetallic veins Mean and standard deviation recalculated from 7 samples, Table 2 (PMP-70, 71, 72, 66, 67, 60 et 75). With Toquepala, one of only two deposits then known for significant internal lead variation; according to the authors, the largest internal variation of any deposit studied. Galena from veins hosted by phyllites and volcanics; PMP-66 (17.850) stands clearly apart.	Macfarlane et al. (1990), Lead isotope provinces of the Central Andes inferred from ores …

Deposits of the same type

Cite this page

IsoFind Atlas (2026). Julcani, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/julcani/ (accessed 2026-10-13).

@misc{isofind2026julcaniisotopesignatures,
  title = {Julcani, isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/julcani/},
  note = {Accessed 2026-10-13}
}

Updated : 2026-10-13