Crescencia

Aragon (Huesca), Axial Zone of the Central Pyrenees, Spain

Other hydrothermalNi (U)

Type

Hydrothermal Co-Ni arsenides and sulpharsenides

Axial Zone of the Spanish Central Pyrenees (Huesca and Lleida), Co-Ni arsenide, diarsenide and sulpharsenide deposits in the hanging wall of thin-skinned thrusts (Gavarnie nappe, Nogueras thrust sheets), footwall of Variscan black shales; formed between 300 and 600 °C. Sm-Nd age of ore-stage ankerites of 86 ± 27 Ma (Late Cretaceous), coeval with Pyrenean high-temperature low-pressure metamorphism, mantle exhumation and alkaline magmatism. Fluid of magmatic origin masked by interaction with black shales and carbonates, sulphur and metals leached from the Variscan basement and the underlying black shales according to Manuel et al. (2018). Nickel showing: E-W vein 50 m long and 10 cm wide at the contact between dolomitised limestones and Early Devonian black shales, disseminated mineralisation in the selvages; nickeline and pararammelsbergite (stage I), gersdorffite (stage II), uraninite (stage III, U-Pb chemical ages of 135 to 70 Ma, mean 98 ± 18 Ma); cut by an Alpine E-W thrust. Coordinates from Mindat (Crescencia or Pico Gallinero mine, Castejón de Sos).

@misc{isofind2026crescenciaisotopesignatures,
  title = {Crescencia, isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/crescencia/},
  note = {Accessed 2026-10-15}
}

Updated : 2026-10-15