The role of adakitic magmatism and crustal thickening with copper mineralization in the Chah-Firouzeh porphyry, Kerman porphyry copper belt

Document Type : Original Article

Authors

1 Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, Iran

2 Department of Earth Sciences, Faculty of Earth Sciences, Shiraz University, Shiraz, Iran

10.22128/ijcm.2025.3020.1001

Abstract

The Chah-Firoozeh porphyry Cu deposit, located 32 km north of Shahr-e Babak (Kerman belt), Iran, hosts 379 Mt grading 0.25% Cu. Mineralization occurs within a granitoid stock (quartz diorite to quartz monzodiorite) intruding andesitic rocks. Primary mineralization comprises pyrite, chalcopyrite, bornite, and magnetite in stockwork and disseminated textures. Geochemically, the porphyry shows LILE enrichment and HFSE/HREE depletion. High Sr/Y ratios, low Y, and a negative Nb anomaly confirm an adakitic signature with crustal contamination. Type I adakitic granitoid affinity is indicated by La/Yb > 20, a positive Eu anomaly, Sr/Y > 30, and specific [La]ₙ/[Yb]ₙ - [Yb]ₙ ratios. Batch melting models suggest 3–10% garnet in the residue and crustal thickening (~45 km). These geochemical features indicate Cu mineralization formed in a syn- to post-collisional setting, derived from juvenile mafic lower-crust within thickened lithosphere at the study area.

Keywords



Articles in Press, Accepted Manuscript
Available Online from 25 October 2025
  • Receive Date: 22 August 2025
  • Revise Date: 01 October 2025
  • Accept Date: 25 October 2025