Contrasting mineralized and barren porphyries in the Zhongdian Arc, insights from biotite and apatite compositions and halogen fugacity.

ABSTRACT: Copper mineralization in the Pulang (PL) porphyry deposit, Langdu (LD) porphyry-skarn deposit and Songnuo (SN) porphyry prospect in northwestern Yunnan, China, is closely related to the emplacement of quartz monzonite porphyries. The chemical compositions of biotite and apatite from those porphyries were analyzed to calculate the halogen fugacity and to constrain mineralized and barren porphyries. Our data show that biotites from the PL deposit have higher MgO, SiO₂, TiO₂ and F contents than those from the LD deposit or SN prospect. Compared to those in the LD deposit and SN prospect, the Mg (atoms per formula unit (apfu)) and Al^VI (apfu) value in biotite is greater, and the F content is greater and the SO₃ and Ce₂O₃/Y₂

SUBMITTER: Pan Y 

PROVIDER: S-EPMC11637034 | biostudies-literature | 2024 May

REPOSITORIES: biostudies-literature