Genesis of the Hahlar Metasediment-Hosted Cu-Pb (+/- Zn) Mineralization, NW Turkey: Evidence from Mineralogy, Alteration, and Sulfur Isotope Geochemistry


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Yildirim D. K.

MINERALS, vol.12, no.8, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 8
  • Publication Date: 2022
  • Doi Number: 10.3390/min12080991
  • Journal Name: MINERALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, ABI/INFORM, Aerospace Database, CAB Abstracts, Communication Abstracts, INSPEC, Metadex, Directory of Open Access Journals, Civil Engineering Abstracts
  • Keywords: mass-balance calculations, delta S-34 data, Cu-Pb (+/- Zn) mineralization, Hahlar, NW Turkey, PORPHYRY COPPER-DEPOSIT, ILMENITE-SERIES GRANITOIDS, HYDROTHERMAL ALTERATION, MAGNETITE-SERIES, HYDROGEN ISOTOPE, VOLCANIC-ROCKS, EL-SALVADOR, OXYGEN, SYSTEMATICS, EVOLUTION
  • Istanbul Technical University Affiliated: Yes

Abstract

This study contributes to our understanding of the evolution of Hahlar Cu-Pb (+/- Zn) mineralization (NW Turkey) based on mineralogical and geochemical results and sulfur isotope data. The study area represents local Cu-Pb with some Zn brecciated-stockwork vein type mineralization along the NE-SW fault gouge zone at the lower boundary of the Sakarkaya and Durtarla granitoid rocks. Two main zones, consisting of sericite-quartz-chlorite +/- kaolinite +/- pyrite (i.e., zone-1) and calcite-epidote-albite +/- chlorite +/- sericite (i.e., zone-2), were observed within the central ore mineral zone at the mining site. Different mineralization assemblages were recorded; the main ore mineral contains chalcopyrite, galena, pyrite, and sphalerite within alteration zone-1, and the oxidation/supergene mineralization includes covellite and goethite. The mass balance calculations show that the samples of zone-1 show an increase in SiO2, Fe2O3, K2O, and LOT along with Ag, As, Cu, Mo, Pb, S, Sb, and Zn, reflecting high pyritization with sericitization and silicification. On the other hand, the samples from zone-2 are rich in CaO; Na2O; P2O5; TiO2; LOT; and carbonreflecting calcite, epidote, and albite alterations. A uniform magmatic sulfur source of Hahlar sulfides is suggested by their mean 6 delta S-34 value of -1.62 parts per thousand. Furthermore, the primary metal source is metasediments and intrusive Durtarla granitoid magmatism. These observations suggest that the Hahlar metasediment-hosted Cu-Pb (+/- Zn) mineralization was formed by epigenetic hydrothermal processes after sedimentation/diagenesis and metamorphism.