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Mineralogy and Petrology

, 94:107 | Cite as

Chemical characteristics and composition of hydrothermal biotite from the Dalli porphyry copper prospect, Arak, central province of Iran

  • F. Ayati
  • F. YavuzEmail author
  • M. Noghreyan
  • H. A. Haroni
  • R. Yavuz
Original Paper

Abstract

The Dalli porphyry copper deposit is hosted by the Miocene–Pliocene subvolcanic plutons with chemical composition from diorite to granodiorite that intruded into the andesitic and dacitic volcanic rocks and variety of sedimentary sequences within the Urumieh–Dokhtar Magmatic Arc. Three main hydrothermal alteration zones including potassic, phyllic and propylitic types have been described in the volcano-plutonic rocks. Early hydrothermal alteration started with potassic style in the central part of system produced a secondary biotite–K-feldspar–magnetite assemblage and accompanies to chalcopyrite and pyrite mineralization. This paper summarizes the detailed biotite mineral chemistry from the potassic and phyllic alteration zones. The FeO, TiO2, MnO, K2O, and Na2O (wt.%) concentrations of biotite from the phyllic alteration zone are lower than biotite from the potassic alteration zone. The F and Cl (wt.%) contents of biotite from the potassic alteration zone display relatively high positive correlation with the X Mg. The fluorine intercept values [IV (F)] from the potassic and phyllic alteration zones are strongly positively correlated with the fluorine/chlorine intercept values [IV (F/Cl)]. Biotite geothermometry for the potassic and phyllic alteration zones yield a range from 402° to 450°C and 280° to 343°C, respectively at Dalli porphyry copper deposit. The scatter in log (X F/X OH) ratios vs. X Mg and X Fe plots also reflects the evidence of biotite formed under dissimilar composition and temperature conditions in the potassic and phyllic alteration zones. Calculated log fugacity ratios of (fH2O/fHF), (fH2O/fHCl), and (fHF/fHCl) show that hydrothermal fluids associated with the potassic alteration were distinctively different from fluids those associated with the phyllic alteration zone at Dalli porphyry copper deposit. The relation between log (fH2O/fHCl) and log (fH2O/fHF) fugacity ratios indicates that biotite from the Dalli volcano-plutonic rocks is distinctly similar to biotite from the porphyry copper deposit at Bingham.

Keywords

Hydrothermal Fluid Copper Deposit Alteration Zone Porphyry Copper Deposit Potassic Alteration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study forms the part of a PhD research of senior author carried out by the adviser of HA Haroni at Isfahan University, Iran. The authors thank the staff of office of graduate studies at Isfahan University for their supports. We would like to express our appreciation to Dr. M. Khalili, Department of Geology, Isfahan University for his valuable suggestions. Special thanks are due to Dr. M. A. Mackizadeh for his hospitality and patient guidance at his mining company during the field studies. Saeed Mahdevari at Department of Mining, Isfahan University of Technology, is thanked for his helpful comments and continued friendship. This paper benefited from the valuable comments and suggestions of two anonymous referees. We are grateful to Dr. Anton Beran for his editorial handling.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • F. Ayati
    • 1
  • F. Yavuz
    • 2
    Email author
  • M. Noghreyan
    • 1
  • H. A. Haroni
    • 3
  • R. Yavuz
    • 4
  1. 1.Department of GeologyIsfahan UniversityIsfahanIran
  2. 2.Jeoloji Mühendisliği Bölümüİstanbul Teknik ÜniversitesiİstanbulTurkey
  3. 3.Department of MiningIsfahan University of TechnologyIsfahanIran
  4. 4.Kimya Mühendisliği Bölümüİstanbul Teknik ÜniversitesiİstanbulTurkey

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