Zakeri Leila

University of Tabriz

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Mohssen Moazzen

University of Tabriz

Farhad Malek-Ghasemi

University of Tabriz

Ahmad Jahangiri

University of Tabriz

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University of Tabriz

Institute for Research in Fundamental Sciences

University of Central Asia

Academy of Sciences of the Republic of Tajikistan

University of Wollongong

Tarbiat Modares University

Malteser-Krankenhaus

Freie Universität Berlin

University of Manchester

University of Potsdam

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Metallogenic implications of biotite chemical composition: Sample from Cu-Mo-Au mineralized granitoids of the Shah Jahan Batholith, NW Iran

Central European Geology (2011)

Zakeri Leila Farhad Malek-Ghasemi Ahmad Jahangiri Mohssen Moazzen

Igneous biotite has been analyzed from three I-type calc-alkaline intrusives of the Shah Jahan Batholith in NW Iran, which host several Cu-Mo-Au prospects.The X Mg (Mg/Mg+Fe) value of biotite is the most significant chemical factor and the relatively high value of X Mg corresponds to relatively high oxidation states of magma (estimated ƒ O2 is mostly 10 -12.5 to 10 -7.5 bars), which is in good agreement with their host intrusions' setting and related ore occurrences.Based on criteria of Al IV and Al VI values, all studied biotites are primary (Al VI = 0), and based on Al total values (2.23-2.82apfu) are in distinctive ranges of mineralized granitoid (Al total =3.2 apfu).The maximum F content of biotite from the Shah Jahan intrusions is moderately higher than those from some other calc-alkaline intrusions related to Cu-Mo porphyries in the world, and in contrast, Cl content is relatively lower.It is likely a result of primary magmatic vs. secondary hydrothermal origin, as well as the Mg-rich characteristics of the biotite in Shah Jahan.X Mg values do not correlate with F and Cl contents of biotite, suggesting that biotite records changes in the F/OH and Cl/OH ratios in coexisting melt/fluids.It is consistent with F-compatible and Cl-incompatible behavior during fractional crystallization of wet calc-alkaline I-type granitoid magma generated at subduction related arc settings.The fugacity ratios of (H 2 O/HF), (H 2 O/HCl) and (HF/HCl) magmatic solutions coexisting with biotite illustrate similar trends in the three intrusions, which can be due to parental magma sources and/or indicate occurrence of similar magmatic processes prior to or contemporaneous with exsolution of fluids from melt.The observed trends caused F-depletions and Cl-enrichments within developed magmatic-hydrothermal systems which are one of the essential characteristics of potential Cu-Mo-Au mineralized I-type granitoids.

Batholith

10.1556/ceugeol.54.2011.3.5

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