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The Nature of Fluids During Pegmatite Development in Metamorphic Terrains: Evidence from Hamadan Complex, Sanandaj-Sirjan Metamorphic Zone, Iran


Affiliations
1 Shahid Beheshti University, Tehran, Iran, Islamic Republic of
2 Department of Geology, Tarbiat Moallem University, Tehran, Iran, Islamic Republic of
3 Payam Noor University, Iran, Islamic Republic of
4 School of Earth and Environment, University of Leeds, Leeds, United Kingdom
     

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In the Sanandaj-Sirjan zone of metamorphic belt of Iran, the area south of Hamadan city comprises of metamorphic rocks, granitic batholith with pegmatites and quartz veins. Alvand batholith is emplaced into metasediments of early Mesozoic age. Fluid inclusions have been studied using microthermometry to evaluate the source of fluids from which quartz veins and pegmatites formed to investigate the possible relation between host rocks of pegmatites and the fluid inclusion types. Host minerals of fluid inclusions in pegmatites are quartz, andalusite and tourmaline. Fluid inclusions can be classified into four types. Type 1 inclusions are high salinity aqueous fluids (NaCleq >12 wt%). Type 2 inclusions are low to moderate salinity (NaCleq <12 wt%) aqueous fluids. Type 3 and 4 inclusions are carbonic and mixed CO2-H2O fluid inclusions. The distribution of fluid inclusions indicate that type 1 and type 2 inclusions are present in the pegmatites and quartz veins respectively in the Alvand batholith. This would imply that aqueous magmatic fluids with no detectable CO2 were present during the crystallization of these pegmatites and quartz veins. Types 3 and 4 inclusions are common in quartz veins and pegmatites in metamorphic rocks and are more abundant in the hornfelses. The distribution of the different types of fluid inclusions suggests that CO2 fluids generated during metamorphism and metamorphic fluids might also contribute to the formation of quartz veins and pegmatites in metamorphic terrains.

Keywords

Pegmatite, CO2-H2O Fluid Inclusion, Alvand, Sanandaj-Sirjan, Iran.
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  • The Nature of Fluids During Pegmatite Development in Metamorphic Terrains: Evidence from Hamadan Complex, Sanandaj-Sirjan Metamorphic Zone, Iran

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Authors

F. Masoudi
Shahid Beheshti University, Tehran, Iran, Islamic Republic of
B. Mehrabi
Department of Geology, Tarbiat Moallem University, Tehran, Iran, Islamic Republic of
M. Rezai Aghdam
Payam Noor University, Iran, Islamic Republic of
B. W. D. Yardley
School of Earth and Environment, University of Leeds, Leeds, United Kingdom

Abstract


In the Sanandaj-Sirjan zone of metamorphic belt of Iran, the area south of Hamadan city comprises of metamorphic rocks, granitic batholith with pegmatites and quartz veins. Alvand batholith is emplaced into metasediments of early Mesozoic age. Fluid inclusions have been studied using microthermometry to evaluate the source of fluids from which quartz veins and pegmatites formed to investigate the possible relation between host rocks of pegmatites and the fluid inclusion types. Host minerals of fluid inclusions in pegmatites are quartz, andalusite and tourmaline. Fluid inclusions can be classified into four types. Type 1 inclusions are high salinity aqueous fluids (NaCleq >12 wt%). Type 2 inclusions are low to moderate salinity (NaCleq <12 wt%) aqueous fluids. Type 3 and 4 inclusions are carbonic and mixed CO2-H2O fluid inclusions. The distribution of fluid inclusions indicate that type 1 and type 2 inclusions are present in the pegmatites and quartz veins respectively in the Alvand batholith. This would imply that aqueous magmatic fluids with no detectable CO2 were present during the crystallization of these pegmatites and quartz veins. Types 3 and 4 inclusions are common in quartz veins and pegmatites in metamorphic rocks and are more abundant in the hornfelses. The distribution of the different types of fluid inclusions suggests that CO2 fluids generated during metamorphism and metamorphic fluids might also contribute to the formation of quartz veins and pegmatites in metamorphic terrains.

Keywords


Pegmatite, CO2-H2O Fluid Inclusion, Alvand, Sanandaj-Sirjan, Iran.

References