Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Application of pyroxene chemistry to evaluation the origin of plutonic rocks in Northeast Saveh, Urumieh–Dokhtar magmatic arc

Document Type : Original Research Paper

Authors
1 Department of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
2 School of Geology, College of Science, University of Tehran, Tehran, Iran
3 3Department of Lithospheric Research, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Vienna, Austria
4 Department of Lithospheric Research, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Vienna, Austria
5 ,Geological Survey of Iran, Tehran, Iran
10.22071/gsj.2025.533717.2210
Abstract
In this study, the chemical composition of pyroxenes (clinopyroxene and orthopyroxene) from gabbroic to monzonitic intrusive bodies in the northeast of Saveh, located in the central part of the Urumieh–Dokhtar magmatic belt, was investigated to determine the physicochemical conditions of crystallization and tectonomagmatic origin. Major and trace element analyses, performed using electron microprobe analysis, reveal that the pyroxenes in the monzonite are of augite type, while in the gabbroic units they include both augite and enstatite. Variations in Mg#, TiO₂, and Al₂O₃ in pyroxenes support a magmatic differentiation trend and progressive evolution of mantle-derived melts. Geothermobarometric calculations based on clinopyroxene compositions indicate crystallization pressures of less than 2 kbar and average crystallization temperatures of 1150–1200°C for clinopyroxene and 1100–1150°C for orthopyroxene. High oxygen fugacity and a water content of approximately 10% suggest oxidizing conditions and the presence of subduction-related fluids in shallow crustal magma chambers. Tectonic discrimination diagrams place the studied units within subduction-related and pre-collisional volcanic arc settings. These findings highlight the significant role of subduction processes and crustal melting in magma generation in northeast Saveh and provide valuable insights into the evolutionary and tectonomagmatic processes of the central segment of the Urumieh–Dokhtar magmatic arc.
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