Geopersia

Geopersia

Mineral chemistry, U-Pb zircon ages and tectonic setting of Ariz pluton in the central Iran structural zone (Northern Bafq, Yazd province): Evidence of the Proto-Tethys subduction-related magmatism

Articles in Press

Document Type : Research Paper

Authors
Mohsen Hamidi 1
Mahmood Sadeghian 1
Masood Alipour-Asll 1
Mehdi Rezaei- Kahkhaei 1
Lambrini Papadopoulou 2
Maryam Sheibi 1
Keewook Yi 3
Hosun Lee 4
Zhai Mingguo 5
Foteini Aravani 2
1 Department of Petrology and Economic Geology, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
2 Department of Mineralogy-Petrology-Economic Geology, School of Geology, Aristotle University, Greece
3 Geochronology Team, Korea Basic Science Institute, Ochang, Republic of Korea
4 PNU Core Research Facility, Pusan National University, Busan, South Korea
5 Institute of Geology and Geophysics, Chinese Academy of Sciences (CAS), Beijing, China
10.22059/geope.2025.396749.648829
Abstract
Ariz pluton, covering approximately 65 km2, is located 50 to 65 km north of Bafq city, Yazd province, and is part of the central Iran structural zone. This pluton ranges in composition from diorite-quartzdiorite to granodiorite and is characterized by a calc-alkaline, metaluminous nature. These rocks primarily consist of hornblende, biotite, plagioclase, orthoclase and quartz. In this study, for the first time, the chemical compositions of hornblende, biotite, and feldspars are used to determine the physicochemical conditions controlling crystallization, emplacement depth, and tectonic setting. Thermobarometry based on Al-in hornblende and biotite compositions indicates that crystallization and geochemical closure occurred at pressures between 2.8-1.3 kbar and temperatures of 861-713 °C. Most of the amphiboles from the Ariz pluton are indicative of formation in a suprasubduction environment or subduction-related tectonic setting. New obtained zircon U-Pb ages indicate that the rock-forming of Ariz pluton crystallized around Late Neoproterozoic-early Cambrian boundary, representing the final product of the geological events that mainly occurred during the Late Neoproterozoic (Ediacaran). Magma-forming of Ariz pluton probably originated from partial melting of the subducted Proto-Tethys oceanic crust beneath the northern margin of Gondwana supercontinent or its above mantle wedge, during Cadomian orogeny and was emplaced in an active continental margin.
Keywords
Pluton
Thermobarometry
Proto-Tethys
Gondwana
Bafq
Ariz
Subjects

Article Title Persian

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Abstract Persian

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Geopersia

Articles in Press, Accepted Manuscript
Available Online from 09 August 2025

  • Receive Date 05 June 2025
  • Revise Date 04 August 2025
  • Accept Date 09 August 2025