10.57647/j.ijes.2025.1701.04

Geochemistry and technomagmatic environment of Eocene volcanic rocks in Yuzbashi Chay region, west of Qazvin (Iran)

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  • Saman Salehpour1,
  • Mohammad Ali Arian*2,
  • Alireza Jafari Rad1,
  • Reza Zarei Sahamieh3,
  • Abdollah Yazdi4,
  1. Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran
  2. Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran
  3. Department of Geology, Lorestan University, Khorramabad, Iran
  4. Department of Geology, Kahnooj Branch, Islamic Azad University, Kahnooj, Iran
Geochemistry and technomagmatic environment of Eocene volcanic rocks in Yuzbashi Chay region, west of Qazvin (Iran)

Received: 2024-02-17

Revised: 2024-05-09

Accepted: 2024-08-08

Published 2025-01-10

Copyright (c) 2025 Saman Salehpour, Mohammad Ali Arian, Alireza Jafari Rad, Reza Zarei Sahamieh, Abdollah Yazdi (Author)

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This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Salehpour, S., Arian, M. A., Jafari Rad, A., Zarei Sahamieh, R., & Yazdi, A. (2025). Geochemistry and technomagmatic environment of Eocene volcanic rocks in Yuzbashi Chay region, west of Qazvin (Iran). Iranian Journal of Earth Sciences, 17(1), 1-13. https://doi.org/10.57647/j.ijes.2025.1701.04
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Abstract

The study area is 92 km northeast of Zanjan City (Iran), north of the Tehran-Tabriz freeway. The rock units outcropped in the Zanjan quadrangle​ include the Precambrian and the Quaternary from the old to the new. However, the volcanic rocks in this vast area are of Eocene age and younger. Volcanic rocks include acidic, rhyolitic, rhyodacite, andesitic lavas, along with tuff and ignimbrite. From the mineralogical perspective, these volcanic rocks have low contents of quartz, low alkaline feldspar, and abundant plagioclase and pyroxene. In addition, porphyritic, microlithic porphyry, glomeroporphyritic, and poikilitic textures are dominant in these rocks. Geochemical studies based on oxides of major and Minor elements indicate the calc-alkaline nature of these volcanic rocks. Furthermore, studying the change trends in major, trace, and rare earth elements demonstrates a connection and affiliation between different rock groups. These rocks have formed during the subduction process and probably originate from a lower crustal source.

Keywords

  • Volcanic rocks,
  • Subduction environment,
  • West Qazvin,
  • Iran
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