Study of the petrography and tectonic settings of sills in Lavasanat district, Tehran (north of Iran)

Authors

  • Mehdi Bina Department of Geology, Faculty of Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran
  • Mohammad Ali Arian Department of Geology, Faculty of Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran
  • Mohsen Pourkermani Department of Geology, Faculty of Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran
  • Mohammad Hasan Bazoobandi Faculty of Science, University of Farhangian, Tehran, Iran
  • Abdollah Yazdi Department of Geology, Kahnooj Branch, Islamic Azad University, Kahnooj, Iran

DOI:

https://doi.org/10.5377/nexo.v33i02.10768

Keywords:

sill, tectonic setting, petrography, Lavasanat, Tectonic Setting of Sills

Abstract

The study area is located in Lavasanat District in the northeast of Tehran in Central Alborz zone. The outcrops are mainly linked to Karaj Formation, which belongs to the upper Eocene to Oligocene periods. In the study area, there are various plutonic rocks that are identified in the form of numerous dike and sill on the ground. These sills are injected in between sedimentary layers. The rocks forming the sills include the spectrum of gabbro, gabbro diorite, diorite, monzonite, and syenite. In some areas, these rocks have undergone alterations and have traces of the saussuritization and chloritization phenomena. There are also two generations of amorphous. The first generation is fully chloritized due to alteration while the second generation is unaltered. Unlike many diorites and monzonites, which typically have hornblendes, the neutral rocks such as diorite and monzonite lack hornblendes. Hence, their magmas were dry and dehydrated. Based on the geochemical studies conducted on 17 samples (15 sill samples and 2 host rock samples) and the diagrams of the tectonic settings of rocks, the study sills are in the WIN (within plate). However, two samples of the host rock are within the range of the active continental margins.

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Published

2020-12-31

How to Cite

Bina, M., Ali Arian, M., Pourkermani, M., Hasan Bazoobandi, M., & Yazdi, A. (2020). Study of the petrography and tectonic settings of sills in Lavasanat district, Tehran (north of Iran). Nexo Scientific Journal, 33(02), 286–296. https://doi.org/10.5377/nexo.v33i02.10768

Issue

Vol. 33 No. 02 (2020)

Section

Articles

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