Geochemistry of siliciclastic rocks from the Shemshak Group (Upper Triassic–Middle Jurassic), northeastern Alborz, northern Iran: implications for palaeoweathering, provenance, and tectonic setting

Authors

  • Azizollah Taheri Shahrood University of Technology, Department of Geosciences, Shahrood, Iran
  • Mahdi Jafarzadeh Shahrood University of Technology, Department of Geosciences, Shahrood, Iran
  • John Armstrong-Altrin Universidad Nacional Autónoma de México, Unidad de Procesos Oceánicos y Costeros, Instituto de Ciencias del Mar y Limnología, Ciudad Universitaria, Ciudad de México 04510, México
  • Seyyed Reza Mirbagheri Shahrood University of Technology, Department of Geosciences, Shahrood, Iran

DOI:

https://doi.org/10.7306/gq.1433

Keywords:

Shemshak Group, geochemistry, provenance, palaeoweathering, tectonic setting, Neotethys

Abstract

Combined petrographic and geochemical data of the siliciclastic sedimentary rocks from the Shemshak Group in the northeastern Alborz Mountains, north of Iran are described, together with their implications for palaeoweathering, their provenance, and tectonic setting. Based on field observations and modal composition, the sandstones are classified as litharenites. The chemical index of alteration (CIA) indicated that the source terrains underwent a moderate intensity of chemical weathering. The index of chemical variation (ICV) values indicated that the Shemshak Group rocks were immature and related to a source area with an active tectonic regime. Major, trace and rare earth element (REE) data suggested the domination of mixed sedimentary (recycled) and igneous rocks in the source area of the Shemshak Group. Petrographic and geochemical characteristics of Shemshak Group rocks suggest an active continental margin (ACM), which corresponds to the collision of the Iran plate with the Turan plate.

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Published

2018-10-24

Issue

Vol. 62 No. 3 (2018)

Section

Articles

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