International Geology Review, Volume (66), No (14), Year (2024-8) , Pages (2644-2671)

Title : ( New U-Pb zircon geochronological data for Takestan magmatic rocks (Western Alborz) and their significance for the interpretation of Paleogene magmatism in Iran )

Authors: Ali Asghar Sepahi Gerow , Batool Nemati , Abbas Asiabanha , David R. Lentz , Chris R. M. McFarlane ,

Citation: BibTeX | EndNote

Abstract

The Takestan area is in the western part of the Alborz magmatic arc. Magmatic rocks of the area consist of plutonic rocks (e.g. granitoids), effusive volcanic, and pyroclastic rocks. Using U-Pb zircon LA ICP-MS dating, we conclude that major parts of Takestan plutonic rocks were emplaced at 41– 39 Ma (Late Eocene, Bartonian), but a small part of these rocks have ages of ~37 Ma (Late Eocene, Priabonian). The dacitic rocks have an age of ~39 Ma (Late Eocene, Bartonian) and the rhyolitic rocks are the youngest part of the magmatic rocks of the region with ages of 37–35 Ma (Late Eocene, Priabonian). Old zircons are present in all of granitoid and volcanic samples, except for a dacitic sample. They are interpreted both as earlier components in a long-lived magma chamber and inherited zircons from older continental crust. The age of magmatic rocks in the western part of the Alborz magmatic arc decreases from east to west, but the ages of the majority of them are limited to Palaeogene. The studied rocks like other Palaeogene magmatic rocks of Iran were possibly formed in a subduction related tectonic environment. Indeed, the Palaeogene magmatism of Iran is akin to geodynamic events related to Neotethyan subduction beneath Iranian microcontinent at the southern part of Eurasia.

Keywords

Alborz magmatic arc; granitoid; Iran; Neotethyan ocean; Palaeogene
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@article{paperid:1102842,
author = {Sepahi Gerow, Ali Asghar and بتول نعمتی and عباس اسیبانها and دیوید لنتز and فرلنس},
title = {New U-Pb zircon geochronological data for Takestan magmatic rocks (Western Alborz) and their significance for the interpretation of Paleogene magmatism in Iran},
journal = {International Geology Review},
year = {2024},
volume = {66},
number = {14},
month = {August},
issn = {0020-6814},
pages = {2644--2671},
numpages = {27},
keywords = {Alborz magmatic arc; granitoid; Iran; Neotethyan ocean; Palaeogene},
}

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%0 Journal Article
%T New U-Pb zircon geochronological data for Takestan magmatic rocks (Western Alborz) and their significance for the interpretation of Paleogene magmatism in Iran
%A Sepahi Gerow, Ali Asghar
%A بتول نعمتی
%A عباس اسیبانها
%A دیوید لنتز
%A فرلنس
%J International Geology Review
%@ 0020-6814
%D 2024

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