Petrology, geochemistry and tectonomagmatic setting of Zajkan granitoid, Tarom-Hashtjin sub-zone, West of Qazvin

Zajkan area as a part of Tarom-Hashjin magmatic belt contains some granitic intrusions which are intruded into the Eocene volcano-sedimentary rocks. Eocene volcano-sedimentary rocks include alternation of acidic to intermediate tuffs and lavas. Petrographical studies demonstrate that these intrusion...

Full description

Saved in:
Bibliographic Details
Published inPitruluzhī (Online) Vol. 10; no. 3; pp. 79 - 100
Main Authors Amir abbas Seyedqaraeini, Mir Ali Asghar Mokhtari, Hossein Kouhestani
Format Journal Article
LanguagePersian
Published University of Isfahan 01.11.2019
Subjects
geochemistry
granitoid
qazvin
tarom-hashtjin
zajkan
Online AccessGet full text
ISSN2228-5210
2322-2182
DOI10.22108/ijp.2020.118649.1147

Cover

More Information
Summary:Zajkan area as a part of Tarom-Hashjin magmatic belt contains some granitic intrusions which are intruded into the Eocene volcano-sedimentary rocks. Eocene volcano-sedimentary rocks include alternation of acidic to intermediate tuffs and lavas. Petrographical studies demonstrate that these intrusions composed of gabbro, pyroxene quartz monzodiorite, pyroxene quartz monzonite and granodiorite. These intrusions have high-K calc-alkaline nature and classified as I-type metaluminous granitoids. Based on the spider diagrams, these intrusions have similar patterns which are indicative for their genetic relation. These diagrams indicate enriched LILEs along with negative anomalies of HFSEs. Chondrite-normalized REE patterns demonstrate LREE enrichment with high ratio of LREE/HREE and (La/Yb)N ratio between 6.1-9.1. Based on field investigation, petrological and geochemical studies, and tectonic setting discrimination diagrams, it seems that Zajkan intrusions were formed from a subduction related metasomatized lithospheric mantle in a post-collisional setting.
ISSN:2228-5210
2322-2182
DOI:10.22108/ijp.2020.118649.1147