Petrological Journal

Petrography, Geochemistry and Tectonic Setting of the Harris Granite Body, Located in Mishu Mountains, Northwest of Iran (Shabestar City)

Farhad Pirmohammadi Alishah

Volume 12, Issue 3 , December 2021, , Pages 81-100

https://doi.org/10.22108/ijp.2022.131116.1256

Abstract

The Harris granitoid body, as a part of Alborz-Azarbaijan zone, located in the northwestern Iran and west of Shabestar city. The intrusive body cut the Kahar formation and covered by ... Read More

Petrogenesis of post-collisional Plio-Quaternary adakitic rocks in south of Tabriz

Farhad Pirmoahammadi Alishah

Volume 6, Issue 22 , July 2015, , Pages 71-90

Abstract

In the south of Tabriz northern part of Uromieh-Dokhtar magmatic zone a set of volcanic rocks crop out with composition of andesite, dacite, rhyodacite and rhyolite with Upper Miocene ... Read More In the south of Tabriz northern part of Uromieh-Dokhtar magmatic zone a set of volcanic rocks crop out with composition of andesite, dacite, rhyodacite and rhyolite with Upper Miocene to Plio-Quaternary in age. This paper reports the dacitic, rhyodacitic and rhyolitic lavas erupted within the pyroclastic rocks. The most abundant minerals in these rocks are plagioclase and amphibole with various textures such as felsitic porphyric, microlitic porphyric, sieve, flow and glomeroporphyric. Based on geochemical study, these rocks are characterized by SiO2 ranging from 58.2 to 69.7 wt%, high Al2O3 (15.1-17.5 wt%) and Sr (391-804 ppm), high Sr/Y (30.7-84.46), La/Yb (13.27-67.36) ratios, and low Y (3.6-20.8ppmindicating the adakitic characteristic of the parent magmas. The parent magma of these rocks has calc-alkaline and per-aluminous nature which is characteristics of the arc volcanics. These rocks fall into the field of high-silica adakites (HAS) in classification diagrams. Enrichment in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) and depletion in heavy rare earth elements (HREEs) are observed in their MORB, primitive mantle and chondrite normalized spider diagrams. Strong depletion in HFSEs including Nb, Ti and P which is signature of arc volcanic, can be observed in these rocks. Intensive fractionated pattern of REEs and low quantities of HREEs and Y may prove existence of garnet or amphibole in the residua of melt. High Sr and negative anomalies of Ta, Nb, and Ti may be resulted from lack of plagioclase and having iron and titanium oxides in the residua phase. According to the petrogenetic diagrams, the parental magma of the rocks studied generated by partial melting of an eclogitic-garnet amphibolitic source derived from metamorphism of the Neotethyan subducted oceanic slab underneath the Cetral Iranian zone. Also, the magma has been subjected to assimilation, fractional crystallization (AFC) and crustal contamination during ascend to higher levels and emplacement. The presence of the corrosion and chemical disequilibrium of the phenocrysts and their sieve textures in these rocks support the occurrence of these processes.

Genesis of adakitic magmatism in Sahand region, Eastern Azarbaijan

Farhad Pirmoahammadi Alishah; Ahmad Jahangiri

Volume 5, Issue 20 , January 2015, , Pages 15-34

Abstract

We present new whole rock geochemical data for the Sahand dacite and rhyolite rocks lying in the south of Tabriz, and formed during the Oligo-Miocene period, when the collision between ... Read More

Petrology and geochemistry of volcanic rocks from the South of Tabriz (Sahand Volcano)

Farhad Pirmohammadi Alishah; Ali Ameri; Ahmad Jahangiri; Mansour Mojtahedi; Mehmet Keskin

Volume 3, Issue 9 , June 2012, , Pages 37-56

Abstract

The area under study is situated in the south of Tabriz and east of Urmia Lake. The area is dominated by a sequence of volcanic rock ranging from rhyolitic to dacitic composition related ... Read More

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Author = Pirmohammadi Alishah, Farhad

Petrography, Geochemistry and Tectonic Setting of the Harris Granite Body, Located in Mishu Mountains, Northwest of Iran (Shabestar City)

Abstract

Petrogenesis of post-collisional Plio-Quaternary adakitic rocks in south of Tabriz

Abstract

Genesis of adakitic magmatism in Sahand region, Eastern Azarbaijan

Abstract

Petrology and geochemistry of volcanic rocks from the South of Tabriz (Sahand Volcano)

Abstract