Results 101 to 110 of about 246 (131)

Exhalative deposits in eocene volcano-sedimentary rocks in the middle part of the Urumieh-Dokhtar magmatic belt: Detailed evidence from nabar deposit, west of Kashan, Urumieh – Dokhtar Magmatic Belt

Journal of African Earth Sciences, 2019
Abstract Meso-Cenozoic magmatic belt of Urumieh–Dokhtar resulted from subduction of Neothetys oceanic crust beneath the Central Iran Block with Gondwanic signature is dominated by calc-alkaline to alkaline igneous rocks. The magmatic rocks has mainly occurred in submarine environments as volcanic-volcanoclastics with interlayers of ...
Hemayat Jamali, Forough Sadat Zohouri, Seyed Mohsen Tabatabaei Manesh   +2 more
exaly   +2 more sources

Stable isotope geochemistry of travertines from northern Urumieh-Dokhtar volcano-plutonic belt, Iran

Carbonates and Evaporites, 2017
In Iran, almost all major travertine deposits with NW–SE trend are exposed in Urumieh-Dokhtar volcano-plutonic belt. In this study, morphology of travertine, source of CO2, and classification of travertine were investigated using geochemistry of carbon dioxide, stable carbon and oxygen isotopic analysis, SEM images and thin sections.
Farid Moore, Alireza Zarasvandi, Reinhard Gratzer   +2 more
exaly   +2 more sources

Evaluating physicochemical conditions of Miocene–Pliocene volcanic rocks in the middle part of the Urumieh-Dokhtar Magmatic Arc

Arabian Journal of Geosciences, 2015
Urumieh-Dokhtar Magmatic Arc (UDMA) resulted from subduction of the Arabian plate beneath the Eurasian plate. Miocene–Pliocene volcanic rocks in the middle part of UDMA located in the north of Isfahan (Central Iran) are mainly dacite. They are chiefly composed of phenocrysts of plagioclase, amphibole, and biotite lying in a matrix made of feldspar ...
Jamshid Ahmadian, Mohammad Sayari
exaly   +2 more sources

Tafresh intrusive rocks within the Urumieh‐Dokhtar Magmatic Arc: Appraisal of Neo‐Tethys subduction

Geological Journal, 2018
This paper presents UPb zircon dating and element compositions for Miocene intrusive rocks in NE Tafresh situated in the central Urumieh‐Dokhtar Magmatic Arc. These intrusive rocks, consisting of granodiorite and diorite, were emplaced during the Early Miocene (19.07–20.37 Ma), following extensive submarine volcanic activity in the Eocene.
Hassan Mirnejad, Davood Raeisi, Christopher McFarlane, Maryam Sheibi   +3 more
openaire   +2 more sources

Oligocene–Miocene geodynamic evolution of the central part of Urumieh-Dokhtar Arc of Iran

International Geology Review, 2014
Basic volcanic rocks from Tafresh, west Kashan, and west Nain volcanic successions in the central part of Urumieh-Dokhtar Magmatic Assemblage (UDMA) of Iran yield K–Ar ages ranging from 26.8 to 18.2 Ma. These ages indicate significant Late Oligocene–Early Miocene basic volcanism in the UDMA.
Mohammad Reza Ghorbani, Ian T. Graham, Majid Ghaderi   +2 more
openaire   +1 more source

Petrological constraints on the origin of the plutonic massif of the Ghaleh Yaghmesh area, Urumieh–Dokhtar magmatic arc, Iran

Journal of African Earth Sciences, 2017
Abstract The Oligocene Ghaleh Yaghmesh plutonic massif (GYPM) consists of diorite, quartz-diorite, tonalite and granodiorite and evolving from metaluminous nature. All the samples are predominantly medium-K calc-alkaline series, having typical characteristics of I-type granitoids.
Fazeli, Bahareh, Khalili, Mahmoud, Toksoy Köksal, Fatma, Esfahani, Mahin Mansouri, Beavers, Roy   +4 more
openaire   +2 more sources

Geochemistry and petrogenesis of Ghohroud Igneous Complex (Urumieh–Dokhtar zone): evidence for Neotethyan subduction during the Neogene

Arabian Journal of Geosciences, 2015
The Oligo–Miocene Ghohroud granitoid is located in the north of Isfahan, in the Urumieh–Dokhtar magmatic arc (UDMA). The rock composition ranges from granodiorite to tonalite. Rocks mainly include quartz, plagioclase, and alkali feldspar with minor biotite and amphibole. Dacitic and basaltic rocks outcrop as dykes.
Ali Ghasemi, Sayed Mohsen Tabatabaei Manesh   +1 more
openaire   +1 more source

Structural and petrological evidence for the continuation of the Isfahan fault system across the Urumieh-Dokhtar zone of central Iran

Geotectonics, 2012
The Isfahan fault system, a north-trending, dextral strike-slip fault across the Sanandaj-Sirjan zone, represents the boundary between the northwestern and the southeastern parts of the Sanandaj-Sirjan zone and it terminates in the north at the southern boundary of the Urumieh-Dokhtar zone.
H. Safaei, S. M. Tabatabaeimanesh, S. N. Hashemi, A. S. Mirlohi, H. Vafa   +4 more
openaire   +1 more source

Identification of Fe3 content in Epidote from Varan, Urumieh-Dokhtar magmatic arc, Iran: using FTIR and Raman spectroscopy

2022
This study is aimed to determine the Fe content in natural epidote from Varan area (Urumieh-Dokhtar Magmatic Arc, Iran) by using vibrational FTIR and Raman spectroscopy and EPMA analyses. Fe3+ concentration calculated from FTIR spectroscopic data is in the range of 0.96 to 1 apfu. The results are in complete agreement with EPMA data.
Rahimzadeh, Bahman, Ghosoun, Zheira, Masoudi, Fariborz   +2 more
openaire   +1 more source

Magmatic and geodynamic evolution of Urumieh–Dokhtar basic volcanism, Central Iran: major, trace element, isotopic, and geochronologic implications

International Geology Review, 2012
Basic volcanic rocks from the West Nain area of the Urumieh–Dokhtar Magmatic Assemblage demonstrate significant subduction-related geochemical characteristics; these along with the new age data obtained for the volcanic rocks shed new light on the geodynamic evolution of the Iranian segment of Alpine–Himalayan orogeny. The late Oligocene (26.5 Ma) high-
Hadi Yeganehfar, Mohammad Reza Ghorbani, Ryuichi Shinjo, Majid Ghaderi   +3 more
openaire   +1 more source