Mehdi Rezaei‐Kahkhaei

University of Shahrood

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Habibollah Ghasemi

University of Shahrood

Dariush Esmaeily

University of Tehran

Fernando Corfú

University of Oslo

Mahmoud Sadeghian

University of Shahrood

Yuruo Shi

Chinese Academy of Geological Sciences

Muriel Erambert

University of Oslo

A Kananian

University of Tehran

Carmen Galindo

Hospital Universitario Infanta Leonor

Lambrini Papadopoulou

Aristotle University of Thessaloniki

Nazanin Sarhadi

University of Shahrood

Cooperative Institutions

University of Shahrood

University of Tehran

Tarbiat Modares University

Institute of Earth Sciences, Academia Sinica

Academia Sinica

Aristotle University of Thessaloniki

Universidad Complutense de Madrid

Chinese Academy of Sciences

National Taiwan University

Institute of Geology and Mineral Exploration

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Geochemistry of the Zargoli granite: Implications for development of the Sistan Suture Zone, southeastern Iran

Island Arc (2010)

Mehdi Rezaei‐Kahkhaei A Kananian Dariush Esmaeily Abbas Asiabanha

Abstract The Zargoli granite, which extends in a northeast–southwest direction, intrudes into the Eocene–Oligocene regional metamorphic flysch‐type sediments in the northwest of Zahedan. This pluton, based on modal and geochemical classification, is composed of biotite granite and biotite granodiorite, was contaminated by country rocks during its emplacement, and is slightly changed to more aluminous. The SiO 2 content of these rocks range from 62.4 to 66 wt% with an alumina saturation index of Shand [molar Al 2 O 3 /(CaO + Na 2 O + K 2 O)] ∼ 1.1. Most of its chemical variations could be explained by fractionation or heterogeneous distribution of biotite. The features of the rocks resemble those which are typical to post‐collisional granitoids. Chondrite‐normalized rare‐earth element patterns of these rocks are fractionated at (La/Lu) N = 2.25–11.82 with a pronounced negative Eu anomaly (Eu/Eu* = 3.25–5.26). Zircon saturation thermometry provides a good estimation of magma temperatures (767.4–789.3°C) for zircon crystallization. These characteristics together with the moderate Mg# [100Mg/(Mg + Fe)] values (44–55), Fe + Mg + Ti (millications) = 130–175, and Al–(Na + K + 2Ca) (millications) = 5–50 may suggest that these rocks have been derived from the dehydration partial melting of quartz–feldspathic meta‐igneous lower crust.

10.1111/j.1440-1738.2009.00704.x

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Citations (15)

Tourmaline and rutile geochemistry in the Early–Middle Devonian sandstones of the Padeha Formation, Alborz Range, Northern Iran

Geological Journal (2021)

Mahdi Jafarzadeh Katarína Bónová Tomáš Mikuš Ján Bóna Mehdi Rezaei‐Kahkhaei

The provenance of Devonian sandstones of the Padeha Formation (Fm.), Eastern Alborz in Iran, has been investigated by standard heavy‐mineral analysis and tourmaline and rutile geochemistry. Heavy‐mineral assemblage is dominated by the ultra‐stable tourmaline, zircon, and rutile, while unstable species are completely absent. The Padeha Fm. sandstones show a very high value of zircon‐tourmaline‐rutile index signalizing either strong weathering in source area(s) or their recycled origin in older Early Palaeozoic formations. Detrital tourmaline shows predominantly dravitic, lesser Mg‐foititic, and uvitic compositions and metasedimentary origin. Metapelitic source is also indicated by rutile geochemistry. Temperature estimates according to Zr‐in‐rutile thermometry show a wide range from 519 to 872°C and indicate the presence of low‐ to upper‐amphibolite and granulite facies metapelitic rocks. Based on chemical composition of detrital tourmaline and rutile, we inferred that the crystalline basement rocks of the Arabian–Nubian Shield were potential primary sources for the Padeha Fm. deposits. Shape of tourmaline and rutile as well as their microtexture surface features indicate long‐distance transport, storage, and recycled history.

Tourmaline

Rutile

Devonian

Ilmenite

10.1002/gj.4201

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Citations (2)

Petrogenetic modeling of rock variety in the Khalkhab–Neshveh pluton, NW of Saveh, Iran

Island Arc (2011)

Mehdi Rezaei‐Kahkhaei Dariush Esmaeily Fernando Corfú

Abstract The Khalkhab–Neshveh (KN) pluton is a part of Urumieh–Dokhtar Magmatic Arc and was intruded into a covering of basalt and andesite of Eocene to early Miocene age. It is a medium to high‐K, metaluminous and I‐type pluton ranging in composition from quartz monzogabbro, through quartz monzodiorite, granodiorite, and granite. The KN rocks show subtle differentiation trends strongly controlled by clinopyroxene, plagioclase, hornblende, apatite, and titanite, where most major elements (except K 2 O) are negatively correlated with SiO 2 ; and Al 2 O 3 , Na 2 O, Sr, Eu, and Y define curvilinear trends. Considering three processes of magmatic differentiation including mixing and/or mingling between basaltic and dacitic magmas, gravitational fractional crystallization and in situ crystallization revealed that the latter is the most likely process for the evolution of KN magma. This is supported by the occurrence of all rock types at the same level, the lack of mafic enclaves in the granitoid rocks, the curvilinear trends of Na 2 O, Sr, and Eu, and the constant ratios of ( 87 Sr/ 86 Sr) i from quartz monzodiorite to granite (0.70475 and 0.70471, respectively). In situ crystallization took place via accumulation of plagioclase and clinopyroxene phenocrysts and concentration of these phases in the quartz monzogabbro and quartz monzodiorite at the margins of the intrusion at T ≥ 1050°C, and by filter pressing and fractionation of hornblende, plagioclase, and later biotite in the granitoids at T = ∼880°C.

Hornblende

Phenocryst

Fractional crystallization (geology)

Igneous differentiation

10.1111/j.1440-1738.2011.00769.x

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Citations (0)

Mineral chemistry and P-T conditions of the adakitic rocks from Torud–Ahmad Abad magmatic belt, S-SE Shahrood, NE Iran

Journal of Geochemical Exploration (2017)

Fazilat Yousefi Mahmoud Sadeghian Christina Wanhainen Habibollah Ghasemi Lambrini Papadopoulou

Dacite

Amphibole

Geothermobarometry

Hornblende

Basaltic andesite

Diorite

Pyroxene

Silicic

10.1016/j.gexplo.2017.09.006

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Citations (6)

Mineral chemistry and ages of the Eocene Gapdan granitoid pluton and related dykes (Sistan suture zone, eastern Iran): multi-stage emplacement of a zoned pluton during progressive deformation and exhumation

Journal of Asian Earth Sciences (2021)

Mehdi Rezaei‐Kahkhaei Fernando Corfú Marzieh Sheykhi Habibollah Ghasemi Yuruo Shi

Diorite

10.1016/j.jseaes.2021.104813

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Citations (5)

INTERPRETATION OF THE MAGMA CHAMBER PROCESSES USING MICRO-TEXTURE AND ZONING STYLES IN PLAGIOCLASE CRYSTALS: EVIDENCE FROM THE ANDESITIC ROCKS IN SABZEVAR ZONE (NE IRAN)

Carpathian Journal of Earth and Environmental Sciences (2023)

Soheila Saki Lambrini Papadopoulou Amir Ali Tabbakh Shabani Mahmoud Sadeghian Mehdi Rezaei‐Kahkhaei

Investigation of variations in the micro-texture and chemical composition of plagioclases (core to rim) allows the sequencing of the magma chamber processes and helps interprete and associate textures to specific processes. In this contribution, the micro-textures and chemical zoning of the plagioclases, significant recorder of magma chamber processes, from the west of Torbat-e-Heydariyeh andesitic rocks (WTHAR) are considered to decipher the physical and chemical parameters of magma evolution. The rocks are cropped out in the northern branch of Neotethyan magmatic belt and considered as the products of Eocene magmatic activities of the Sabzevar zone (N-NE Iran). The rocks show vitrorphyric and vitroglomeroporphyric textures with main phenocrysts, plagioclase (andesine, labradorite, and bytownite), clinopyroxene (augite), orthopyroxene and magnetite scattered in a glassy matrix. The recognized micro-textures of the WTHA plagioclases can be divided into two categories: (i) growth- related textures in the form of coarse-sieved (CS), fine-sieved (FS), core sieved and intact margin (CSIM), core intact and sieved margin (CISM) and entirely sieved (ES) morphologies, oscillatory zoning (OZ), rounded zone corner (RZC) and resorption surfaces (RS) formed due to the changes in temperature, melt H2O content, pressure, composition of the melt, equilibrium at the crystal-melt interface and (ii) morphological textures such as glomerocrysts (GLO), synneusis (SY), swallow-tail (ST) crystals, broken crystals (BC), formed by the effect of dynamic behavior of the crystallizing magma (convection, degassing, etc.) and magmatic differentiation. Also, the occurrence of these changes can be related to the self-mixing process in the magma chamber. The self-mixing with recharge event can be the reason for the dynamic activities in the magma chamber.

Phenocryst

Magma chamber

Igneous differentiation

Pyroxene

Texture (cosmology)

10.26471/cjees/2023/018/254

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Adakite genesis and plate convergent process: Constraints from whole rock and mineral chemistry, Sr, Nd, Pb isotopic compositions and U-Pb ages of the Lakhshak magmatic suite, East Iran

Lithos (2022)

Mehdi Rezaei‐Kahkhaei Fernando Corfú Carmen Galindo Reza Rahbar Habibollah Ghasemi

Adakite

Dacite

Titanite

10.1016/j.lithos.2022.106806

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Citations (2)

Thermobarometric and structural constraints on multistage emplacement mechanism of the Garagheh pluton, Sistan Suture Zone (SE Iran)

Journal of Asian Earth Sciences (2023)

Nazanin Sarhadi Mehdi Rezaei‐Kahkhaei Yuruo Shi Muriel Erambert Habibollah Ghasemi

Mylonite

10.1016/j.jseaes.2023.105624

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Citations (2)

Mineral Chemistry of the Gowd-E-Howz (Siah-Kuh) Complex Stock, Se, Iran: Insight to Tectonomagmatic Setting and Physicochemical Conditions of Magma Crystallization

habibollah ghasemi Mahboubeh Arabzadeh-Baniasadi Samuel Angiboust Mehdi Rezaei‐Kahkhaei Lambrini Papadopoulou

10.2139/ssrn.5023409

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Geochemical and isotopic (Nd and Sr) constraints on elucidating the origin of intrusions from northwest Saveh, Central Iran

Geopersia (2014)

Mehdi Rezaei‐Kahkhaei Dariush Esmaeily Carmen Carmen Galindo Francisco

Three intrusive granitoid bodies from northwest Saveh, central Iran, are embedded in volcanic sedimentary rocks of the Eocene,forming isolated small outcrops: Khalkhab quartz monzodioritic units (SiO2: ~52-57 wt %) to the northwest, Neshveh granodioriticunits (SiO2: ~62-71 wt %) to the northeast, and Selijerd granodioritic units (SiO2: ~63-69 wt %) to the southeast. The Khalkhab unit iscomposed of quartz monzogabbro and quartz monzodiorite with medium- to coarse-grained textures. The Neshveh unit is composedmainly of granodiorite with subordinate granite of medium grain size and a porphyritic texture with plagioclase megacryst. The Selijerdunit ranges from granodiorite to tonalite with a medium- to coarse-grained granophyric texture. The rocks studied display a relativelyhigh Na2O content,with a molecular A/CNK ratio less than 1.1, Na2O/ K2O ratio of ~2.06 and calc-alkaline affinity. They containmodal clinopyroxene, hornblende, magnetite and titanite, suggesting I-type characteristics for these rocks and formation in an activecontinental margin. Isotopic data (87Sr/86Sr39Ma= 0.704536-0.704860; e(Nd)39Ma= 2.2-3.9) from northwest Saveh intrusive rocks areplotted to the left of bulk silicate Earth. These ratios, together with geochemical data, suggest that the parent magmas of the rocksstudied might be generated by crystal fractionation of arc basalts in crustal magma chambers, coupled with some lower crustalassimilation prior to silica enrichment, to form quartz monzogabbros. Consequently, granodiorites formed dominantly by crystalfractionation from evolved parental magmas that ascended into the upper crustal magma chambers.

Porphyritic

Hornblende

Titanite

Amphibole

10.22059/jgeope.2014.51195

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Citations (2)