Geochemistry and mineral chemistry of pyroxenite xenoliths and host volcanic alkaline rocks from north west of Marand (NW Iran)

Khezerlou, Ali Akbar; Amel, Nasir; Grégoire, Marilaure; Moayyed, Mohsen; Jahangiri, Ahmad

doi:10.1007/s00710-017-0502-6

Cited by 9 publications

(37 citation statements)

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“…13a). Considering mineral phase assemblages and textures, it has been suggested that these cumulate xenoliths have a magmatic origin and begin to crystallize from 2.2 to 0.5 GPa (e.g., Semiz et al, 2012;Khezerlou et al, 2017). Exotic parental melts (i.e., kamafugite, lamproite and lamprophyre) have been proposed as the parental magmas of some of these ultramafic cumulates (Prelević et al 2014;Platevoet et al, 2014;Semiz et al, 2012).…”

Section: The Formation Of Tk Lavas: Mixing Of Variable Compositions Amentioning

confidence: 99%

“…In addition to this specific group of cumulates, other cumulate xenoliths from the TIP display a wide range of Sr and Nd isotopic ratios (Khezerlou et al, 2017;Prelević et al 2014;Semiz et al, 2012;Saadat et al, 2014). The observation of reverse zoning in clinopyroxenes and of cognate antecrystals and cumulative xenoliths hosted by TK lavas, has been interpreted as evidence of either mixing between melts of different compositions (mostly distinct UK and alkaline, probably sodic) or of the assimilation of solids by liquid phases (Semiz et al, 2012;Platevoet et al, 2014;Prelević et al 2014).…”

Section: The Formation Of Tk Lavas: Mixing Of Variable Compositions Amentioning

confidence: 99%

“…143 Nd/ 144 Nd versus 87 Sr/ 86 Sr for each group of lavas compared with various mantle components. Data sources: DMM: Depleted MORB Mantle and Oceanic Island Basalt (OIB) afterZindler & Hart (1986); group I, II and transitional kimberlites:Becker & Le Roex, 2006; GLOSS: global subducting sediment,Plank & Langmuir (1998); cumulative xenoliths from NW of Iran:Khezerlou et al (2017).…”

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confidence: 99%

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Transport of Volatile-rich Melt from the Mantle Transition Zone via Compaction Pockets: Implications for Mantle Metasomatism and the Origin of Alkaline Lavas in the Turkish–Iranian Plateau

Soltanmohammadi

Grégoire

Rabinowicz

et al. 2018

Journal of Petrology

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Section: The Formation Of Tk Lavas: Mixing Of Variable Compositions Amentioning

confidence: 99%

Section: The Formation Of Tk Lavas: Mixing Of Variable Compositions Amentioning

confidence: 99%

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confidence: 99%

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Transport of Volatile-rich Melt from the Mantle Transition Zone via Compaction Pockets: Implications for Mantle Metasomatism and the Origin of Alkaline Lavas in the Turkish–Iranian Plateau

Soltanmohammadi

Grégoire

Rabinowicz

et al. 2018

Journal of Petrology

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“…These volcanic rocks contain various xenoliths, including pyroxenite, hornblendite, amphibolite, gabbro, and diorite. The most important studies in this area were by Ahmadzadeh (2010), focusing on the Galleban area; by Khezerlou (2006) and Parkani (1998), focusing on the northwest of Marand and Zanjireh areas, respectively; and by Khezerlou et al (2017), focusing on pyroxenite xenoliths and their host volcanic rocks. The previous geochemical and tectonic studies of volcanic rocks have demonstrated their dominant alkaline affinity and their formation in a postcollisional environment (e.g., Parkani 1998;Khezerlou 2006;Ahmadzadeh 2010).…”

Section: Introductionmentioning

confidence: 99%

“…In their study of pyroxenite xenoliths from the Uromieh-Dokhtar magmatic belt, Khezerlou et al (2017) proposed that their magmas originated from enriched mantle. Gabbros and diorites are the most abundant xenolith types in the volcanic rocks from the studied area; however, the research focusing on xenoliths have been scarce.…”

Section: Introductionmentioning

confidence: 99%

Origin and Formation Process of Gabbro and Diorite Xenoliths in the Northern Part of Uromieh-Dokhtar Magmatic Belt, NW Iran: Constraints from Mineral and Whole-Rock Chemistries

Khezerlou

Grégoire

Amel

et al. 2020

The Journal of Geology

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Gabbro and diorite xenoliths occur within the alkaline trachyandesites in the northern part of Uromieh-Dokhtar magmatic belt (NW Iran). The host volcanic rocks are located on the upper Miocene sediments; therefore, they are probably Plio-Quaternary in age. The texture of xenoliths is granular, and the gabbro xenoliths are classified into two groups based on their petrographic characteristics and mineral chemistry. Based on chemical analyses, xenoliths show a subalkaline to slightly alkaline magmatic trend. Thermobarometric results indicate that gabbro and diorite xenoliths formed within the middle crustal level. All xenolith samples are light rare earth elements (LREEs) enriched and depleted in Ta, Zr, and Nb. These features can be explained by the subduction of the Neotethys. The LREE enrichment as well as negative Th, Ti, Nb, and Zr anomalies and positive Pb anomaly are in agreement with an origin through partial melting of an enriched mantle previously affected by metasomatism processes linked to mantle wedge-derived melts (fluids). Different REE concentration levels and patterns for Group 1 gabbro, Group 2 gabbro, and diorite xenoliths point out that their parental melts were not the same. Those forming the Group 1 gabbro xenoliths originated from melting of garnet mantle lherzolite, whereas the parental melts from Group 2 gabbro and diorite xenoliths originated from melting of spinel-garnet mantle lherzolite. The 86 Sr/ 87 Sr and 143 Nd/ 144 Nd ratios and chemical composition of minerals are different for host volcanic rocks and xenoliths; therefore, we may conclude that the parental melts of the different groups of xenoliths and host volcanic rocks differ in composition.

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Tectonic settings of the Plio–Quaternary volcanism in Iran from multidimensional and multielement solutions

Verma

Molaei‐Yeganeh

2021

Geological Journal

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Geochemical data for 435 samples of the Pliocene to Quaternary (P–Q) volcanic rocks from Iran, distributed mostly along a NW–SE trending belt, were compiled from 28 papers (12 written in Persian). Until now, the rock nomenclature employed has been inconsistent with the recommendations of the International Union of Geological Sciences (IUGS). Moreover, older bivariate and ternary tectonic discrimination diagrams and only traditional qualitative approaches using Nb and Ta anomalies, have been used to understand the origin and evolution of the P–Q magmas. The P–Q magma and rock types were classified by strictly following the IUGS recommendations. Two geochemometric multidimensional models based on 10 and 16 elements, along with two decision procedures, capable of discriminating 29 fine tectonic settings, were used to document the existence of six tectonic settings in Iran during the P–Q. The rare earth elements indicated that the evolved intermediate and silicic rocks had a significant crustal component in their origin. The quantification of Nb and Ta anomalies in multielement diagrams was used to support the tectonic inferences from the multidimensional geochemometric models.

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Geochemistry and mineral chemistry of pyroxenite xenoliths and host volcanic alkaline rocks from north west of Marand (NW Iran)

Cited by 9 publications

References 61 publications

Transport of Volatile-rich Melt from the Mantle Transition Zone via Compaction Pockets: Implications for Mantle Metasomatism and the Origin of Alkaline Lavas in the Turkish–Iranian Plateau

Transport of Volatile-rich Melt from the Mantle Transition Zone via Compaction Pockets: Implications for Mantle Metasomatism and the Origin of Alkaline Lavas in the Turkish–Iranian Plateau

Origin and Formation Process of Gabbro and Diorite Xenoliths in the Northern Part of Uromieh-Dokhtar Magmatic Belt, NW Iran: Constraints from Mineral and Whole-Rock Chemistries

Tectonic settings of the Plio–Quaternary volcanism in Iran from multidimensional and multielement solutions

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