Age and geotectonic position of the Malayer granitoids: Implication for plutonism in the Sanandaj-Sirjan Zone, W Iran

Ahadnejad, Vahid; Valizadeh, M V; Deevsalar, Reza; Rezaei-Kahkhaei, Mehdi

doi:10.1127/0077-7749/2011/0149

Cited by 51 publications

(42 citation statements)

References 44 publications

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“…Middle Jurassic MBPC granitic rocks, Ahadnejad et al 2010). In this regard, just three cumulate 344 gabbros do display significant deviation from the other samples on crustal contamination.…”

Section: Discussionmentioning

confidence: 87%

Mesozoic–Cenozoic mafic magmatism in Sanandaj–Sirjan Zone, Zagros Orogen (Western Iran): Geochemical and isotopic inferences from Middle Jurassic and Late Eocene gabbros

Deevsalar

Shinjo

Ghaderi

et al. 2017

Lithos

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Section: Discussionmentioning

confidence: 87%

Mesozoic–Cenozoic mafic magmatism in Sanandaj–Sirjan Zone, Zagros Orogen (Western Iran): Geochemical and isotopic inferences from Middle Jurassic and Late Eocene gabbros

Deevsalar

Shinjo

Ghaderi

et al. 2017

Lithos

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“…1). Major progress has been made in recent years in unravelling the ages of these complexes by U-Pb zircon geochronology (e.g., Ahmadi-Khalaji et al, 2007, Shahbazi et al, 2010, Mahmoudi et al, 2011, Ahadnejad et al, 2011, Esna-Ashari et al, 2012, Alirezaei and Hassanzadeh, 2012. However, the obtained ages often differ from those obtained by earlier K-Ar and Rb-Sr studies (e.g., Valizadeh and Cantagrel, 1975;Braud, 1987;Masoudi, 1997;Baharifar, 2004;Baharifar et al, 2004).…”

Section: Introductionmentioning

confidence: 48%

“…LA-ICP-MS U-Pb zircon ages of the Malayer pluton span an age range between 187 and 162 Ma (mid-Jurassic) (Ahadnejad et al, 2011). According to Ahmadi-Khaladji et al (2007), the Boroujerd granitoid complex has similar U-Pb zircon ages of 172-169 Ma.…”

Section: U-pb Age Datamentioning

confidence: 99%

Geochronology of plutonic rocks from the Sanandaj-Sirjan zone, Iran and new zircon and titanite U-Th-Pb ages for granitoids from the Marivan pluton

et al. 2014

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Abstract:The Sanandaj-Sirjan zone of Iran is a metamorphic belt consisting of rocks which were metamorphosed under different pressure and temperature conditions and intruded by various plutons ranging in composition from gabbro to granite. The majority of these granitoids formed along the ancient active continental margin of the Neo-Tethyan ocean at the southeastern edge of the central Iranian microplate. Geochronological data published in recent years indicate periodic plutonism lasting from Carboniferous through Mesozoic to late-Paleogene times (from ca. 300 to ca. 35 Ma) with climax activity during the mid-and late-Jurassic. The age constraints for plutonic complexes, such as Siah-Kouh, Kolah-Ghazi, Golpayegan (Muteh), Azna, Aligoodarz, Astaneh, Borujerd, Malayer (Samen), Alvand, Almogholagh, Ghorveh, Saqqez, Marivan, Naqadeh and Urumieh, clearly indicate the periodic nature of magmatism. Therefore, the Sanandaj-Sirjan zone preserves the record of magmatic activity of a complete orogenic cycle related to (1) Permocarboniferous(?) rifting of Gondwana and opening of the Neo-Tethyan ocean, (2) subduction of the oceanic crust, (3) continental collision and (4) post-collision/post-orogenic activities. The formation of the Marivan granitoids, northwestern Sanandaj-Sirjan zone, for which we present U-Pb zircon and titanite ages of ca. 38 Ma, can be related to the collisional and post-collisional stages of this orogenic cycle.

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“…This feature has been detected in the Malayer pluton, where initial 87 Sr/ 86 Sr ratios increase from an average of 0.7085 in the marginal Q-diorites and the 0.7087 in granodiorites, to ca. 0.7011 in the syenogranites from the central part of pluton (Ahadnejad et al 2011). Furthermore, co-existence of antagonistic mineral assemblages (e.g.…”

Section: Malayer Intrusive Complexmentioning

confidence: 99%

“…The scattered pattern of elements may have been caused by this process. U-Pb zircon ages (MiddleJurassic) has been obtained from all rock types of complex (Ahadnejad et al 2011) indicate that emplacement of this pluton was performed during the subduction of Neotethys under Central Iran in an active continental margin tectonic setting. In the Pearce et al (1984) discrimination diagrams the studied rocks plot mostly within the field of volcanic arc granites (VAG) (Fig.…”

Section: Malayer Intrusive Complexmentioning

confidence: 99%

The ammonium content in the Malayer igneous and metamorphic rocks (Sanandaj-Sirjan Zone, Western Iran)

Ahadnejad¹,

Hirt²,

Valizadeh³

et al. 2011

Geologica Carpathica

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Abstract:The ammonium (NH 4 + ) contents of the Malayer area (Western Iran) have been determined by using the colorimetric method on 26 samples from igneous and metamorphic rocks. This is the first analysis of the ammonium contents of Iranian metamorphic and igneous rocks. The average ammonium content of metamorphic rocks decreases from low-grade to high-grade metamorphic rocks (in ppm): slate 580, phyllite 515, andalusite schist 242. In the case of igneous rocks, it decreases from felsic to mafic igneous types (in ppm): granites 39, monzonite 20, diorite 17, gabbro 10. Altered granitic rocks show enrichment in NH 4 + (mean 61 ppm). The high concentration of ammonium in Malayer granites may indicate metasedimentary rocks as protoliths rather than meta-igneous rocks. These granitic rocks (S-types) have high K-bearing rock-forming minerals such as biotite, muscovite and K-feldspar which their potassium could substitute with ammonium. In addition, the high ammonium content of metasediments is probably due to inheritance of nitrogen from organic matter in the original sediments. The hydrothermally altered samples of granitic rocks show highly enrichment of ammonium suggesting external sources which intruded additional content by either interaction with metasedimentary country rocks or meteoritic solutions.

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Age and geotectonic position of the Malayer granitoids: Implication for plutonism in the Sanandaj-Sirjan Zone, W Iran

Cited by 51 publications

References 44 publications

Mesozoic–Cenozoic mafic magmatism in Sanandaj–Sirjan Zone, Zagros Orogen (Western Iran): Geochemical and isotopic inferences from Middle Jurassic and Late Eocene gabbros

Mesozoic–Cenozoic mafic magmatism in Sanandaj–Sirjan Zone, Zagros Orogen (Western Iran): Geochemical and isotopic inferences from Middle Jurassic and Late Eocene gabbros

Geochronology of plutonic rocks from the Sanandaj-Sirjan zone, Iran and new zircon and titanite U-Th-Pb ages for granitoids from the Marivan pluton

The ammonium content in the Malayer igneous and metamorphic rocks (Sanandaj-Sirjan Zone, Western Iran)

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