Late Eocene–Oligocene post-collisional monzonitic intrusions from the Alborz magmatic belt, NW Iran. An example of monzonite magma generation from a metasomatized mantle source

Castro, Antonio; Aghazadeh, Mehraj; Badrzadeh, Zahra; Chichorro, M.

doi:10.1016/j.lithos.2013.08.003

Cited by 114 publications

(67 citation statements)

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“…1), is attributed to decompression melting of metasomatised lithospheric mantle during extension and thinning of the crust, and the adakitic composition is interpreted in terms of mantle metasomatism by slab-derived adakitic melts (Aghazadeh et al, 2011;Castro et al, 2013). This geodynamic evolution is comparable with the extensional flare-up evolution and asthenospheric upwelling scenario proposed by Verdel et al (2011) (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 52%

“…This study have allowed us to clarify the magmatic, geodynamic and metallogenic evolution , 2011Asiabanha and Foden, 2012;Castro et al, 2013), IV -Eocene rocks from central Alborz (Verdel et al, 2011), V -Eocene to Mio-Pliocene rocks from the northern UrumiehDokhtar belt (Omrani et al, 2008;Rezaei-Kahkhaei et al, 2011;Sarjoughian et al, 2012;Yeganehfar et al, 2013;Honarmand et al, 2014). The Zangezur and Nakhitchevan blocks belong to the South Armenian block of Gondwanian origin.…”

Section: Discussionmentioning

confidence: 95%

“…It is unlikely that the source was mantle metasomatised by adakitic slab melts (e.g. Rapp et al, 1999;Castro et al, 2013), because it would have required slab melting in the garnet stability field, for which there is no evidence based on magmatic rock data of this study. More realistic explanations (Fig.…”

Section: Magmatic Metallogenic and Geodynamic Evolution Of The Zangementioning

confidence: 86%

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Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

et al. 2016

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Section: Accepted Manuscriptmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 95%

Section: Magmatic Metallogenic and Geodynamic Evolution Of The Zangementioning

confidence: 86%

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Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

et al. 2016

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“…1). The SSZ is considered as the main magmatic arc resulting from Neo-Tethyan subduction during the Mesozoic (Azizi et al, 2011;Berberian and King, 1981), whereas the UDMA and AMB are interpreted to be associated with early to late Cenozoic subduction-related magmatism on the Zagros hinterland (Berberian and King, 1981;Berberian et al, 1982;Stöcklin, 1971), slab break-off (Agard et al, 2011;Ghasemi and Talbot, 2006;Haschke et al, 2010), slab roll-back (Jahangiri, 2007;Verdel et al, 2011) and post-collisional relaxation (Castro et al, 2013;Nabatian et al, 2014). Several petrogenetic models have been proposed for some of the magmatic segments in the UDMA and AMB including continental arc magmatism Hassanzadeh, 1993) to continental rifting (Amidi et al, 1984) and post-collisional tectonic setting (Aghazadeh et al, Ahmadian et al, 2009;Berberian and King, 1981;Castro et al, 2013;Honarmand et al, 2013;Nabatian et al, 2014).…”

Section: Regional Outline Of Alborz Magmatic Beltmentioning

confidence: 99%

“…1). Decompression melting of a metasomatized mantle source in a post-collisional tectonic setting is the most favorable explanation for the generation of high-potassic and shoshonitic magmas in Iran (Aghazadeh et al, 2011;Ahmadian et al, 2009;Castro et al, 2013;Nabatian et al, 2014;Torabi, 2011). Other authors (e.g.…”

Section: Introductionmentioning

confidence: 97%

Zircon U–Pb ages, geochemical and Sr–Nd–Pb–Hf isotopic constraints on petrogenesis of the Tarom-Olya pluton, Alborz magmatic belt, NW Iran

Nabatian

Jiang

Honarmand

et al. 2016

Lithos

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Geochemical and isotopic evidence for magma mixing/mingling in the Marshenan intrusion: Implications for juvenile crust in the Urumieh–Dokhtar Magmatic Arc, Central Iran

et al. 2018

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The 20.5 Ma Marshenan intrusion, situated to the north‐east of Isfahan City, comprises a small part of the Urumieh–Dokhtar Magmatic Arc (UDMA). According to the field and microscopic observations, the study area is composed of two major units: intermediate‐mafic and felsic magmatic rocks. The felsic units include spheroidal to ellipsoidal mafic microgranular enclaves ranging in size from a few millimetres to meters in size. These enclaves are composed of monzodiorite and gabbroic diorite, whereas the felsic and intermediate‐mafic rocks mainly consist of granite, granodiorite, diorite, and rarely gabbro on the basis of both mineralogical and chemical compositions. Enclaves are characterized by a microgranular texture and also reveal some special types of disequilibrium textures, for example, anti‐rapakivi, poikilitic K‐feldspar, skeletal amphibole, acicular apatite, sieve textures, spongy cellular textures in plagioclase, small lath‐shaped plagioclase in large plagioclase phenocrysts, large quartz phenocrysts in enclaves, and mafic clots. These features along with crenulated and occasionally diffuse contacts with the host granite and megacrysts of host feldspar in enclaves, implied that the enclaves have been injected as magmas to form globules into host granodioritic magma and underwent rapid cooling (quenching). They are mostly calc‐alkaline and metaluminous and show strong enrichment of LILEs and LREEs and depletion in HFSEs with negative Eu. The whole rock 87Sr/86Sr(i) and εNd(T) for the host intermediate‐mafic and felsic rocks vary from 0.70528 to 0.70555 and −0.7 to 1.7 and for the enclaves from 0.70526 to 0.70552 and −0.05 to 1.39. Sr–Nd isotope modelling results, in combination with young Nd model ages, indicate their “juvenile” character and suggest their derivation from source rocks or magmas separated from the upper mantle. It probably originates by partial melting of a juvenile lower crust (70–80%) with variable amounts of old lower crust (30–20%), involving mantle components. It is believed to have resulted from intense basaltic underplating and subsequent remelting that took place during the Early Miocene related to the Neo‐Tethys subduction processes. It resulted from a change in the geodynamic regime, including breakoff/rollback of the subducted slab and subsequent regional extension. Moreover, it suggests that new crustal growth during the Meso‐ to Neoproterozoic is an important mechanism in the early development of the central UDMA.

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Late Eocene–Oligocene post-collisional monzonitic intrusions from the Alborz magmatic belt, NW Iran. An example of monzonite magma generation from a metasomatized mantle source

Cited by 114 publications

References 58 publications

Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

Zircon U–Pb ages, geochemical and Sr–Nd–Pb–Hf isotopic constraints on petrogenesis of the Tarom-Olya pluton, Alborz magmatic belt, NW Iran

Geochemical and isotopic evidence for magma mixing/mingling in the Marshenan intrusion: Implications for juvenile crust in the Urumieh–Dokhtar Magmatic Arc, Central Iran

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