Small-volume melts of lithospheric mantle during continental collision: Late Cenozoic lavas of Mahabad, NW Iran

Kheirkhah, Monireh; Neill, Iain; Ajdari, K.

doi:10.1016/j.jseaes.2013.06.002

Cited by 23 publications

(12 citation statements)

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“…6b and c). (Saadat and Stern, 2012), the Nayband/Neh Fault system (Saadat and Stern, 2010;Pang et al, 2012), and compilations from NW Iran (Kheirkhah et al, 2013) and selected subduction-modified centres in the Caucasus and Eastern Anatolia .…”

Section: Isotope Evidencementioning

confidence: 99%

“…The production of mafic collision zone magmas is commonly linked with lithospheric thinning (e.g., Pearce et al, 1990;Turner et al, 1992), or to mantle upwelling following break-off of the down-going oceanic slab (Davies and von Blanckenburg, 1995). Magmatism has also been associated with dewatering of hydrous phases in the lithospheric mantle (e.g., Allen et al, 2013a;Kheirkhah et al, 2013), melting of deeply-subducted continental crust (Zhao et al, 2013) and small-scale sub-lithospheric convection . Mantle-derived collision zone magmas are documented for many Phanerozoic orogenic belts including Tibet (Williams et al, 2004), Taiwan (Wang et al, 2004), the Sulu Orogen (Zhang et al, 2010), the Hercynides (Seltmann et al, 2011) and the Caledonides (Atherton and Ghani, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Most collision magmatism in the plateau has an incompatible element-enriched calc-alkaline or shoshonitic signature with trace element evidence for the presence of subduction-modified lithospheric mantle sources (Pearce et al, 1990;Kheirkhah et al, 2009;Dilek et al, 2010;Neill et al, 2013a). Magmatic activity has been variously linked to the processes above (Pearce et al, Keskin, 2003;Pang et al, 2013;Allen et al, 2013a;Neill et al, 2013a;Kheirkhah et al, 2013;. However, there are several Late Cenozoic mafic volcanic centres on the plateau in Eastern Iran (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Kheirkhah

Neill

2015

Journal of Asian Earth Sciences

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a b s t r a c tHundreds of compositionally diverse volcanoes have erupted on the Turkish-Iranian Plateau in the last 15 Myr, attributed to one or more of the processes of Middle Miocene Tethyan slab break-off, localised lithospheric delamination and small-scale convection. Magmatism post-dates the initial Late Eocene or Early Oligocene Arabia-Eurasia collision by >10 Myr. By contrast, in the east of the plateau in Eastern Iran there has been intermittent magmatism from the Late Oligocene to the Quaternary. Magma types include alkali basalt flows and scoria cones and adakite-like intermediate-felsic lavas and domes. New elemental and Nd-Sr-Pb-Hf isotope data from Quaternary mafic alkaline flows near Quchan in the Meshkan area in the NE of the country are combined with existing data from Miocene-Quaternary volcanic centres in the Binalud Range and the Nayband/Neh Fault zones. These mafic, incompatible element-enriched rocks, with positive Nb-Ta anomalies, are OIB-like and are argued to have formed by low-degree melting of a heterogeneous mantle source which contained DMM-and EMII-like components. At least some of the melting took place in the garnet stability field. Significant crustal contamination during magma ascent is recognised in the Nayband/Neh samples. Penecontemporaneous adakite-like rocks are argued to be high-pressure fractionates of basaltic melts which may have a separate source to the OIB-like basalts. Late Cenozoic mantle melting was aided by (1) localised extension and (2) enhanced small-scale asthenospheric convection related to Makran subduction, low mantle viscosity owing to the prior Tethyan subduction history of the region, and possibly edge-driven convection on the margin of the thickened Zagros lithosphere.

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Section: Isotope Evidencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Kheirkhah

Neill

2015

Journal of Asian Earth Sciences

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“…In addition to these intermediate-composition volcanic complexes, widespread but scattered eruption of mafic alkaline lavas from monogenetic vents likely reflects lithospheric mantle melting during post-collisional stress relaxation or localized extension (Ahmadzadeh et al, 2010;Allen et al, 2013;Kheirkhah et al, 2013;Pang et al, 2013).…”

Section: Regional Geological and Metallogenic Setting Of The Taftan Amentioning

confidence: 99%

Magmatic evolution and porphyry–epithermal mineralization in the Taftan volcanic complex, southeastern Iran

Richards

Razavi

Spell

et al. 2018

Ore Geology Reviews

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The Taftan volcanic complex is located above the Makran subduction zone in Sistan and Baluchestan province, southeastern Iran. The earliest volcanic activity at Taftan started in the late Miocene (~8 Ma) with eruption of andesitic to dacitic lava onto a Cretaceous to Eocene volcanic and sedimentary paleosurface ~20 km to the northwest of the current volcanic Eurasian plates (late Oligocene to earliest Miocene), and the subduction-related BazmanTaftan and Chagai Belt magmas. The porphyry deposits formed in these distinct settings are also virtually indistinguishable. This suggests that most of the processes affecting the geochemistry and metallogeny of the magmas in both settings take place in the lithosphere, albeit that the ultimate source of the magmas is in the supra-subduction zone asthenospheric mantle wedge. In collisional environments, subduction-related material previously crystallized in the deep lithosphere is simply being remobilized.

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“…1) and results from a variety of geodynamic and petrological processes including Neo-Tethyan slab break-off (Keskin, 2003;Zor et al, 2008), localised lithospheric detachment and sub-lithospheric convection (Kaislaniemi et al, 2014), crustal extension related to strike-slip faults (Sadaat et al, 2010;Shabanian et al, 2012) plus intra-lithospheric breakdown of hydrated peridotite (Allen et al, 2013;Sugden et al, 2019). The diversity of mafic to felsic magmatic products formed in the past few million years is high, ranging from alkaline to sub-alkaline, of within-plate to arc-like chemistry, and moderately to highly enriched incompatible trace element concentrations (Pearce et al 1990;Saadat and Stern, 2012;Pang et al, 2012Pang et al, , 2013Kheirkhah et al, 2013Kheirkhah et al, , 2015Allen et al, 2013;Sugden et al 2019). Many publications on Late Cenozoic samples identify trace element characteristics consistent with small volume melting of lithospheric mantle previously modified during subduction of the Neo-Tethyan oceanic slab(s) (Pearce et al, 1990;Keskin et al, 1998;Özdemir et al, 2006.…”

Section: Introductionmentioning

confidence: 99%

Distinct sources for high-K and adakitic magmatism in SE Iran

Kheirkhah

Neill

Allen

et al. 2020

Journal of Asian Earth Sciences

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Small-volume melts of lithospheric mantle during continental collision: Late Cenozoic lavas of Mahabad, NW Iran

Cited by 23 publications

References 64 publications

Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Magmatic evolution and porphyry–epithermal mineralization in the Taftan volcanic complex, southeastern Iran

Distinct sources for high-K and adakitic magmatism in SE Iran

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