Late Cretaceous calc-alkaline and adakitic magmatism in the Sistan suture zone (Eastern Iran): Implications for subduction polarity and regional tectonics

Jentzer, Michael; Whitechurch, Hubert; Agard, Philippe; Ulrich, Marc; Caron, B.; Zarrinkoub, Mohammad Hossein; Kohansal, Reza; Miguet, Lucie; Omrani, Jafar; Fournier, Marc

doi:10.1016/j.jseaes.2020.104588

Cited by 15 publications

(6 citation statements)

References 85 publications

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“…The storage‐transport processes of the ascending melt can be detected by the strong attenuation features based on the crustal and uppermost mantle attenuation models. In the Lut Block, diffuse magmatism is almost continuous from the Early Cretaceous to the Quaternary (Jentzer et al., 2020). The formation of Lut volcanism may be related to WE‐dipping Sistan Oceanic subduction (e.g., Moghaddam et al., 2021; Saccani et al., 2010) and lithospheric delamination during the Lut‐Afghan collision (Pang et al., 2013).…”

Section: Discussionmentioning

confidence: 99%

Segmented Up‐Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography

Yang,

Chen,

Zhao

et al. 2023

JGR Solid Earth

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The Zagros orogen in the Iranian Plateau serves as a natural laboratory for studying the tectonic evolution of the transition from oceanic subduction to continental collision. Various observations from both geology and geophysics show that deep oceanic slabs may have detached one after another from the Arabian continental margin, forming a complex plate front beneath the Zagros orogen. However, where slab detachment occurred and how slab detachment affects shallower continental underthrusting remain poorly understood. The mechanism behind the complex post‐collision magmatism remains elusive. While the uppermost mantle is often considered the heart of the mantle lid, its rheological variations can provide insights into the underlying thermal structure. Here, we construct a high‐resolution Pn‐wave attenuation model for the uppermost mantle beneath the Iranian Plateau and surrounding areas using a newly compiled data set and constrain the lithospheric structure by combining the Lg‐wave attenuation within the crust. Weak Pn‐wave attenuation outlines the boundary of the Arabian Plate near the Moho discontinuity, extending further in the direction of underthrusting in the northwestern and southeastern regions. This is likely due to the up‐bending and underplating of the Arabian lithosphere following the cessation of slab pull. The overlying crusts in northwestern and southeastern Zagros thickened under the compressive force from plate underplating. The correlations among the surface Miocene‐Quaternary volcanism, strong Lg attenuation in the crust and strong Pn attenuation in the uppermost mantle suggest that asthenospheric materials escaped from slab windows and further intruded into the upper mantle and crust to feed the post‐collision volcanoes.

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Section: Discussionmentioning

confidence: 99%

Segmented Up‐Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography

Yang,

Chen,

Zhao

et al. 2023

JGR Solid Earth

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“…On the other hand, structural evidence revealed that the accretionary wedge of the Sistan suture zone is generated due to the eastward subduction of the Sistan Ocean beneath the Afghan block (Fotoohi Rad et al 2005; Angiboust et al 2013; Bonnet et al 2018). Jentzer et al (2020) believed that the Late Cretaceous subduction-related magmatism in the west of the Afghan block was formed due to the NE-dipping subduction of the Sistan oceanic lithosphere beneath the stretched margin of the Afghan block. In any case, the subduction of the Sistan oceanic lithosphere beneath the Afghan block could not supply the subduction components into the mantle beneath the EIMB.…”

Section: Discussionmentioning

confidence: 99%

Neo-Tethyan subduction triggered Eocene–Oligocene magmatism in eastern Iran

et al. 2022

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Eocene–Oligocene magmatic rocks are well exposed in the region south of Birjand, eastern Iran. The ages, geochemistry and petrogenesis of these rocks are important to understand eastern Iran’s magmatic and geodynamic history during the Cenozoic. Detailed field investigations show that numerous intrusive, intermediate to felsic units are intruded into a thick sequence of Eocene–Oligocene lava flows and their accompanying pyroclastic rocks. The volcanic rocks are mainly basaltic andesitic to rhyolitic, whereas intrusive rocks are characterized by dioritic to granitic composition. Previously compiled U–Pb geochronological data indicate that Eocene–Oligocene magmatism in eastern Iran formed continuously from ∼46 Ma to ∼25 Ma. Our new zircon U–Pb data reveal crystallization ages of 43.6 ± 0.4 Ma to 39.5 ± 0.6 Ma, consistent with the upper end of this age range. Geochemically, the igneous rocks have high-K calc-alkaline to shoshonitic signatures. Rare-earth and trace element patterns show enrichment in LREEs, K, Rb, Cs, Pb, Th and U and depletion in HFSEs such as Nb, Zr and Ti, typical of a subduction-related environment. 87Sr/86Sr(i) and ϵNd(i) values range from 0.7051 to 0.7064 and −0.1 to +0.2, respectively. We postulate that the Cretaceous northeastward subduction of the Neo-Tethyan oceanic lithosphere underneath the Iranian Plateau caused sub-continental lithospheric mantle (SCLM) metasomatism by slab-derived fluid components. Subsequently, slab roll-back of the Neo-Tethyan oceanic lithosphere associated with asthenospheric upwelling led to lithospheric thinning and melting of the metasomatized SCLM. The resulting parental magmas probably interacted with upper continental crust during magma ascent to form Eocene–Oligocene magmatism in eastern Iran.

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“…Adakitic granodiorites and A-type granites in the Ratuk Complex were emplaced in the Late Cretaceous and Early Eocene, respectively (Jentzer et al, 2020;Pang et al, 2013). These events were followed by widespread Eocene-Oligocene calc-alkaline volcanic activity.…”

Section: The Sistan Suture Zonementioning

confidence: 99%

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

Rezaei-Kahkhaei

Corfú

Galindo

et al. 2022

Lithos

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Late Cretaceous calc-alkaline and adakitic magmatism in the Sistan suture zone (Eastern Iran): Implications for subduction polarity and regional tectonics

Cited by 15 publications

References 85 publications

Segmented Up‐Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography

Segmented Up‐Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography

Neo-Tethyan subduction triggered Eocene–Oligocene magmatism in eastern Iran

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

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