Eocene–Oligocene post-collisional magmatism in the Lut–Sistan region, eastern Iran: Magma genesis and tectonic implications

Pang, Kwan‐Nang; Chung, Sun‐Lin; Zarrinkoub, Mohammad Hossein; Khatib, Mohammad Mahdi; Mohammadi, Seyyed Saeid; Chiu, Han-Pang; Chu, Chih‐Liang; Lee, Hao‐Yang; Lo, Ching–Hua

doi:10.1016/j.lithos.2013.05.009

Cited by 126 publications

(74 citation statements)

References 77 publications

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“…Subsequent to the closure, the Sistan region was affected by a period of extensive magmatic activity in the Middle Eocene -Late Oligocene (Pang et al 2013). Basaltic -rhyolitic volcanic and sub-volcanic rocks accompanied by minor intrusions clearly postdate the closure of the Sistan Ocean: therefore, a relationship to subduction is unlikely.…”

Section: The Sistan Suture Zonementioning

confidence: 99%

“…Basaltic -rhyolitic volcanic and sub-volcanic rocks accompanied by minor intrusions clearly postdate the closure of the Sistan Ocean: therefore, a relationship to subduction is unlikely. Pang et al (2013) proposed a model in which post-orogenic collapse of the eastern Iran ranges and lithosphere thinning in an extensional regime caused the 'flare-up' of widespread calc-alkaline magmatism.…”

Section: The Sistan Suture Zonementioning

confidence: 99%

“…In the south, the accretionary wedge of the active Makran northward subduction of the Arabian Plate engirdles the southern promontory of the Afghan Cimmerides. The Afghan orogenic segment is bounded to the west by the Sistan suture zone of Late Cretaceous -Early Tertiary age in the east Iran ranges (Tirrul et al 1983;Saccani et al 2010;Zarrinkoub et al 2012;Pang et al 2013).…”

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confidence: 99%

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Structural setting and evolution of the Afghan orogenic segment – a review

Siehl

2015

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The actual state of knowledge concerning the tectonic evolution of the Afghan orogenic segment is summarized in the context of the neighbouring regions. The segment can be divided into: (1) the Late Palaeozoic North Afghan Variscan domain, which forms the southern margin of the Turan Plate; (2) the Early Cimmerian (Late Triassic-Early Jurassic) Palaeotethys suture zone of Middle Afghanistan, with the associated magmatic arc and back-arc rift extending from the Parapamisos and western Hindu Kush to the northern Pamir Mountains; (3) the Late Cimmerian (Late Jurassic-Early Cretaceous) domain of the Central Afghan Block mosaic with Gondwanaderived terranes; and (4) the Cenozoic-age Himalayan domain, which fringes the Cimmerian domain along the transpressive boundary of the Indian Plate in the east and the accretionary complex of the Makran subduction zone in the south. This current review of the scattered literature of a country where geological fieldwork effectively ceased 35 years ago is intended to bridge the gap between the better-known regions to the west in eastern Iran, and to the east in the Pamir-Punjab syntaxis.

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Section: The Sistan Suture Zonementioning

confidence: 99%

Section: The Sistan Suture Zonementioning

confidence: 99%

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confidence: 99%

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Structural setting and evolution of the Afghan orogenic segment – a review

Siehl

2015

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“…Early Eocene A-type granites were emplaced in the suture zone (Zarrinkoub et al 2010). Eocene-Oligocene calc-alkaline volcanic rocks are widespread in the suture zone and to the west in the Lut block, and could have resulted from asthenosphere-lithosphere interaction and convective removal of thickened lithospheric root in a post-collisional setting (Pang et al 2013). Miocene to Quaternary alkali basalts are mostly associated with active, ∼N-S dextral strike-slip systems in the Sistan region, i.e., the NSZ (Walker et al 2009;Pang et al 2012).…”

Section: The Sistan Suture Zonementioning

confidence: 99%

Late Cretaceous evolution of the northern Sistan suture zone, eastern Iran: Implications of magnetic fabrics and microstructures in the Bibi Maryam granitoid

2015

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Anisotropy of magnetic susceptibility (AMS) survey supported by field and microstructural studies have been applied on the Late Cretaceous Bibi Maryam granitoid (BMG) in the northern Sistan suture zone (SSZ), east of Iran. The BMG is composed of quartzdiorite-tonalite with late granodiorite dykes and stocks that are surrounded by steeply SW-dipping Neh shear zone (NSZ). The magmatic fabrics are characterized by transpressional environment dominated by steep dipping foliations (mean strike: N13 • W) and sub-horizontal stretching lineations (mean trend: 167 • ). Based on microstructural studies, it is inferred that these fabrics are related to emplacement and cooling of the pluton and the internal fabrics revealed are evidence of a deformation continuum in the granitoid from magmatic to solid state. Deformation in the region continued even after the BMG had fully crystallized, which led to development of the NW-SE foliations and lineation trend that these fabrics are subparallel with the NSZ. The BMG has emplaced in a transpressional setting that was controlled by a NW-SE stretching direction and supported the model that has proposed the relationship between granitoid emplacement and oblique intra-oceanic subduction of the Neotethys during the Late Cretaceous already recognized in this part of the SSZ.

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“…The subsequent, widespread calc-alkaline volcanism that was emplaced from the middle Eocene to late Oligocene (ca. 45-25 Ma) not only within the suture zone but also to the west in the Lut block [25]. In this study, the power spectral method is applied to aeromagnetic data from Lut block with the aim of estimating depths to the Curie isotherm surface (Fig.…”

Section: Discussionmentioning

confidence: 99%

Geodynamics and underlying bedrock of the magnetically active crust layer of the Lut block, Eastern Iran

et al. 2016

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Abstract⎯The Curie point depth map of Eastern Iran was constituted from spectral analysis of the aeromagnetic data. The reduction to pole (RTP) was applied to the magnetic anomaly data. The Curie point depth values from 165 overlapping blocks, 100 × 100 km in size, have been estimated. The Curie point depth method provides a relationship between the 2-D FFT power spectrum of the magnetic anomalies and the depth of magnetic sources by transforming the spatial data into the frequency domain. The centroid and top depth of the magnetic sources (respectively Z 0 and Z t ) is calculated from radially averaged log power spectrum for each block. Finally, the Curie point depth of Eastern Iran is obtained by Z b = 2Z 0 -Z t . The highest value of 24 km is located in eastern and western boundaries of the Lut block, and the lowest value of 12 km is located at north of study area. The shallow depths in the Curie-point depth map are well correlated with the young volcanic areas and geothermal potential fields. Geothermal gradient ranging from 24 to 45°C/km. The deduced thermal structure in eastern Iran has a relationship with orogenic collapse associated with delamination of thickened lithospheric root between the Lut and Afghan continental blocks.

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Eocene–Oligocene post-collisional magmatism in the Lut–Sistan region, eastern Iran: Magma genesis and tectonic implications

Cited by 126 publications

References 77 publications

Structural setting and evolution of the Afghan orogenic segment – a review

Structural setting and evolution of the Afghan orogenic segment – a review

Late Cretaceous evolution of the northern Sistan suture zone, eastern Iran: Implications of magnetic fabrics and microstructures in the Bibi Maryam granitoid

Geodynamics and underlying bedrock of the magnetically active crust layer of the Lut block, Eastern Iran

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