The Crustal Structure in Southern Iran Derived from Seismic Explosion Data

Giese, P.; Makris, J.; Akashe, B.; Röwer, P.; Letz, H.; Mostaanpour, M.

doi:10.1127/njgpa/168/1984/230

Cited by 21 publications

(13 citation statements)

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“…He presumed that all metamorphic units and volcanic‐bearing post‐Triassic strata, including the Hamadan phyllites, are “allochthonous.” The stratigraphic and intrusive superposition of the extensive calc‐alkaline Jurassic volcanics and intrusives of the SSA with pre‐Jurassic rocks, including intrusive relationships of arc batholiths into the pre‐Jurassic substrate (e.g., Figure ), and stratigraphic and structural continuity across the Triassic‐Jurassic boundary reported in many previous studies [e.g., Zahedi , ; Berberian and Berberian , ; Kazmin et al ., ] are not accounted for in the model. Alavi [] also suggested that the thick crust and relatively high mean elevation of the SSA were caused by south directed imbrication of up to 15 km of nappes composed of fragments of the Cretaceous and younger arc (Figure a), as opposed to underthrusting of the leading edge of the Arabian plate advocated by most workers [e.g., Bird et al ., ; Giese et al ., ; Paul et al ., ; Allen et al ., ].…”

Section: Discussionmentioning

confidence: 77%

“…Early estimates of crustal thickness of the Iranian Plateau beneath the SSA of up to 64 km have been interpreted to indicate a doubling of the crustal thickness from south to north across the Zagros suture [e.g., Dehghani and Makris , ; Giese et al ., , Figure 7]. More recently, several seismic imaging projects across the Zagros orogen were attempted to test the hypothesis of a thick crustal root beneath the SSA.…”

Section: Tectonic Settingmentioning

confidence: 99%

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The Neotethyan Sanandaj‐Sirjan zone of Iran as an archetype for passive margin‐arc transitions

2016

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The Sanandaj-Sirjan zone of Iran is a northwest trending orogenic belt immediately north of the Zagros suture, which represents the former position of the Neotethys Ocean. The zone contains the most extensive, best preserved record of key events in the formation and evolution of the Neotethys, from its birth in Late Paleozoic time through its demise during the mid-Tertiary collision of Arabia with Eurasia. The record includes rifting of continental fragments off of the northern margin of Gondwanaland, formation of facing passive continental margins, initiation of subduction along the northern margin, and progressive development of a continental magmatic arc. The latter two of these events are critical phases of the Wilson Cycle that, elsewhere in the world, are poorly preserved in the geologic record because of superimposed events. Our new synthesis reaffirms the similarity between this zone and various terranes to the north in Central Iran. Late Paleozoic rifting, preserved as A-type granites and accelerated subsidence, was followed by a phase of pronounced subsidence and shallow marine sedimentation in Permian through Triassic time, marking the formation and evolution of passive margins on both sides of the suture. Subduction and arc magmatism began in latest Triassic/Early Jurassic time, culminating at~170 Ma. The extinction of arc magmatism in this zone, and its shift northeastward to form the subparallel Urumieh-Dokhtar arc, occurred diachronously along strike, in Late Cretaceous or Paleogene time. Post-Cretaceous uplift transformed the zone from a primarily marine borderland into a marine archipelago that persisted until mid-Tertiary time.

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Section: Discussionmentioning

confidence: 77%

Section: Tectonic Settingmentioning

confidence: 99%

The Neotethyan Sanandaj‐Sirjan zone of Iran as an archetype for passive margin‐arc transitions

2016

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“…Giese et al (1984) report on refraction profiles recorded from quarry blast sources in southeastern Zagros, but their conclusions are not supported by reverse profiles and the data quality is poor. Hatzfeld et al (2003) used receiver function analysis from earthquake records to infer a crustal thickness of ~46 km beneath a single station in Central Zagros.…”

Section: Previous Data On Zagros Lithospheric Structurementioning

confidence: 99%

Seismic imaging of the lithospheric structure of the Zagros mountain belt (Iran)

et al. 2010

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“…There are few studies of the crustal velocity structure of the Iranian plateau. A refraction profile consisting of sparse recordings along a line from central Iran to the Strait of Hormuz (Giese et al 1984) shows arrivals of questionable quality identified as Moho reflections and indicating a crustal thickness of 40 km beneath central Iran. Using receiver function analysis Hatzfeld et al (2003) find the crust in the central Zagros to be 44–48 km thick.…”

Section: Introductionmentioning

confidence: 99%

Surface waveform tomography of the Turkish-Iranian plateau

Maggi

Priestley

2005

Geophysical Journal International

195

131

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SUMMARY The Middle East is a tectonically complex region consisting of terrains as diverse as Precambrian shields and young orogens. The dominant tectonic feature is the Turkish–Iranian plateau, a recently elevated, seismically active region along the Zagros–Bitlis suture, which results from the collision of the Arabian Plate with Eurasia. In this study, we use surface waveform tomography to elucidate the upper‐mantle shear wave velocity structure beneath the Turkish–Iranian plateau and adjacent regions. The main large‐scale feature in the tomographic model is a low shear wave velocity anomaly in the uppermost mantle beneath the plateau. This low‐velocity feature correlates with a long‐wavelength free‐air gravity anomaly and with recent volcanism whose geochemistry has a lower lithospheric mantle signature. Seismology, gravity and volcanism all suggest the presence of a thin lithosphere and warm upper mantle beneath the Turkish–Iranian plateau. The upper‐mantle low shear wave velocity zone, the high free‐air gravity and the deep lithospheric source depth for the basaltic volcanism are all consistent with a partial delamination of the lithosphere as a result of earlier lithospheric thickening resulting from the continental collision.

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The Crustal Structure in Southern Iran Derived from Seismic Explosion Data

Cited by 21 publications

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The Neotethyan Sanandaj‐Sirjan zone of Iran as an archetype for passive margin‐arc transitions

The Neotethyan Sanandaj‐Sirjan zone of Iran as an archetype for passive margin‐arc transitions

Seismic imaging of the lithospheric structure of the Zagros mountain belt (Iran)

Surface waveform tomography of the Turkish-Iranian plateau

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