Island-arc affinity of the Central Iranian Volcanic Belt

Shahabpour, J.

doi:10.1016/j.jseaes.2007.02.004

Cited by 138 publications

(81 citation statements)

References 31 publications

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“…a change in slab dip; Shahabpour, 2007;Omrani et al 2008) and, alternatively, to the existence of two distinct subduction zones (Azizi & Moinvaziri 2009). Nevertheless, the existence of two Tertiary magmatic belts (UDMA and AMB; Fig.…”

Section: A Overview Of the Tertiary Magmatism Of The Alborz Mountamentioning

confidence: 99%

Post-collisional polycyclic plutonism from the Zagros hinterland: the Shaivar Dagh plutonic complex, Alborz belt, Iran

et al. 2011

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-The petrological and geochronological study of the Cenozoic Shaivar Dagh composite intrusion in the Alborz Mountain belt (NW Iran) reveals important clues to decipher complex relations between magmatic and tectonic processes in the central sectors of the Tethyan (Alpine-Himalayan) orogenic belt. This pluton is formed by intrusion at different times of two main magmatic cycles. The older (Cycle 1) is formed by calc-alkaline silicic rocks, which range in composition from diorites to granodiorites and biotite granites, with abundant mafic microgranular enclaves. The younger cycle (Cycle 2) is formed by K-rich monzodiorite and monzonite of marked shoshonitic affinity. The latter form the larger volumes of the exposed plutonic rocks in the studied complex. Zircon geochronology (laser ablation ICP-MS analyses) gives a concordia age of 30.8 ± 2.1 Ma for the calc-alkaline rocks (Cycle 1) and a range from 23.3 ± 0.5 to 25.1 ± 0.9 Ma for the shoshonitic association (Cycle 2). Major and trace element relations strongly support distinct origins for each magmatic cycle. Rocks of Cycle 1 have all the characteristic features of active continental margins. Shoshonitic rocks (Cycle 2) define two continuous fractionation trends: one departing from a K-rich basaltic composition and the other from an intermediate, K-rich composition. A metasomatized-mantle origin for the two shoshonitic series of Cycle 2 is proposed on the basis of comparisons with experimental data. The origin of the calc-alkaline series is more controversial but it can be attributed to processes in the suprasubduction mantle wedge related to the incorporation of subducted mélanges in the form of silicic cold plumes. A time sequence can be established for the processes responsible of the generation of the two magmatic cycles: first a calc-alkaline cycle typical of active continental margins, and second a K-rich cycle formed by monzonites and monzodiorites. This sequence precludes the younger potassic magmas as precursors of the older calc-alkaline series. By contrast, the older calc-alkaline magmas may represent the metasomatic agents that modified the mantle wedge during the last stages of subduction and cooked a fertile mantle region for late potassic magmatism after continental collision.

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Section: A Overview Of the Tertiary Magmatism Of The Alborz Mountamentioning

confidence: 99%

Post-collisional polycyclic plutonism from the Zagros hinterland: the Shaivar Dagh plutonic complex, Alborz belt, Iran

et al. 2011

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“…4C) and had been active since the Jurassic (see Sanandaj-Sirjan Tract above). It generated Late Cretaceousearly Paleocene Andean-type continental arc magmatism that propagated over time from the southeast to the northwest across northwestern Iran and southeastern Turkey (Azizi and Jahangiri, 2008;Shahabpour, 2005Shahabpour, , 2007Şengör and Yilmaz, 1981;Şengör and others, 1993). This volcano-plutonic event is known as the Baskil Arc (Kuşcu and others, 2010) or Border Folds Arc (Yigit, 2009).…”

Section: Tectonic Settingmentioning

confidence: 99%

“…Late Cretaceous-early Paleocene compression was followed by pronounced back-arc extension and magmatism (Alavi, 1994;Shahabpour, 2007;Omrani and others, 2008;Agard and others, 2011;Verdel and others, 2011). This event deposited voluminous largely subaqueous late Paleocene to middle Eocene calc-alkaline to shoshonitic rocks (see Anatolide-Tauride-Eastern Turkey-Caucasus sub-tract above and Esfahan tract below) and widespread subaqueous to subaerial late Oligocene-early Miocene calc-alkaline to alkaline rocks (see Azerbaijan-Eastern Turkey sub-tract below).…”

Section: Tectonic Settingmentioning

confidence: 99%

“…One known porphyry copper prospect of Latest Miocene to Holocene age is included in this part of the sub-tract. However, as many as five other porphyry and porphyry-related acid-sulfate systems are possibly also related to this postcollisional magmatic event (Biabangard and others, 2011;Shahabpour, 2007;Parsapoor and others, 2009). …”

Section: Central and Southeastern Iranmentioning

confidence: 99%

“…Collision and closure of the Southern Neotethys Ocean Branch in this region occurred earlier than in the west and east, because of the impinging geometry of the Arabian Platform. Collision was superseded by renewed late Oligocene to middle Miocene extension, subsidence, and formation of deep sedimentary basins across much of the preexisting extensional setting that had formed from eastern Turkey to central Iran (Morley and others, 2009;Reuter and others, 2009;Shahabpour, 2005Shahabpour, , 2007. Mantleinvolved tectono-magmatic processes, including slab break-off and asthenospheric upwelling, are believed to have played a major role in generating this extensional regime and related magmatism others, 2010, 2011;Azizi and Moinevaziri, 2009;Dilek and others, 2010).…”

Section: Late Eocene To Middle Miocenementioning

confidence: 99%

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Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in <i>Global mineral resource assessment</i>

Zürcher¹,

Bookstrom²,

Hammarstrom³

et al. 2015

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS (1-888-275-8747).For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod.To order this and other USGS information products, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report.Suggested citation: Zürcher, L., Bookstrom A.A., Hammarstrom, J.M., Mars, J.C., Ludington, S., Zientek, M.L., Dunlap, P., and Wallis, J.C., with contributions from Drew, L.J., Sutphin, D.M., Berger, B.R., Herrington, R.J., Billa, M., Kuşcu, I., Moon, C.J. ,and Richards, J.P., 2015, Porphyry copper assessment of the Tethys region of western and southern Asia: U.S. Geological Survey Scientific Investigations Report 2010-5090-V, 232 p., and spatial data, http://dx.doi.org/10.3133/sir20105090V. AbstractA probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in the

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Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

et al. 2017

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Uplift of the Al Hajar Mountains in Oman has been related to either Late Cretaceous ophiolite obduction or the Neogene Zagros collision. To test these hypotheses, the cooling of the central Al Hajar Mountains is constrained by 10 apatite (U‐Th)/He (AHe), 15 fission track (AFT), and four zircon (U‐Th)/He (ZHe) sample ages. These data show differential cooling between the two major structural culminations of the mountains. In the 3 km high Jabal Akhdar culmination AHe single‐grain ages range between 39 ± 2 Ma and 10 ± 1 Ma (2σ errors), AFT ages range from 51 ± 8 Ma to 32 ± 4 Ma, and ZHe single‐grain ages range from 62 ± 3 Ma to 39 ± 2 Ma. In the 2 km high Saih Hatat culmination AHe ages range from 26 ± 4 to 12 ± 4 Ma, AFT ages from 73 ± 19 Ma to 57 ± 8 Ma, and ZHe single‐grain ages from 81 ± 4 Ma to 58 ± 3 Ma. Thermal modeling demonstrates that cooling associated with uplift and erosion initiated at 40 Ma, indicating that uplift occurred 30 Myr after ophiolite obduction and at least 10 Myr before the Zagros collision. Therefore, this uplift cannot be related to either event. We propose that crustal thickening supporting the topography of the Al Hajar Mountains was caused by a slowdown of Makran subduction and that north Oman took up the residual fraction of N‐S convergence between Arabia and Eurasia.

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Island-arc affinity of the Central Iranian Volcanic Belt

Cited by 138 publications

References 31 publications

Post-collisional polycyclic plutonism from the Zagros hinterland: the Shaivar Dagh plutonic complex, Alborz belt, Iran

Post-collisional polycyclic plutonism from the Zagros hinterland: the Shaivar Dagh plutonic complex, Alborz belt, Iran

Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in <i>Global mineral resource assessment</i>

Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

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