Oligocene–Miocene geodynamic evolution of the central part of Urumieh-Dokhtar Arc of Iran

Ghorbani, Mohammad Reza; Graham, Ian T.; Ghaderi, Majid

doi:10.1080/00206814.2014.919615

Cited by 43 publications

(36 citation statements)

References 29 publications

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“…Richards () considers that Neo‐Tethys closure and continental collision most likely occurred in the Miocene, propagating diachronously from the Early Miocene in the northwest of Iran to the Late Miocene in the southeast. Ghorbani, Graham, and Ghaderi () reported Oligocene–Miocene volcanic rocks in the Tafresh have typical subduction‐related signature, and thus the presence of these volcanic rocks in the central UDMA clearly contradict models in favour of the Oligocene continental collision. The global synthesis of Miocene benthic foraminiferal carbon and oxygen isotopic and faunal abundance data from central Iran suggests that the Neo‐Tethys was not closed but remained connected to the northern Indian Ocean until 14 Ma (Woodruff & Savin, ).…”

Section: Discussionmentioning

confidence: 99%

“…Several N–S to NW–SE elongated dikes with mafic to intermediate compositions cut through the Eocene volcano‐sedimentary units. KAr dating on these dikes revealed an age of 15.4 ± 0.9 Ma (Ghorbani, Graham, & Ghaderi, ). The Eocene volcano‐sedimentary units are overlain by the Late Eocene‐Early Oligocene Lower Red Formation, consisting of conglomerate, sandstone, shale, and gypsum and minor pyroclastic deposits and volcanic flows.…”

Section: Introductionmentioning

confidence: 99%

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Tafresh intrusive rocks within the Urumieh‐Dokhtar Magmatic Arc: Appraisal of Neo‐Tethys subduction

et al. 2018

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This paper presents UPb zircon dating and element compositions for Miocene intrusive rocks in NE Tafresh situated in the central Urumieh‐Dokhtar Magmatic Arc. These intrusive rocks, consisting of granodiorite and diorite, were emplaced during the Early Miocene (19.07–20.37 Ma), following extensive submarine volcanic activity in the Eocene. In normalized multi‐element diagrams, all the analysed rocks are characterized by enrichments in large ion lithophile elements (e.g., Ba, Rb, and Sr) and depletions in high field strength elements (e.g., Nb, Ta, and Hf) and display geochemical features typical of subduction‐related calc‐alkaline arc magmas. The enrichment of light rare earth elements and flat heavy rare earth elements patterns reflect amphibole fractionation from relatively hydrous, calc‐alkalic magmas. The geochemical features and ages of the Tafresh intrusive rocks suggest that the Neo‐Tethys Ocean did not close completely in the region until the Miocene and is consistent with a diachronous collision starting in the NW and closing later in the SE.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tafresh intrusive rocks within the Urumieh‐Dokhtar Magmatic Arc: Appraisal of Neo‐Tethys subduction

et al. 2018

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“…Map of Iran showing the major structural units (modified after Alavi, ) as well as the distribution of Tertiary magmatic rocks in the central and southeast UDMA with compilation of published age data (Babazadeh et al, ; Berberian et al, ; Chiu et al, ; Dargahi, Arvin, Pan, & Babaei, ; Ghorbani et al, ; Hassanzadeh, ; Honarmand et al, ; Hosseini, Hassanzadeh, Alirezaei, Sun, & Li, ; Kouhestani et al, ; McInnes et al, , ; Pang et al, ; Sarjoughian & Kananian, ; Shahabpour, ; Shahsavari Alavijeh, Rashidnejad Omran, & Corfu, ; Verdel et al, ; Yeganehfar et al, Tables S1 and S2) and locations of the samples dated in the present study [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

Multistage tectono‐magmatic evolution of the central Urumieh–Dokhtar magmatic arc, south Ardestan, Iran: Insights from zircon geochronology and geochemistry

et al. 2018

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Combining high‐spatial resolution geochronology and geochemistry of zircon provides constraints on the geodynamic evolution of the Zagros orogen. This study underlines the significance of hitherto unknown magmatic/geological events in the central Urumieh–Dokhtar magmatic arc (UDMA) of Iran at ca. 35–22 and 10 Ma. Recently reported U–Pb zircon ages of 25–24 Ma for the granodioritic rocks from the south Ardestan area were interpreted to constrain the crystallization age. Newly determined U–Pb zircon ages of ca. 35 to 22 Ma from south Ardestan gabbroic to granitic rocks and related dikes indicate that the melt evolution continued from the Oligocene into Early Miocene time. In addition, a ca. 10 Ma U–Pb age for the zircons from a south Ardestan diorite provides evidence for a so far unknown, igneous episode. Representing the youngest magmatic stage recognized in the central part of the UDMA, the 10 Ma age is interpreted to document magmatic activity related to the Arabia–Eurasia collision, as recognized elsewhere in the Zagros orogen. South Ardestan zircons with geochemical signatures indicating continental affinity likely recrystallized in the course of a major event (asthenospheric mantle melt formation) that has affected crustal rocks. The significant lower LREEs of these zircons compared to hydrothermal zircons, moderate Th/U (>0.4), and high (Sm/La)N (>10) ratios associated with low [La] (<1 ppm) suggest that these crystals have an igneous origin and are not related to hydrothermal or metamorphic processes. These findings bear important implications for the geodynamic evolution of the Zagros orogen and support a model suggesting that magmatic activity still affected the UDMA in Late Miocene time.

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“…The geology of West Nain has been studied by researchers in the past (e.g. Amidi, 1975;Yeganehfar et al, 2012;Ghorbani et al, 2014). In the Kajan area (Fig.…”

Section: Regional Geology Of Kajan Areamentioning

confidence: 99%

“…Alavi, 2004;Kananian et al, 2014;Yeganehfar 2012;Dargahi et al, 2010;Aghazadeh et al, 2011;Ghorbani et al, 2014;Rezaei-Kahkhaei et al, 2011;Honarmand et al, 2013 and. The UDMA volcanic zone of Schroder (1944) or the Urumieh-Dokhtar magmatic assemblage of Alavi (2004) has been 3 interpreted to be a subduction related Andean-type magmatic arc that has been active from the Late Jurassic to the present (Berberian and King, 1981;Berberian et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis and geodynamic evolution of the Kajan Neogene subvolcanic rocks, Nain, Central Iran

et al. 2016

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Oligocene–Miocene geodynamic evolution of the central part of Urumieh-Dokhtar Arc of Iran

Cited by 43 publications

References 29 publications

Tafresh intrusive rocks within the Urumieh‐Dokhtar Magmatic Arc: Appraisal of Neo‐Tethys subduction

Tafresh intrusive rocks within the Urumieh‐Dokhtar Magmatic Arc: Appraisal of Neo‐Tethys subduction

Multistage tectono‐magmatic evolution of the central Urumieh–Dokhtar magmatic arc, south Ardestan, Iran: Insights from zircon geochronology and geochemistry

Petrogenesis and geodynamic evolution of the Kajan Neogene subvolcanic rocks, Nain, Central Iran

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