Rapid Eocene extension in the Chapedony metamorphic core complex, Central Iran: Constraints from 40Ar/39Ar dating

Kargaranbafghi, Fariba; Neubauer, Franz; Genser, Johann

doi:10.1016/j.jseaes.2015.03.010

Cited by 23 publications

(11 citation statements)

References 67 publications

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“…Available geochronological data frame the oceanic crust generation and destruction in the back-arc domain during the Cretaceous-Palaeocene times (Bröcker et al, 2013;Rossetti et al, 2010Rossetti et al, , 2014Shafaii Moghadam et al, 2013;Shafaii Moghadam et al, 2009Zarrinkoub et al, 2012). Furthermore, a period of Cretaceous to Palaeocene contraction is regionally documented by field evidence Berberian & King, 1981;Şengör, 1990;Stocklin, 1968) and supported by thermochronological results (Kargaranbafghi, Neubauer, & Genser, 2015;Verdel et al, 2007).…”

Section: Geological Backgroundmentioning

confidence: 88%

“…A stage of core-complex extension associated with magmatic flare-up is documented during the middle Eocene times in Central Iran (at ca. 45-40 Ma;Kargaranbafghi et al, 2012Kargaranbafghi et al, , 2015Shafaii Moghadam et al, 2016;Verdel et al, 2007;Verdel, Wernicke, Hassanzadeh, & Guest, 2011). This is followed and overprinted by renewed shortening, commonly associated with continental collision, estimated to have started at the Eocene-Oligocene boundary (e.g., Allen & Armstrong, 2008;François et al, 2014;Hafkenscheid et al, 2006;Hessami et al, 2001;Homke et al, 2009Homke et al, , 2010Kargaranbafghi et al, 2012;Madanipour et al, 2013;McQuarrie et al, 2003;Mouthereau et al, 2012;Robertson et al, 2006;Vincent et al, 2007).…”

Section: Geological Backgroundmentioning

confidence: 99%

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The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

et al. 2018

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A better understanding of intraplate deformation requires the knowledge of the space–time scales involved in its development and to decipher possible links with the dynamic evolution of the plate boundaries. Central Iran provides an ideal test site to approach this scientific issue, since it is characterised by a prolonged history of Mesozoic–Cenozoic intraplate deformation that has been interfering with the spatio‐temporal re‐organization of the Zagros convergence zone along the Eurasia plate boundary. This study focus on the Doruneh Fault (DF) region that is considered as the northern mechanical boundary of the Central East Iranian Microcontinent. By combining field investigations with apatite low‐temperature thermochronology, we present a revised tectono‐stratigraphic scenario for the DF region, typified by a punctuated history of fault‐related exhumation, burial and cooling history back to the Upper Cretaceous. When framed at regional scale, these results attest that the Zagros convergence zone, and its hinterland domain were fully mechanically coupled since ca. 40–35 Ma, a time lapse that is here referred as to the onset of continental collision along the Arabia–Eurasia plate boundary. In this scenario, the DF region operated throughout the Cenozoic as a major zone of residual stress accommodation and transfer in the hinterland domain of the Zagros convergence zone. Results of this study also suggest that the tectonic evolution along the Arabia–Eurasia plate boundary was modulated by the plate‐boundary dynamics and by the modes of tectonic reactivation of the intracontinental weak zones of Central Iran and at its tectonic boundaries.

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Section: Geological Backgroundmentioning

confidence: 88%

Section: Geological Backgroundmentioning

confidence: 99%

The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

et al. 2018

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“…The Cenozoic deformation history of the UDMZ is relatively complex, involving multiple stages of extension and shortening with strike-slip deformation. The Early to Middle Eocene is characterized by backarc extension and metamorphic core complex development synchronous with UDMZ magmatism (Kargaranbafghi et al, 2015;Verdel, 2007;Verdel et al, 2011), followed by a phase of Late Eocene inversion and beveling of the Eocene arc (Morley et al, 2009). This was later overprinted by a broad Oligo-Miocene retroforeland flexural or sag basin with local transtensional strain (Ballato et al, 2011;Morley et al, 2009).…”

Section: Udmzmentioning

confidence: 99%

Cenozoic Exhumation and Foreland Basin Evolution of the Zagros Orogen During the Arabia‐Eurasia Collision, Western Iran

et al. 2018

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Cenozoic exhumation patterns in the internal and external Zagros reveal a long‐term deformation record associated with geodynamic restructuring of Arabia‐Eurasia collisional zone from continental subduction to plate suturing, which can be evaluated from thermochronometric, provenance, and subsidence analyses. Thermal modeling of zircon and apatite (U‐Th)/He ages and apatite fission track data from the Sanandaj‐Sirjan Zone (SSZ) indicates exhumation and inferred uplift along the leading edge of Eurasia starting in the Late Eocene (~35 Ma), coeval with initial foreland flexural subsidence of Arabia. Together with deceleration in Arabia‐Eurasia convergence and diminished subduction‐related magmatism, these events signal the final Neotethys closure and onset of long‐term (15–20 Myr) Arabian continental subduction beneath Eurasia, facilitated by the attenuated architecture of the precollisional Arabian margin. From 35 to 20 Ma, crustal shortening was relatively subdued and restricted to areas along the Arabia‐Eurasia plate boundary and diffuse inversion structures within continental interiors. Acceleration in SSZ cooling/exhumation rates from 19 to 16 Ma was synchronous with rapid basin subsidence and clastic progradation in the Zagros foreland. These events were contemporaneous with 20‐ to 16‐Ma surge in calc‐alkaline magmatism in central Iran and may have been linked to reorganization/deflection of Arabian plate vectors during the main phase of Red Sea rifting at 19–18 Ma. Transition from continental subduction to Arabia‐Eurasia suturing by ~12 Ma forced a transfer of strain from the subduction zone to intraplate deformational structures. This was marked by rapid outward expansion of the Zagros orogen, involving a shift in exhumation from the SSZ to Zagros fold‐thrust belt and Iranian plate interior.

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“…the Koshoumi granite and Daranjir Diorite) dated between 40 and 49 Ma (Ramezani and Tucker, 2003;Verdel et al, 2007). The Chapedony Metamorphic Complex includes high-grade gneisses, migmatites and anatectic granites (Haghipour et al, 1977a) with peak metamorphism at approximately 46 Ma (Ramezani and Tucker, 2003) and Ar-Ar ages for various minerals ranging from 40 to 48 Ma (Verdel et al, 2007;Kargaranbafghi et al, 2012Kargaranbafghi et al, , 2015. Late-to post-metamorphic intrusion of granite-diorite plutons into the complex were dated at approximately 45 Ma (U-Pb zircon; Ramezani and Tucker, 2003).…”

Section: Kashmar-kerman Tectonic Zonementioning

confidence: 99%

Cimmerian metamorphism and post Mid-Cimmerian exhumation in Central Iran: Insights from in-situ Rb/Sr and U/Pb dating

Gyomlai

Agard

Jolivet

et al. 2022

Journal of Asian Earth Sciences

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Rapid Eocene extension in the Chapedony metamorphic core complex, Central Iran: Constraints from 40Ar/39Ar dating

Cited by 23 publications

References 67 publications

The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

Cenozoic Exhumation and Foreland Basin Evolution of the Zagros Orogen During the Arabia‐Eurasia Collision, Western Iran

Cimmerian metamorphism and post Mid-Cimmerian exhumation in Central Iran: Insights from in-situ Rb/Sr and U/Pb dating

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