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

Gyomlai, Thomas; Agard, Philippe; Jolivet, Laurent; Larvet, Tiphaine; Bonnet, Guillaume; Omrani, Jafar; Larson, Kyle P.; Caron, B.; Noël, Julie

doi:10.1016/j.jseaes.2022.105242

Cited by 10 publications

(5 citation statements)

References 121 publications

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“…Furthermore, in situ Rb/Sr dating recently yielded precise and accurate cooling ages ranging from 170 to 140 Ma that document the exhumation of Central Iran from the Mid-Cimmerian Event onward (Gyomlai et al . 2022) and provided a temporal link to the succeeding Late Cimmerian tectonics (Wilmsen et al . 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Fürsich et al 2009a;Taheri et al 2009) as well as the neighboring Afghan-Tajik Basin, which suggests a largely synchronous tectonic activity (Fürsich et al 2017). Furthermore, in situ Rb/Sr dating recently yielded precise and accurate cooling ages ranging from 170 to 140 Ma that document the exhumation of Central Iran from the Mid-Cimmerian Event onward (Gyomlai et al 2022) and provided a temporal link to the succeeding Late Cimmerian tectonics ).…”

Section: D Palaeogeographic Implicationsmentioning

confidence: 93%

“…Within this context, the lower Middle Jurassic Hojedk Formation of the uppermost Shemshak Group of east-central Iran has been postulated to indicate inter-regional tectonic instability, uplift and erosion due to syn-depositional block-faulting (Fürsich et al 2009a), shown by the vast thicknesses as well as rapid lateral facies and thickness variations in different parts of east-central Iran, including the northern Tabas Block (Wilmsen et al 2009b). This essentially early Bajocian unit also reflects a short-term subsidence pulse and was deposited in c. 1.5 Ma on the way to the Mid-Cimmerian tectonic event (Salehi et al 2018), which is reflected by a conspicuous unconformity surface associated with regional block-faulting and folding as well as widespread erosion in different parts of Iran (Wilmsen et al 2003(Wilmsen et al , 2009bFürsich et al 2009a), followed by widespread post-Mid-Cimmerian exhumation in Central Iran (Gyomlai et al 2022). However, despite its obvious tectono-stratigraphic significance, the Hojedk Formation has received little attention with respect to detailed facies analyses and palaeogeographic reconstructions, in marked contrast to the underlying siliciclastic successions of the Upper Triassic and Lower Jurassic part of the Shemshak Group of east-central Iran (Nayband and Ab-e-Haji formations) that have been studied in considerable detail (Fürsich et al 2005a;Salehi et al 2014Salehi et al , 2018Zamanian et al 2021).…”

Section: Introductionmentioning

confidence: 98%

“…2009 a ), followed by widespread post-Mid-Cimmerian exhumation in Central Iran (Gyomlai et al . 2022). However, despite its obvious tectono-stratigraphic significance, the Hojedk Formation has received little attention with respect to detailed facies analyses and palaeogeographic reconstructions, in marked contrast to the underlying siliciclastic successions of the Upper Triassic and Lower Jurassic part of the Shemshak Group of east-central Iran (Nayband and Ab-e-Haji formations) that have been studied in considerable detail (Fürsich et al .…”

Section: Introductionmentioning

confidence: 99%

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Depositional and thermal history of a continental, coal-bearing Middle Jurassic succession from Iran: Hojedk Formation, northern Tabas Block

SALEHI

Wilmsen²,

Zamanian³

et al. 2022

Geol. Mag.

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During the early Bajocian, a conspicuous coal-bearing siliciclastic succession was deposited in the northern Tabas Bock, which is important for understanding the regional geodynamics of the Central-East Iranian Microcontinent (CEIM) as well as for the Jurassic coal genesis in this part of Laurasia. Sedimentary facies analysis in a well-exposed section of the lower Bajocian Hojedk Formation (Kalshaneh area, northern Tabas Block) led to the recognition of ten characteristic sedimentary facies and three facies associations, representing channels with point bars and floodplains of a Bajocian meandering river system. Modal analysis indicates that the mature quartz arenites and quartzo-lithic sandstones of the Hojedk Formation originated from the erosion and recycling of older, supracrustal sedimentary rocks on the Yazd Block to the west. The coal petrography and maturity show an advanced maturation stage, whereas the great thickness of these continental strata points to a pronounced extension-related subsidence in the northern Tabas Block. The rapid rate of differential subsidence can be explained by accelerated normal block-faulting in the back-arc extensional basin of the CEIM, facing the Neotethys to the south. Compared to the thick Jurassic, the post-Jurassic strata are relatively thin and played a limited role in the thermal history of the coal in the northern Tabas Block. A relatively high geothermal gradient in the tectonically highly mobile area of the northern Tabas Block and/or heating by regionally widespread Palaeogene intrusions were most probably the key drivers of the thermal maturation of the Middle Jurassic coals.

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Section: Discussionmentioning

confidence: 99%

Section: D Palaeogeographic Implicationsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Depositional and thermal history of a continental, coal-bearing Middle Jurassic succession from Iran: Hojedk Formation, northern Tabas Block

SALEHI

Wilmsen²,

Zamanian³

et al. 2022

Geol. Mag.

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“…Rb‐Sr in‐situ analyses were performed at the ALIPP6 lab (ISTeP, Sorbonne University, Paris) using an Excimer 193 nm Analyte G2 Teledyne laser ablation system with an Agilent 8900 triple‐quadrupole ICP‐MS/MS coupled with a reaction cell ORS 4 . The acquisition protocol is described in Gyomlai et al (2022) and summarized in Appendix S1. Analyses were performed with 50 μm spots at 8 Hz and applying a fluence of ca.…”

Section: Methodsmentioning

confidence: 99%

Hygrochronometry of punctuated metasomatic events during exhumation of the Cycladic blueschist unit (Syros, Greece)

et al. 2022

Self Cite

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The spatiotemporal scales at which fluid flow events occur along the subduction interface remain poorly constrained. This study illustrates the benefit of using in‐situ Rb/Sr dating on metasomatic white mica to constrain the timing of metasomatic events, taking advantage of the well‐studied reaction zones of the Kampos‐Lia unit of Syros, Greece. This unit is a subducted block‐in‐matrix structure corresponding to a preserved fragment of a discontinuous, slow‐spreading oceanic domain. Results reveal that the main metasomatic event took place at ~36 Ma, coincident with the transition from blueschist to greenschist facies and syn‐ to post‐orogenic exhumation in the Cyclades marking the end of a first exhumation stage along the subduction interface. Results highlight that fluid–rock interaction along the subduction interface cannot be treated as the result of continuous fluid influx, but rather reflect punctuated, heterogeneously distributed events (both in time and space) tied to specific tectonometamorphic episodes.

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In situ Rb–Sr and 40Ar–39Ar dating of distinct mica generations in the exhumed subduction complex of the Western Alps

Gyomlai,

Agard,

Herviou

et al. 2023

Contrib Mineral Petrol

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

Cited by 10 publications

References 121 publications

Depositional and thermal history of a continental, coal-bearing Middle Jurassic succession from Iran: Hojedk Formation, northern Tabas Block

Depositional and thermal history of a continental, coal-bearing Middle Jurassic succession from Iran: Hojedk Formation, northern Tabas Block

Hygrochronometry of punctuated metasomatic events during exhumation of the Cycladic blueschist unit (Syros, Greece)

In situ Rb–Sr and 40Ar–39Ar dating of distinct mica generations in the exhumed subduction complex of the Western Alps

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