Ordovician mafic magmatism in an Ediacaran arc complex, Sibak, northeastern Iran: the eastern tip of the Rheic Ocean

Moghadam, Fereshteh Ranjbar; Masoudi, Fariborz; Corfú, Fernando; Homam, Seyed Massoud

doi:10.1139/cjes-2018-0072

Cited by 14 publications

(8 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…South of Fariman and west of Torbat Jam a series of basement units have been upthrust through the Cenozoic cover. These units include the Sibak Complex of Ediacaran metamorphic and intrusive rocks, locally cut by Ordovician gabbro (Ranjbar Moghadam et al 2018), in addition to fragments of Devonian, Permian and Triassic units. The locally extensive Cretaceous strata in this area represent the eastern extension of the Sabzevar ophiolitic sequences, which developed in an internal ocean basin opened in this period (Rossetti et al 2010;Shafaii Moghadam et al 2014).…”

Section: Geology Across the Paleotethys Suture South Of Mashhadmentioning

confidence: 99%

“…The paper documents the ages and the main compositional features of the distinct intrusions and discusses their regional tectonic significance in the context of the known tectonic framework. (1984), Ternet et al (1980), Alavi-Naini and Mossavi-Khorzughi (2006), Farbod et al (2011), Sheikholeslami and Kouhpeyma (2012), Zanchetta et al (2013), Javadi et al (2013), Zanchi et al (2016) and Ranjbar Moghadam et al (2018)…”

Section: Introductionmentioning

confidence: 99%

“…Early Paleozoic rifting detached ribbon terranes and opened the Rheic Ocean (e.g. Stampfli and Borel 2002;Bagheri and Stampfli 2008;Torsvik and Cocks 2013;Domeier 2018;Ranjbar Moghadam et al 2018). A subsequent stage of rifting in the Devonian caused deposition of clastic sediments and evaporites and was followed by marine sedimentation, gradually opening the Paleotethys (Bagheri and Stampfli 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The cross sections are not at scale and idealized to reflect the main relationships and structures in the region. The map and cross sections integrate information from de Gramont et al (1984), Ternet et al (1980), Alavi-Naini and Mossavi-Khorzughi (2006), Farbod et al (2011), Sheikholeslami and Kouhpeyma (2012), Zanchetta et al (2013), Javadi et al (2013), Zanchi et al (2016) and RanjbarMoghadam et al (2018)…”

mentioning

confidence: 99%

See 3 more Smart Citations

The composite Triassic–Eocene Poshteh pluton, eastern Iran, an Eo-Cimmerian element south of the main Paleotethys suture

Mahmoudi

Corfú

2022

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

The composite Poshteh Pluton, at the northeastern margin of the Central Iranian Microplate near Taybad in eastern Iran, is positioned at a critical tectonic junction, south of the inferred main Paleotethys suture and along the major regional Doruneh Fault system. It consists of two distinct intrusions. Quartz monzonite is dated in this study by zircon U–Pb ID-TIMS to 215.8 ± 0.5 Ma, an age that coincides with the time of closure of the Paleotethys during the late collisional stages of the Eo-Cimmerian Orogeny. It is geochemically very similar to coeval plutons present along and north of the Paleotethys suture, where they intruded Carboniferous-Permian arc sequences, ophiolites and flysch. The Poshteh quartz monzonite is located south of the suture in a position similar to the Anarak and related complexes further west, which previously have been interpreted as reflecting Mesozoic and Cenozoic disruption of the Eo-Cimmerian Orogen by extensional and transtensional processes. The Triassic quartz monzonite was subsequently invaded by granite at 41.23 ± 0.31 Ma. The emplacement was in part structurally controlled by the Doruneh Fault system and associated to hydrothermal alteration and Fe mineralization. The granite is thus a coeval member of a widespread late Eocene to Oligocene plutonic suite in the region, and likely the result of delamination and melting of the subcontinental lithosphere.

show abstract

Section: Geology Across the Paleotethys Suture South Of Mashhadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

The composite Triassic–Eocene Poshteh pluton, eastern Iran, an Eo-Cimmerian element south of the main Paleotethys suture

Mahmoudi

Corfú

2022

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

show abstract

“…The younger arc‐related granitic magmatism continued from 540 to 520 Ma due to crustal heating related to slab break‐off (e.g., Badr et al, 2018; Bendokht et al, 2021; Linnemann et al, 2010; Moghadam et al, 2017; Nouri et al, 2021; Shabanian et al, 2018). The magmatic products are usually felsic igneous plutons (e.g., north of Khoy—Azizi et al, 2011; Ghaleh‐Dezh orthogneiss—Shakerardakani et al, 2015; north Shahrekord metagranite—Badr et al, 2018; Azna‐Dorud metagranite—Shabanian et al, 2018), whereas most of the mafic igneous rocks are related to a back‐arc basin setting (e.g., north Shahrekord in SaSZ—Malek‐Mahmoudi et al, 2017; Sibak in northeastern Iran—Moghadam, Masoudi, Corfu, & Homam, 2018). In general, the arc and back arc‐related magmatism and magmatism related to the closure of back‐arc basins occurred from ~600 to 510 Ma, in response to subduction and partial consumption of the Proto‐Tethys oceanic basin (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Geochronology and geochemistry of the Ediacaran orthogneisses from the north Shahrekord (Sadegh‐Abad), Sanandaj‐Sirjan Zone: Insights into magmatic evolution of the Iranian basement

et al. 2022

View full text Add to dashboard Cite

The metamorphosed Sadegh‐Abad granite from the north Shahrekord Metamorphic Complex (NSMC) of Sanandaj‐Sirjan Zone in west Iran shows evidence of ductile deformation. The augen to banded mylonitic granite (orthogneiss) involves sharp contacts with other rock units, including high‐grade metamorphic rocks, such as eclogite, amphibolite, and garnet amphibolite as well as schists. U–Pb zircon dating reveals that the crystallization of the granitic magma occurred at 568 ± 14 Ma (Late Neoproterozoic, Ediacaran). The Sadegh‐Abad mylonitic granite comprises high SiO2 (67–78 wt.%) and Na2O (3.23–7.79 wt.%) contents and low CaO (0.73–1.61 wt.%) and variable K2O concentrations (0.08–4.6 wt.%). The chondrite‐normalized REE diagram shows enrichment in LREE relative to HREE (Ce/Yb)N = 1.90 to 6.12), a negative Eu anomaly (Eu/Eu* = 0.10–0.66), and nearly flat HREE patterns (Tb/Yb)N = 0.94–1.44). These are interpreted to have originated from a continental crustal source. This is further supported by the high concentration of the alkali elements, U, Th, Rb, and the high 87Sr/86Sr(i) isotopic ratios (0.7086 to 0.7163). The lower HREEs abundances, negative Eu anomalies, and the low contents of mafic minerals may infer that partial melting of continental crust has taken place in low‐pressure conditions within the plagioclase stability field, possibly of pre‐existing calc‐alkaline bodies in the lower continental crust. The charge of heating probably occurred via the injection of mafic magmas into the tonalitic and granodioritic continental crust.

show abstract

Geochemistry and geochronology of the Neyshabur meta-volcanic rocks, Binalood mountains, NE Iran: witnesses of Paleo-Tethys rifting and closure

Karimi,

Topuz,

Ratschbacher

et al. 2023

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Geochemical and geochronologic data are presented for meta-mafic to meta-felsic rocks along the Paleo-Tethys Suture in the Binalood Mountains east of Neyshabur, NE Iran. The rocks have a late Cambrian age (U–Pb zircon, ~ 490 Ma) and were metamorphosed in the Early Jurassic (40Ar/39Ar amphibole and plagioclase, 199–192 Ma). The rocks of this suite are alkaline and sub-alkaline (tholeiitic). The alkaline rocks are enriched in light relative to heavy rare earth elements, and do not show depletion of high-field strength elements on primitive mantle-normalized multi-element diagrams; they are similar to ocean island basalts (OIB). The tholeiitic rocks are depleted in Nb and Ta and have higher MgO and lower TiO2 than the alkaline rocks. Both types have similar, high and variable 87Sr/86Sr(i) isotopic compositions of 0.7044 to 0.7082 and 143Nd/144Nd(i) values of 0.5118 to 0.5122. The alkaline rocks are lower-degree partial melts than the tholeiitic rocks and were generated at greater depths; they likely originated from a garnet pyroxenite-rich source. The spatial, temporal, and geochemical relationships of early Paleozoic meta-mafic to felsic rocks along the Paleo-Tethys Suture (e.g., Shahrud, Jajarm, Binalood, Torbat-e-Jam) substantiate the role of a mantle plume in continental breakup along the northern margin of Gondwana and a late Cambrian-Ordovician onset of rifting that resulted in the opening of the Paleo-Tethys Ocean. The Early Jurassic metamorphism post-dates its closure. Graphical abstract

show abstract

Ordovician mafic magmatism in an Ediacaran arc complex, Sibak, northeastern Iran: the eastern tip of the Rheic Ocean

Cited by 14 publications

References 52 publications

The composite Triassic–Eocene Poshteh pluton, eastern Iran, an Eo-Cimmerian element south of the main Paleotethys suture

The composite Triassic–Eocene Poshteh pluton, eastern Iran, an Eo-Cimmerian element south of the main Paleotethys suture

Geochronology and geochemistry of the Ediacaran orthogneisses from the north Shahrekord (Sadegh‐Abad), Sanandaj‐Sirjan Zone: Insights into magmatic evolution of the Iranian basement

Geochemistry and geochronology of the Neyshabur meta-volcanic rocks, Binalood mountains, NE Iran: witnesses of Paleo-Tethys rifting and closure

Contact Info

Product

Resources

About