Cadomian crust of Eastern Iran: evidence from the Tapeh Tagh granitic gneisses

Mollai, Habib; Dabiri, Rahim; Torshizian, Habib Allah; Pe‐Piper, Georgia; Wei, Wang

doi:10.1080/00206814.2019.1670100

Cited by 13 publications

(2 citation statements)

References 72 publications

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“…Cadomian basement in Alborz and Central Iran could be considered a potential source for the Padeha sandstones. Lithologies in this area include granitic to tonalitic orthogneissic rocks and associated metasediments (Moghadam et al, 2015, 2016; Mollai, Dabiri, Torshizian, Pe‐Piper, & Wang, 2019; Rossetti et al, 2015) – a possible source for detrital tourmaline and rutile in this study. Horton et al (2008) believed that part of the Early Palaeozoic sandstones represent first cycle detritus originated from Cadomian basement of Iran.…”

Section: Discussionmentioning

confidence: 73%

“…Cadomian basement in Alborz and Central Iran could be considered a potential source for the Padeha sandstones. Lithologies in this area include granitic to tonalitic orthogneissic rocks and associated metasediments (Moghadam et al, 2015(Moghadam et al, , 2016Mollai, Dabiri, Torshizian, Pe-Piper, & Wang, 2019;Rossetti et al, 2015) a possible source for detrital tourmaline and rutile in this study. Horton et al (2008) Secondly, most of the tourmaline and rutile grain shapes in the Padeha sandstones are not consistent with relatively short transport (Figure 6) and have an unambiguously recycled character (at least the second cycle), so they could be derived from pre-existing sediments.…”

Section: Provenance and Palaeogeographical Implicationsmentioning

confidence: 88%

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Tourmaline and rutile geochemistry in the Early–Middle Devonian sandstones of the Padeha Formation, Alborz Range, Northern Iran

et al. 2021

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The provenance of Devonian sandstones of the Padeha Formation (Fm.), Eastern Alborz in Iran, has been investigated by standard heavy‐mineral analysis and tourmaline and rutile geochemistry. Heavy‐mineral assemblage is dominated by the ultra‐stable tourmaline, zircon, and rutile, while unstable species are completely absent. The Padeha Fm. sandstones show a very high value of zircon‐tourmaline‐rutile index signalizing either strong weathering in source area(s) or their recycled origin in older Early Palaeozoic formations. Detrital tourmaline shows predominantly dravitic, lesser Mg‐foititic, and uvitic compositions and metasedimentary origin. Metapelitic source is also indicated by rutile geochemistry. Temperature estimates according to Zr‐in‐rutile thermometry show a wide range from 519 to 872°C and indicate the presence of low‐ to upper‐amphibolite and granulite facies metapelitic rocks. Based on chemical composition of detrital tourmaline and rutile, we inferred that the crystalline basement rocks of the Arabian–Nubian Shield were potential primary sources for the Padeha Fm. deposits. Shape of tourmaline and rutile as well as their microtexture surface features indicate long‐distance transport, storage, and recycled history.

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Section: Discussionmentioning

confidence: 73%

“…Cadomian basement in Alborz and Central Iran could be considered a potential source for the Padeha sandstones. Lithologies in this area include granitic to tonalitic orthogneissic rocks and associated metasediments (Moghadam et al, 2015(Moghadam et al, , 2016Mollai, Dabiri, Torshizian, Pe-Piper, & Wang, 2019;Rossetti et al, 2015) a possible source for detrital tourmaline and rutile in this study. Horton et al (2008) Secondly, most of the tourmaline and rutile grain shapes in the Padeha sandstones are not consistent with relatively short transport (Figure 6) and have an unambiguously recycled character (at least the second cycle), so they could be derived from pre-existing sediments.…”

Section: Provenance and Palaeogeographical Implicationsmentioning

confidence: 88%

Tourmaline and rutile geochemistry in the Early–Middle Devonian sandstones of the Padeha Formation, Alborz Range, Northern Iran

et al. 2021

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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

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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.

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Diagenetic history and provenance of Devonian terrestrial sandstones at the margin of Gondwana: Padeha Formation, Eastern Alborz, Iran

Poursoltani

Pe‐Piper

2020

Journal of Asian Earth Sciences

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Cadomian crust of Eastern Iran: evidence from the Tapeh Tagh granitic gneisses

Cited by 13 publications

References 72 publications

Tourmaline and rutile geochemistry in the Early–Middle Devonian sandstones of the Padeha Formation, Alborz Range, Northern Iran

Tourmaline and rutile geochemistry in the Early–Middle Devonian sandstones of the Padeha Formation, Alborz Range, Northern Iran

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

Diagenetic history and provenance of Devonian terrestrial sandstones at the margin of Gondwana: Padeha Formation, Eastern Alborz, Iran

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