Early Paleozoic tectonic reconstruction of Iran: tales from detrital zircon geochronology

Hadi Shafaii Moghadam, Xian-Hua Li, William L. Griffin, Robert J. Stern, Tonny B. Thomsen, Guido Meinhold, Reza Aharipour, Suzanne Y. O'Reilly

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In this study we use detrital zircons to probe the Early Paleozoic history of NE Iran and evaluate the link between sediment sources and Gondwanan pre-Cadomian, Cadomian and younger events. U–Pb zircon ages and Hf isotopic compositions are reported for detrital zircons from Ordovician and Early Devonian sedimentary rocks from NE Iran. These clastic rocks are dominated by zircons with major age populations at ~ 2.5 Ga, ~ 0.8–0.6 Ga, 0.5 Ga and ~ 0.5–0.4 Ga as well as a minor broad peak at ~ 1.0 Ga.

The source of 2.5 Ga detrital zircons is enigmatic; they may have been supplied from the Saharan Metacraton (or West African Craton) to the southwest or Afghanistan–Tarim to the east. The detrital zircons with age populations at 0.8–0.6 Ga probably originated from Cryogenian–Ediacaran juvenile igneous rocks of the Arabian–Nubian Shield; this inference is supported by their juvenile Hf isotopes, although some negative εHf (t) values suggest that other sources (such as the West African Craton) were also involved. The age peak at ca 0.5 Ga correlates with Cadomian magmatism reported from Iranian basement and elsewhere in north Gondwana. The variable εHf (t) values of Cadomian detrital zircons, resembling the εHf (t) values of zircons in magmatic Cadomian rocks from Iran and Taurides (Turkey), suggest an Andean-type margin and the involvement of reworked older crust in the generation of the magmatic rocks. The youngest age population at 0.5–0.4 Ga is interpreted to represent Gondwana rifting and the opening of Paleotethys, which probably started in Late Cambrian–Ordovician time. A combination of U–Pb dating and Hf-isotope data from Iran, Turkey and North Gondwana confirms that Iran and Turkey were parts of Gondwana at least until late Paleozoic time.

LanguageEnglish
Pages87-101
Number of pages15
JournalLithos
Volume268-271
DOIs
Publication statusPublished - Jan 2017

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Geochronology
tectonic reconstruction
Tectonics
geochronology
zircon
Paleozoic
Gondwana
Rocks
Isotopes
craton
Ordovician
isotope
Igneous rocks
Sedimentary rocks
Ediacaran
clastic rock
rock
igneous rock
rifting
magmatism

Keywords

  • Detrital zircon
  • Hf isotopes
  • Cadomian magmatism
  • Paleotethys
  • NE Iran

Cite this

Moghadam, Hadi Shafaii ; Li, Xian-Hua ; Griffin, William L. ; Stern, Robert J. ; Thomsen, Tonny B. ; Meinhold, Guido ; Aharipour, Reza ; O'Reilly, Suzanne Y. / Early Paleozoic tectonic reconstruction of Iran : tales from detrital zircon geochronology. In: Lithos. 2017 ; Vol. 268-271. pp. 87-101.
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Early Paleozoic tectonic reconstruction of Iran : tales from detrital zircon geochronology. / Moghadam, Hadi Shafaii; Li, Xian-Hua; Griffin, William L.; Stern, Robert J.; Thomsen, Tonny B.; Meinhold, Guido; Aharipour, Reza; O'Reilly, Suzanne Y.

In: Lithos, Vol. 268-271, 01.2017, p. 87-101.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Moghadam, Hadi Shafaii

AU - Li, Xian-Hua

AU - Griffin, William L.

AU - Stern, Robert J.

AU - Thomsen, Tonny B.

AU - Meinhold, Guido

AU - Aharipour, Reza

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