The assembly of Gondwana in the Ediacaran was concluded by extensive arc magmatism along its northern margin. Extensional events in the early Paleozoic led to rifting and the eventual separation of terranes, which were later assimilated in different continents and orogens. The Sibak area of northeastern Iran records these events, including late Precambrian volcanic-sedimentary processes, metamorphism, and magmatism. A granite at Chahak in the Sibak Complex yields a zircon U–Pb age of 548.3 ± 1.1 Ma, whereas a spatially associated gabbro has an age of 471.1 ± 0.9 Ma. The latter corresponds to the earliest stages of rifting in the nearby Alborz domain, with the deposition of clastic sedimentary sequences, basaltic volcanism, and, as indicated by indirect evidence, coeval granitic plutonism. The Chahak gabbro is thus one of the earliest witnesses of the rifting processes that eventually led to the development of the Rheic Ocean and were indirectly linked to subduction of Iapetus at the Laurentian margin and the early development of the Appalachian orogen.
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Research Article|
July 16, 2018
Ordovician mafic magmatism in an Ediacaran arc complex, Sibak, northeastern Iran: the eastern tip of the Rheic Ocean
Fereshteh Ranjbar Moghadam
;
Fereshteh Ranjbar Moghadam
a
Faculty of Earth Sciences, Shahid Beheshti University, 19839-63113 Tehran, Iran.
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Fariborz Masoudi
;
Fariborz Masoudi
a
Faculty of Earth Sciences, Shahid Beheshti University, 19839-63113 Tehran, Iran.
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Fernando Corfu
;
b
Department of Geosciences and CEED, University of Oslo, 0316 Oslo, Norway.Corresponding author: Fernando Corfu (email: fernando.corfu@geo.uio.no).
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Seyed Massoud Homam
Seyed Massoud Homam
c
Faculty of Science, Ferdowsi University of Mashhad, 91779-48974 Mashhad, Iran.
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Canadian Journal of Earth Sciences (2018) 55 (10): 1173–1182.
Article history
received:
21 Mar 2018
accepted:
02 Jun 2018
first online:
17 Oct 2018
Citation
Fereshteh Ranjbar Moghadam, Fariborz Masoudi, Fernando Corfu, Seyed Massoud Homam; Ordovician mafic magmatism in an Ediacaran arc complex, Sibak, northeastern Iran: the eastern tip of the Rheic Ocean. Canadian Journal of Earth Sciences 2018;; 55 (10): 1173–1182. doi: https://doi.org/10.1139/cjes-2018-0072
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Index Terms/Descriptors
- absolute age
- Asia
- Ediacaran
- gabbros
- granites
- igneous rocks
- Iran
- magmatism
- metamorphic rocks
- metapelite
- metasedimentary rocks
- Middle East
- Neoproterozoic
- Ordovician
- paleogeography
- Paleozoic
- petrography
- plutonic rocks
- Precambrian
- Proterozoic
- Rheic Ocean
- rifting
- U/Pb
- upper Precambrian
- Sibak Complex
- Chaka Granite
Latitude & Longitude
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