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GEOREF RECORD

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

Fereshteh Ranjbar Moghadam, Fariborz Masoudi, Fernando Corfu and 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 = Revue Canadienne des Sciences de la Terre (October 2018) 55 (10): 1173-1182

Abstract

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 + or - 1.1 Ma, whereas a spatially associated gabbro has an age of 471.1 + or - 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.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 55
Serial Issue: 10
Title: Ordovician mafic magmatism in an Ediacaran arc complex, Sibak, northeastern Iran; the eastern tip of the Rheic Ocean
Affiliation: Shahid Beheshti University, Faculty of Earth Sciences, Tehran, Iran
Pages: 1173-1182
Published: 201810
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 59
Accession Number: 2019-003588
Categories: Igneous and metamorphic petrologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N35°15'00" - N35°30'00", E60°00'00" - E60°15'00"
Secondary Affiliation: University of Oslo, NOR, NorwayFerdowsi University of Mashhad, IRN, Iran
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201902
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