Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/40581
Title: Neoproterozoic to early Paleozoic crustal growth, recycling, and the changing geodynamics of North Gondwana
Author: Moghadam, Hadi Shafaii
Li, Qiu-Li
Griffin, William L.
Li, Xian-Hua
Karsli, Orhan
Spencer, Christopher J.
Santos, José F.
Kirschenbaur, Maria
Nasir, Sobhi
O’Reilly, Suzanne Y.
Keywords: Zircon
Crust reworking
Ediacaran magmatism
Paleotethys
Gondwana
Iran
Issue Date: 2024
Publisher: Elsevier
Abstract: Understanding crustal growth, reworking, and geodynamics of the northern continental margin of Gondwana during Ediacaran to Silurian times plays an important role in Gondwana's paleogeographic reconstruction. This study uses a combination of bulk-rock geochemistry, magmatic and detrital zircon geochronology, zircon trace element, and O-Hf isotope data to evaluate the Ediacaran-early Paleozoic magmatic history of northern Gondwana. Our detrital zircon data from Ediacaran to Ordovician sedimentary successions of central Iran show that the 620–500 Ma detrital zircon likely originates from the erosion of the Cadomian arcs in Iran and Anatolia. This zircon shows variable εHf(t) and δ18O values and Nb/Yb, U/Yb, and U/Nb, resembling arc rocks. The Cryogenian (1000–620 Ma) detrital zircon with juvenile εHf(t) and mantle-like δ18O values could have been supplied from erosion of the juvenile crust of the ANS. The youngest age peaks of 488–450 Ma for detrital zircon, in upper Cambrian-Ordovician sedimentary rocks, are considered to show the rifting of Gondwana and Paleotethys opening. Abundant unrounded 2.5 Ga detrital zircon from Ediacaran sandstones probably shows uplift and exhumation of a local source, i.e., the Archean crust of Iran. The Neoproterozoic igneous rocks formed firstly during the subduction of oceanic lithosphere (Mozambique Ocean) beneath northern Gondwana around 880 Ma to form the ANS juvenile crust. Later, the magmatism moved from the ANS toward the northern territories of Gondwana, with peak magmatism at 570–525 Ma. In Cambrian to Ordovician, the Cadomian magmatic arc was uplifted and eroded, and the geodynamic setting switched into juvenile magmatism following rifting of northern Gondwana.
Peer review: yes
URI: http://hdl.handle.net/10773/40581
DOI: 10.1016/j.gr.2023.09.006
ISSN: 1342-937X
Publisher Version: https://doi.org/10.1016/j.gr.2023.09.006
Appears in Collections:DGeo - Artigos

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