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New Tonian-Ediacaran zircon U-Pb ages and Hf isotopes from arc-related magmatism with adakite-like signatures in the Araçuaí-Ribeira Orogenic System (SE-Brazil): Implications for early Western Gondwana assembly
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DOI：10.1016/j.precamres.2026.108129.png)
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Abstract
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• AROS records Tonian and Cryogenian magmatic stages (Serra da Prata, Rio Negro) • Tonian (882–829 Ma) high-silica adakite-like show juvenile mantle isotopic signatures. • Cryogenian-Ediacaran (640–609 Ma) C-type adakite-like record crustal contamination. • Earliest records of subduction-related magmatism at the AROS. • Results link Western Gondwana amalgamation to recurrent subduction.
Keywords:
Adakite-like magmatism
Subduction zones
Tonian
Zircon U-Pb ages and Hf isotopes
Sm-Nd and Sr isotopes
Araçuaí-Ribeira Orogenic System
Western Gondwana assembly
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