Proto-Adamastor ocean crust (920 Ma) described in Brasiliano Orogen from coetaneous zircon and tourmaline.

• Autor(a) principal: Hartmann, Leo Afraneo
• Data de Publicação: 2018
• Outros Autores: Werle, Mariana, Michelin, Cassiana Roberta Lizzoni, Lana, Cristiano de Carvalho, Queiroga, Gláucia Nascimento, Castro, Marco Paulo de, Arena, Karine da Rosa
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UFOP
• Texto Completo: http://www.repositorio.ufop.br/handle/123456789/11198; https://doi.org/10.1016/j.gsf.2018.09.018
• topic: Coeval zircon and tourmaline; Bossoroca ophiolite; Early Brasiliano Orogen; Zircon trace elements

Proto-Adamastor ocean bathed Rodinia and successor continental fragments from 1.0e0.9 Ga up to 0.75 Ga, and evolved into world Adamastor Ocean at 0.75e0.60 Ga. Mesoproterozoic oceanic crust is poorly preserved on continents, only indirect evidence registered in Brasiliano Orogen. We report first evidence of ophiolite originated in proto-Adamastor. We use multi-technique U-Pb-Hf zircon and d11B tourmaline isotopic and elemental compositions. The host tourmalinite is enclosed in metaserpentinite, both belonging to the Bossoroca ophiolite. Zircon is 920 Ma-old, 3 Hf(920 Ma)¼þ12, HfTDM ¼ 1.0 Ga and has ‘oceanic’ composition (e.g., U/Yb < 0.1). Tourmaline is dravite with d11B ¼ þ1.8& (Tur 1), 0& (Tur 2), 8.5& (Tur 3). These characteristics are a novel contribution to Rodinia and associated world ocean, because a fragment of proto-Adamastor oceanic crust and mantle evolved at the beginning of the Brasiliano Orogen.