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Title: Proto-Adamastor ocean crust (920 Ma) described in Brasiliano Orogen from coetaneous zircon and tourmaline.
Authors: Hartmann, Leo Afraneo
Werle, Mariana
Michelin, Cassiana Roberta Lizzoni
Lana, Cristiano de Carvalho
Queiroga, Gláucia Nascimento
Castro, Marco Paulo de
Arena, Karine da Rosa
Keywords: Coeval zircon and tourmaline
Bossoroca ophiolite
Early Brasiliano Orogen
Zircon trace elements
Issue Date: 2018
Citation: HARTMANN, L. A. et al. Proto-Adamastor ocean crust (920 Ma) described in Brasiliano Orogen from coetaneous zircon and tourmaline. Geoscience Frontiers, v. 1, p. 1-21, 2018. Disponível em: <>. Acesso em: 08 fev. 2019.
Abstract: 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.
ISSN: 1674-9871
metadata.dc.rights.license: This is an open access article under the CC BY-NC-ND license ( licenses/by-nc-nd/4.0/). Fonte: o próprio artigo
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