Proto-Adamastor ocean crust (920 Ma) described in Brasiliano Orogen from coetaneous zircon and tourmaline.
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2018
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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.
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Keywords
Coeval zircon and tourmaline, Bossoroca ophiolite, Early Brasiliano Orogen, Zircon trace elements
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: <https://www.sciencedirect.com/science/article/pii/S1674987118302354>. Acesso em: 08 fev. 2019.