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Proterozoic mantle lithosphere beneath the extended margin of the South China block: In situ Re-Os evidence

¹ Australian Research Council National Key Centre for the Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia
² Australian Research Council National Key Centre for the Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia, and CSIRO Exploration and Mining, North Ryde, NSW 2113, Australia
³ Department of Geosciences, National Taiwan University, Taipei 106, Taiwan, Republic of China
⁴ Australian Research Council National Key Centre for the Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia

The Os isotope compositions of sulfides in mantle xenoliths from the Penghu Islands, Taiwan Strait, reveal the presence of Proterozoic subcontinental lithospheric mantle beneath the highly extended southeast margin of the South China block. Both T_RD (Re depleted) model ages for individual sulfides and model ages estimated from the initial ¹⁸⁷Os/¹⁸⁸Os ratios of Re-Os mixing lines require that some volumes of the subcontinental lithospheric mantle formed prior to 2.3–1.9 Ga. Later events in the subcontinental lithospheric mantle may be recorded by T_RD model ages of 1.5–1.2 Ga and ca. 0.9 Ga. The events recognized in the subcontinental lithospheric mantle are consistent with those known in the crust of the mainland South China block. The sulfide Os isotope data show that Proterozoic lithosphere beneath the South China block has survived the extensive Mesozoic Yanshanian magmatism on the continental margin and has not been delaminated even during the severe lithospheric extension that led to the subsidence of the Taiwan Strait.

Key Words: lithospheric mantle • Re-Os • sulfides • Taiwan Strait • Proterozoic • South China block

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