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The Mesozoic geology of SE China is characterized by intensive and widespread magmatism. However, the tectonic regime that accounted for the Mesozoic magmatism has been an issue with little consensus. A comprehensive study of 40Ar–39Ar dating, geochemistry and Sr–Nd isotopes has been conducted on basalts from southern Hunan and syenite intrusions from eastern Guangxi. Three episodes of Jurassic magmatism, i.e. alkaline basalts of c.175 Ma in age, syenitic intrusions of c.160 Ma and high-Mg basalts of c.150 Ma, are identified. The older, c.175 Ma alkaline basalts are characterized by low Sr (...

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