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U–Pb zircon dating for 10 rock samples collected from the Archean Jiaobei terrain of the eastern block of the North China craton (NCC) yield three groups of ages: ∼2.9Ga, ∼2.7Ga and ∼2.5Ga. Thirteen rock samples studied can be classified into a low Mg# (molecular Mg/(Mg+Fe)) (Mg#=34–52) and a high Mg# group (Mg#=52–61), respectively. The low Mg# rocks are typical Archean TTGs with emplacement ages...
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