In addition, the zircon H 2 O of ~2.5 Ga TTGs in the TNCO displays a positive trend with increasing δ 18 O values, in contrast to the negative trends of the 2.5-Ga TTGs from the EB (fig.
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A two-stage mantle plume-sagduction origin of Archean continental crust revealed by water and oxygen isotopes of TTGs.
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