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Changes of Ge/Si, REE + Y and SmNd isotopes in alternating Fe- and Si-rich mesobands reveal source heterogeneity of the ~ 2.54 Ga Sijiaying banded iron formation in Eastern Hebei, China
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Changes of depositional environment of the BIF over relative short periods

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Silica was dominantly derived from weathering of continental landmasses.

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Iron had a hydrothermal origin.

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