Origin of seleniferous cherts in Yutangba Se deposit, southwest Enshi, Hubei Province

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At the top of the Lower Permian Maokou Formation limestones are developed carbonaceous cherts (Plm3), which constitute the dominant seleniferous layer of the Yutangba Se deposit. The cherts contain as much Se as 1646×10-6 on average. In addition, the
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