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The Xinxu bauxite orebodies, which are contained in Quaternary depressions overlying strata of Permian to Devonian age, were formed through the break-up, oxidation and re-sedimentation of a pre-existing Permian bauxite horizon. With progressive karsitification, the underlying strata of the Quaternary orebodies were eroded out downwards in sequence, gradually transiting from Permian to Devonian. Thus...
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