Which mechanism causes formation of placer deposits near oxbow lakes during fluvial transport?

💡 Explanation

When river flow decreases within oxbow lakes caused by meander cutoff, differential settling occurs because higher density materials like gold deposit rapidly while lighter sediments carried by water flow further. Therefore, denser placer deposits accumulate, rather than chemical precipitation, hydraulic plucking, or crystallization, which depend on different conditions.

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• Which risk greatly increases when excessive groundwater extraction collapses subterranean karst systems?
• Which phenomenon causes recurrent displacement during strike-slip fault movement in earthquake zones?