On the mechanism of alluvial placers formation in watercourses draining local structures

Abstract

The paper considers the mechanism of alluvial placers formation, which are located in buried valleys on a structures wings. The metal particles accumulation in placer is mostly controlled by differences in the channel process upstream and downstream of the growing structure, the channel within the limits of the structure itself is distinguished by a chord-like profile, typical for growing structures. The rate of structures wings uplift determines also the preservation of metal-bearing layers formed in the past at different stages of the reliefs evolution.