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In contrast, the riverbed sediments show different examples of rock enrichment in the process of weathering from bedrock to sediments without enrichment for Cr, Ni, Cu and Zn, but considerable enrichment for Cd, As and Pb. Cd exhibits the greatest environmental risk of all the heavy metals within the basaltic watersheds particularly in the Yungui region, and that can be primarily attributed to the high geological back ground values in this area. Comparative studies of some major basalt watershe