Alkali-rich intrusive rocks in western Yunnan were derived from an enriched lithospheric mantle (EMⅡ) source. The data available indicated they are alkali-rich
In natural systems heavy metals are present in very low concentrations (less than micro-molar), so precise measurement of the free metal ions is difficult. Rece
Zinc smelting near Magu Town, Hezhang County, Guizhou Province, resulted in vegetation destruction and the accumulation of heavy metals, to varying extent, in a