However there are only four major groups in young growth generation, hydrogenetic (Mn, Co, Ni), rare earth elements (except Ce), carbonate fluorapalite (CaCO_3, P_2O_5), biogenic (Zn, Cu) groups.

• 稀土元素(Ce除外); (3)磷灰石组分(CaCO_3、P_2O_5);