Study on trace element geochemistry of Dushan jade from Nanyang area of Henan Provice by NAA

The geochemical features of different types of Dushan jade are differentiated based on trace element and REE geochemistry using neutron activation analysis (NAA). For white, green and black Dushan jade, the ∑REE values are 1.45, 6.895 and 3.867μg/g respectively; La/Yb 14.277, 4.936 and 0.849; Sr contents 754, 434 and 115μg/g; Cr contents 5.53, 1095 and 851μg/g; Fe contents 2777, 2838 and 28750μg/g; Mn contents 68, 65.5 and 532μg/g, separately. There is the highest positive Eu abnormity in the green Dushan jade and the lowest positive Eu abnormity in the black Dushan jade. These characteristics are of important significance for both deep study and discrimination on ancient jade.