PIXE analysis of nephrite minerals from different deposits

摘要

External-beam PIXE was used to determine the major, minor and trace elements of 45 nephrite minerals from 14 different deposits, including China and other countries. Depending on the R~+ value (mole percent of Mg~(2+)/(Mg~(2+) + Fe~(2+(3+)))) and content of Cr, Co and Ni, two types of nephrite minerals from dolomite and serpentinized ultramafic deposits can be more accurately distinguished. Besides, the nephrite minerals from Xiaomeiling and Wenchuan deposit can be distinguished with others from dolomite deposits, through the content of Sr and Mn/Fe value, respectively. Moreover, depending on the Sr content, clear evidence was given to prove that the raw materials of ancient nephrite artifacts from Liangzhu culture ruins are not from Xiaomeiling nephrite deposit. Furthermore, PIXE as a non-destructive method will be more used to study ancient nephrite artifacts, so these results can provide scientific basis for seeking the provenance of nephrite raw materials.