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REE and trace metals in some GSJ granitoids reference samples were determined by means of inductively coupled argon plasma/optical emission spectrophotometer (ICP). Samples are dis soluted with a mixed acid solution of H2SO4+HClO4+HNO3+HF. The separation and precon centration of the REE and trace metals from 1g sample, and the conditions of the spectrometry follow Tagiri and Fujinawa's method. REE and trace metal analyses of JG-1 show that the H2SO4 dissolution method is much suitable for REE analyses of granitoids, but not good for Ba, Sc and Zr analyses. Comparing the results of the H2SO4 dissolution method with the non-H2SO4 method, it is concluded that the most important carrier of REE in granitoids and pelitic gneisses is REE minerals, such as monazite and xenotime. More than 50% of REE in granitoids is generally contained in REE minerals.

REE analysis by H2SO4 dissolution method on granitoids and pelitic gneisses - REE carrier in acidic rocks.