isotope group
6.By means of fuzzy cluster analysis on trace element geochemical ratios between Chencai Group in west Zhejiang, Sinian System and metamorphic rocks in Jiangxi, coupled with the Pb-Nd isotope geochemical features of amphibolites, it is identified that the central Jiangxi metamorphic belt closely corresponds to the Chencai Group and belongs to Cathaysian block.
8.The evidence of major and trace elements (including REE) as well as Sm Nd isotope of the rocks shows that there existed an early or earlier than Palaeoproterozic crust in western Hainan, and that the Baoban Group metasedimentary rocks partly originated from antiquity crust materials, and partly from new born crust with more mantle volcanic materials or was related with the largescale orogenic event and the tectonic magmatic activity following the addition of mantle materials.

