CORRELATION OF GEOCHEMICAL FEATURES AND GENESIS BETWEEN THE AMPHIBOLITES IN YIYANG AREA OF JIANGXI AND THOSE IN CHENCAI GROUP OF ZHEJIANG

Corresponding to the Chencai Group of Zhejiang, two types of amphibolite are recognizable in Yiyang of Jiangxi. Type I is an ortho-metamorphic rock derived from tholeiitic rock, while type II is a para-metamorphic rock resulted from metamorphism of dolomitic marl. Through correlation study of the primary rocks of amphibolites between these two places in chemical composition, trace elements, rare earths, isotopes and isotopic geochronology, the authors found that the primary rock of type I amphibolite in the Chencai Group of Zhejiang and in Yiyang, Jiangxi are oceanic tholeiite and island arc tholeiite respectively, suggesting that the primary rocks of type I amphibolites from these two places were formed in different tectonic environments, and that both of them have undergone the Jinningean, Caledonian and Indosinian tectonism.