Abstract:The Precambrian crystalline basement of the Jiaonan orogenic belt is composed of metamorphosed strata of the late Archean Jiaodong group, the Palaeo-proterozoic Jinshan and Fenzishan groups,the Meso-proterozoic Haishou group,and pengheshi formation of the Neo-proterozoic Sinian period, and the Palaeo-Proterozoic ultramafic rocks, ma fie rocks, eclogites, the Neo-proterozoic granites and eclogites. These rocks record the evolution history of the orogenic belt: during 2900~2800Ma,intermediate-basic volcanic s...