摘要
In the Dengxiangying Group,there are a large number of mafic dyke swarms,indicating an important tectonic-magmatic event during the Neoproterozoic period on the west margin of Yangtze Block in China. Combined with the regional geological data,the authors consider that the Neoproterozoic(~770 Ma B.P.) mafic dyke formed in the intra-plate extensional environment after Jinning orogeny on the west margin of Yangtze Block,sourced from the depleted asthenosphere mantle(DM),and contaminated by the crustal materials when the mantle upwell.This process is synchronous with the breakup of Rodinia supercontinent.